In oil and gas production it is sometimes desirable to drill a new hole from the side of an existing well. Typically this is effected by expanding an inflatable packer at the desired depth and lowering a whipstock mounted on an anchoring apparatus down the well on coiled tubing. When the anchoring apparatus is immedia¬ tely above the anchor the orientation of the whipstock is checked using gyroscopic instruments mounted above the whipstock. The orientation of the whipstock may then be adjusted using the coiled tubing. Finally, the whipstock is dropped onto the anchor which causes the anchoring apparatus to set, i.e. to lock the anchoring apparatus in the casing. The whipstock is then used to guide milling tools to cut a window in the casing after which the new hole can be drilled.

In practice it is extremely difficult to orientate the whipstock properly, satisfactory results often only being achieved with highly experienced staff. Even then, some whipstocks are not properly orientated with the result that the new hole is not drilled in the desired direction.

Our investigations have revealed that there are two main reasons for holes which do not extend in the de¬ sired direction, viz: incorrect initial positioning of the whipstock and insufficient anchoring of the

whipstock resulting in it being displaced slightly during subsequent milling operations.

The present invention aims to help reduce these problems.

* * *

According to a first aspect the present invention provides an anchoring apparatus for use in a casing in a wellbore, said anchoring apparatus comprising a first body member, and a second body member so arranged that when said first body member moves relative to said second body member in one sense in a casing at least one of said first body member and said second body member is displaced sideways to contact the wall of said casing thereby wedging said anchoring apparatus in place.

Preferably, said first body member and said second body member are tapered at an angle of from 1° to 10°, preferably 1° to 5°, advantageously 1.75°. Advantageously, said anchoring apparatus includes a link connecting said first body member to said second body member.

Preferably, said link comprises a connecting bar disposed partially in a groove in said first body member and partially in a groove in said second body member.

Advantageously, said connecting bar is slidably mounted in both said groove in said first body member and said groove in second body member.

Preferably, said anchoring apparatus further cora- prises at least one pawl which is mounted on said connecting bar and which urges said first body member and said second body member apart when they are dis¬ placed relative to one another in the opposite sense.

Advantageously, said pawl has ends each of which are provided with teeth to engage said first body member

and said second body member respectively.

Preferably, at least one of said first body member and said second body member is provided with a toothed step for engaging said casing. Advantageously, said anchoring apparatus includes a receptacle connected to the first body member for accom¬ modating a male member extending upwardly from an an¬ chor.

Preferably, said anchoring apparatus includes flexing means connecting said first body member to said receptacle.

Advantageously, said flexing means has a neck area.

Preferably, said flexing means comprises a tube having at least one notch therein.

* * *

According to a second aspect the present invention provides a receptacle for accommodating a male member extending upwardly from an anchor, said receptacle com¬ prising a hollow body member having a top and a bottom, a lower alignment assembly releasably retained in the lower portion of said hollow body member, said lower alignment assembly having a channel therethrough for releasably retaining said male member, the arrangement being such that as said receptacle is lowered onto said male member said male member enters said channel and said male member and said lower alignment assembly subsequently move along said hollow body member. Preferably, said receptacle includes a locking assembly having a channel for receiving and holding said male member as said male member and said lower alignment assembly move along said hollow body member.

Advantageously, said hollow body member has a nose having two opposed curved nose surfaces for contacting a

guide key on said male member, and a guide slot so arranged that as said receptacle is lowered onto said male member one of said opposed curved nose surfaces engages said guide key and causes said receptacle to rotate on said male member until said guide key is aligned with said guide slot whereafter said receptacle moves downwardly and said guide key moves along said guide slot.

Preferably, said hollow body member has a lower internal groove and said lower alignment assembly has a plurality of detents which enter said lower internal groove and resist displacement of said lower alignment member relative to said hollow body member.

Advantageously, said hollow body member has a slot, and said lower alignment assembly has a member which extends into said slot, movement of said lower alignment assembly relative to said hollow body member being limited by engagement of said member with the ends of said slot. Preferably, said lower alignment assembly includes a tapered lip for guiding said male member into said channel.

Advantageously, said lower alignment assembly has a split locking ring with two-way threads for permitting said receptacle to rotate about said male member and said male member to be inserted and withdrawn from said channel.

Preferably, said locking assembly has a split interiorly threaded locking ring with one way threads which permit insertion of said male member into said locking assembly but which prevent withdrawal therefrom.

Advantageously, said hollow body member has at least one exit port for the passage of fluid there¬ through.

* *

According to a third aspect the present invention provides an anchor for use in casing in a wellbore, said anchor comprising a male member having a guide key formed integrally with or mounted on said male member and having a leading face for engaging and guiding a receptacle onto said anchor, characterised in that said leading face is generally of pointed arch shape.

* * *

According to a fourth aspect the present invention provides an indicator device for indicating correct orientation of an anchoring apparatus on a male member of an anchor, which indicator device comprises a rod which, when said anchoring apparatus is correctly orien¬ tated on said anchor is displaced to a position indica¬ tive of said correct orientation. Preferably, said indicator device includes means to prevent setting of said anchoring apparatus, and where¬ in, in use, said rod displaces said means thereby enab¬ ling setting of said anchoring apparatus when said anchoring apparatus is correctly orientated on said anchor.

Advantageously, said rod comprises at least two sub-rods which are operatively connected to one another.

* * *

According to a fifth aspect the present invention provides a toggling connection for connecting a whip¬ stock to an anchoring apparatus, said toggling connec¬ tion comprising a first connecting member having a top end and a bottom end, a slot, and a recess below the

slot, said recess opening at the bottom end of said first connecting member, the slot having a top edge and a bottom edge and the recess opening having a top edge, a second connecting member movably connected to the first connecting member and having a first hole there¬ through and a second hole therethrough, the second connecting member's top end disposed within the first connecting member's bottom end with the first connecting member's slot aligned with the second connecting member's first hole and a first pin securing the two connecting members together, the first pin extending through the slot and through the first hole of the second connecting member, the first pin movable in the slot, a second pin passing through the recess opening of the first connecting member and through the second hole of the second connecting member, the two connecting members initially connected so that a force on the first connecting member directed toward the second connecting member urges the top edge of the slot against the first pin and the top edge of the recess against the second pin thereby transmitting the force to the second connecting member, and a force on the first connecting member pulling it away from the second connecting member effecting abutment of the first pin against the bottom edge of the slot and movement of the second pin out of the recess, permitting the first connecting member to pivot about the first pin.

Preferably, said toggling connection further com- prises a shear pin extending into and between the two connecting members and inhibiting relative movement therebetween until sufficient force is applied to the connection to shear said shear pin.

* * *

According to a sixth aspect the present invention pro¬ vides an installation tool for installing an anchoring apparatus in accordance with the invention, said instal¬ lation tool comprising an upper housing, a mandrel rotatably mounted in said upper housing, and a lower housing secured to the mandrel, the arrangement being such that, in use, tensile and compressive forces ap¬ plied to the upper housing can be transmitted to an anchoring apparatus connected directly or indirectly to said lower housing.

Preferably, said installation tool includes a thrust bearing between the upper housing and said man¬ drel.

* * *

According to a seventh aspect the present invention provides a tool for use in a wellbore, said tool having a support assembly comprising a pin, means biasing said pin to an operative position, means retaining said pin in an inoperative position, and means for inhibiting said pin returning towards said inoperative position after it has been displaced towards said operative position. Preferably, said tool includes a support pad moun¬ ted on one end of said pin for engaging the wall of casing.

Advantageously, said pin has exterior one-way threads and said means for inhibiting said pin returning towards said inoperative position comprises a split lock ring with interior one-way threads.

* * *

According to an eighth aspect the present invention

provides in or for use in a casing in a wellbore a device comprising one or more of the following: a) an anchoring apparatus in accordance with the present invention; b) a receptacle in accordance with the present inven¬ tion; c) an anchor in accordance with the present invention; d) an indicator device in accordance with the present invention; e) a toggling connection in accordance with the pre¬ sent invention; f) an installation tool in accordance with the present invention; g) a tool in accordance with the present invention; and h) a whipstock.

In one embodiment the device includes an installa¬ tion tool and a whipstock, wherein said whipstock is attached to said installation tool by a shear bolt and said installation tool is provided with a shoulder which engages said whipstock so that, in use, downward forces on said installation tool are transmitted to said whip¬ stock via said shoulder whilst upward forces act on said shear bolt.

* * *

A ninth aspect of the present invention provides a milling tool comprising a tool body with a milling head and central bore through the tool body for fluid flow, the milling head having an outer circumferential said surface, a lower bottom surface, and a lower corner surface between the outer circumferential said surface and the lower bottom surface, a plurality of milling elements on the outer circumferential side surface, at

least one fluid flow channel in fluid communication with the central bore of the tool the at least one fluid flow channel having an exit opening at the lower corner of the milling head.

* * *

A tenth aspect of the present invention provides a milling tool comprising a tool body with a top and a bottom with a milling head at the bottom and a bore through the tool body for fluid flow, the milling head having an outer circumferential side surface and a lower bottom surface, a plurality of milling elements on the outer circumferential side surface, at least one fluid flow channel in fluid communication with the central bore of the tool, the at least one fluid flow channel having an exit opening on the lower bottom surface of the milling head, and a flow director secured to the bottom of the lower milling head, the flow director having a body and an upturned lip to direct fluid flow¬ ing from the exit opening up toward the milling ele¬ ments.

* * *

An eleventh aspect of the present invention pro¬ vides a flow director for directing a flow of circula¬ ting fluid flowing down through a bore of a milling tool and out through at least one fluid port having an exit opening at a bottom of the milling tool, the milling tool having milling elements on a circumferential side surface of the milling tool, the flow director compris¬ ing a body, and a flow directing chamber in the body corresponding to the or each of the exit opening for receiving fluid flow from the exit opening, the flow

directing chamber shaped to direct said fluid flow upwardly to the milling elements.

For a better understanding of the present invention reference will now be made, by way of example, to the accompanying drawings, in which:-

Fig. 1 is a side view, partly in cross-section, of one embodiment of a device according to the present invention;

Fig. 2 is a side cross-sectional view, to an en¬ larged scale, of a first part of the device shown in Figure 1; Fig. 3 is a side cross-sectional view, to an en¬ larged scale, of a second part of the device shown in Figure 1;

Fig. 4 is a side cross-sectional view, to an en¬ larged scale, of a third part of the device shown in Figure 1;

Fig. 5A is a side cross-sectional view of a recep¬ tacle forming part of the device shown in Figure 1;

Fig. 5B is a front view of the receptacle of Figure 5A; Fig. 6A is a cross-sectional view through the notch of the tube of Figure 6B;

Fig. 6B is a side cross-sectional view, to an enlarged scale, of a tube forming part of the device shown in Figure 1; Fig. 7 is a is a side cross-sectional view, to an enlarged scale, of an adapter forming part of the device shown in Figure 1;

Fig. 8 is side cross-sectional view, to an en¬ larged scale, of a splined flexion member forming part of the device shown in Figure 1;

Fig. 9A is a side view, to an enlarged scale, of a connecting bar forming part of the device shown in Figure 1;

Fig. 9B is another side view of the connecting bar of Fig. 9A with the pawls removed;

Fig. 9C is a cross-sectional view of the connecting bar of Figure 9B;

Fig. 10A is a perspective view, to an enlarged scale, of a friction member forming part of the device of Figure 1;

Fig. 10B is a top plan view of the friction member of Figure 10A;

Fig. 11A is a side view, to an enlarged scale, of an upper body member of the device of Figure 1. Fig. 11B is another side view of the upper body member of Figure 11A;

Fig. 11C is another side view of the upper body member of Figure 11A;

Fig. 11D is a cross-sectional view along line D-D of Figure 11B;

Fig. HE is a bottom plan view of the upper body member of Figure 11B;

Fig. 11F is a cross-sectional view along line F-F of Figure 11B; Fig. 12A is a side view of a lower body member of the device of Figure 1;

Fig. 12B is another side view of the member of Figure 12A;

Fig. 12C is another side view of the member of Figure 12A;

Fig. 12D is a cross-sectional view along line A-A of Figure 12B;

Fig. 12E is a cross-sectional view along line B-B of Figure 12B; Fig. 12F is a cross-sectional view along line C-C of Figure 12B;

Fig. 13A is a cross-sectional view along line G-G of Figure 3 with the connecting bar omitted;

Fig. 13B is a cross-sectional view of the tool of Figure 3 with upper and lower body members in contact

with a casing;

Figs. 14A - 14C are side schematic views of a second embodiment of a device according to the present invention; Fig. 14D is a cross-sectional view along line H-H of Figure 14A;

Fig. 15 is a side schematic view of a third embodi¬ ment of a device according to the present invention;

Fig. 16 is a partial side view of a toggling con- nection according to the present invention;

Fig. 17 is a side view of a receptacle according to the present invention;

Fig. 18 is a cross-sectional view of the receptacle of Figure 17; Fig. 19A - 19F are side cross-sectional views of parts of the receptacle of Figure 17;

Fig. 19G is an enlargement of a split lock ring shown in Figure 19E;

Fig. 20 is a front view of a portion of the recep- tacle of Figure 17;

Fig. 21 is a side cross-sectional view of the portion of the receptacle shown in Figure 20;

Fig. 22 is a side cross-sectional view of a lower alignment assembly accommodated in the receptacle of Figure 17;

Fig. 23 is a side cross-sectional view of a lock ring used in the lower alignment assembly of Figure 22;

Fig. 24 is a side cross-sectional view of a lower guide used in the lower alignment assembly of Figure 22; Fig. 25 is a side view, partially in cross-section, of the lower alignment assembly of Figure 22;

Fig. 26 is a partial cross-sectional view of the assembly of Figure 25 through a ring of detents therein;

Fig. 27 is a side cross-sectional view of one of the detents of the assembly of Figure 26;

Fig. 28 is an enlargement of the lock ring of Figure 23 showing two-way locking/releasing threads on an interior thereof;

Figs. 29 - 34 are side cross-sectional view showing one method of operation of a device according to the present invention;

Fig. 35A is a side view of one embodiment of an anchor according to the present invention;

Fig. 35B is a view of the side of the anchor oppo- site the side shown in Figure 35A;

Fig. 35C is a top plan view of the anchor of Figure 35A;

Fig. 35D is a bottom plan view of the anchor of Figure 35A; Fig. 36A is a perspective view of one embodiment of a guide key forming part of an anchor according to the present invention;

Fig. 36B is a top plan view of the guide key of Figure 36A; Fig. 36C is a side view of the guide key of Figure 36A (the other side being a mirror image of this side);

Fig. 36D is a front end view of the guide key of Figure 36A;

Fig. 36E is a back end view of the guide key of Figure 36A;

Fig. 36F is a bottom view of the guide key of Figure 36A;

Fig. 37A is a perspective view of another embodi¬ ment of a guide key forming part of an anchor according to the present invention;

Fig. 37B is a top plan view of the guide key of Figure 37A;

Fig. 37C is a side view of the guide key of Figure 37A (the other side being a mirror image of this side); Fig. 37D is a front end view of the guide key of

Figure 37A;

Fig. 37E is a back end view of the guide key of Figure 37A;

Fig. 37F is a bottom plan view of the guide key of Figure 37A;

Fig. 38 is a cross-sectional view of one embodiment of a support device according to the present invention installed in a whipstock disposed in casing;

Fig. 39 is a cross-sectional view, on an enlarged scale, of the support device in the whipstock;

Fig. 40 is an exploded top cross-sectional view of the whipstock and support device of Figure 39;

Fig. 41 is a top cross-sectional view of the cas¬ ing, whipstock, and support device of Figure 38; Fig. 42 is a top cross-sectional view of a second embodiment of a support device according to the present invention installed in a whipstock in a casing;

Fig. 43 is an exploded top cross-sectional view of the support device of Figure 42; Fig. 44 is a top cross-sectional view of a whip¬ stock according to the present invention in casing;

Fig. 45 is a side cross-sectional view of a whip¬ stock with a third embodiment of a support device ac¬ cording to the present invention; Figs 46 and 47 show steps in the operation of the support device of Figure 45;

Fig. 48 is a top plan view of the whipstock of Figure 45;

Fig. 49A is a side view of a second embodiment of an anchor according to the present invention;

Fig. 49B is a view of the side of the anchor oppo¬ site the side shown in Figure 49A;

Fig. 49C ia a top plan view of the anchor of Figure 49A; Fig. 49D is a bottom plan view of the anchor of

Figure 49 A;

Fig 50A is a side view of one embodiment of a survey tool assembly according to the present invention;

Fig. 50B is a side cross-sectional view, partially schematic, of the survey tool assembly of Figure 50A;

Fig. 51 is a side cross-sectional view, partially schematic, of a second embodiment of a survey tool assembly according to the present invention;

Fig. 52A is a side cross-sectional view of a split lock ring;

Fig. 52B is a top view of the split lock ring of Figure 52A;

Fig. 52C is a bottom view of the split lock ring of Figure 52A; Fig. 52D is a side view of the split lock ring of Figure 52A;

Fig. 52E is a view of the other side of the split lock ring of Figure 52A which is opposite the side shown in Figure 52D; Figs. 53A - D show a side view in cross-section of a device according to the present invention;

Figs. 54A - C show the device of Figure 53A set in a casing;

Fig. 55 is a side view in cross-section of an enlargement of a connecting bar of the system of Fig. 53A with upper and lower body members associated there¬ with;

Fig. 56 shows a position of the items of Figure 55 after setting; Fig. 57 is a side view in cross-section of an installation tool of the device of Figure 53A and its interconnection with a top of a whipstock on the upper body member of the system of Figure 53A. Also shown in a top portion of connection apparatus interconnected between a top of the whipstock and a support assembly

(see Figure 58) located lower on the upper body member;

Fig. 58 shows a side view in cross-section of a support assembly of the system of Figure 53A and the lower part of the connection apparatus of Figure 57; Fig. 59 shows a side view in cross-section of a receptacle and associated apparatus of the system of Figure 53A;

Fig. 60 shows a side view in cross-section of the apparatus of Figure 59 after setting; Fig. 61 is a perspective exploded view of a movable block, and upper and lower body members of the device of Figure 53A;

Fig. 62 is an exploded side view showing a top rod and a middle rod of the system of Figure 53A and other related structures;

Fig. 63 is a side view of a connecting bar;

Fig. 64 is an end view of a movable block of Figure 61;

Fig. 65 is a cross-sectional view of slips, lower body, and top rod of the system of Figure 53A;

Fig. 66A is a side view of a prior art milling tool;

Fig. 66B is a bottom plan view of the tool of Figure 66A; Fig. 67 is a side view of a milling tool according to the present invention with a bottom flow director in cross-section;

Fig. 68A is a side view of a milling tool according to the present invention; Fig. 68B is a bottom end view of the milling tool of Figure 68A;

Fig. 69 is a top plan view of the flow director of the milling tool of Figure 67; and

Fig. 70 is a side view of a milling tool according to the present invention.

Referring now to Fig. 1, a device 10 according to the present invention has a receptacle 12 to which is secured a flexion member 14 by set screws 32. A locking nut 30 secures the top of the flexion member 14 to an adapter 28. The adapter 28 is welded to a tube 16 which itself is welded to a lower end of a lower body member 18 of an anchoring apparatus. A connecting bar 15 interconnects the lower body member 18 and an upper body member 20. A whipstock 22 is secured to a top of the upper body member 20. An installation tool 24 is re¬ leasably secured to a top of the whipstock 22.

As shown in Fig. 1, the device 10 has been inserted on a string S which typically includes ( from the instal¬ lation tool 24 up) a crossover sub, a drill collar (for weight), a connector to the drill collar, and a length of coiled tubing which extends to the surface.

A tubular T extends through casing C and the casing C extends downwardly below the tubular T.

The receptacle 12 has a key slot 34 for receiving a guide key 36 on a male member of an anchor 26 previously emplaced in the casing C, thus correctly orienting the device 10 in a desired orientation with respect to the casing C and therefore with respect to a wellbore (not shown) in which the casing C is installed. Sideways movement of the lower body member 18 is permitted and facilitated by two items: the flexion member 14 and the tube 16 so that the lower body member 18 can move sideways as desired against the wall of the casing C. The flexion member 14 has a neck 38 of re- duced size as compared to the size of the body 40 of the flexion member 14. The flexion member 14 (in one embo¬ diment made from steel) flexes at the neck 38. The tube 16 has one (or more) notches 42 cut therethrough which permit the tube 16 to bend to a small degree. As shown in Fig. 6A the notch 42 occupies half of the circumfer-

ence of the tube 16. Four centralizing bow springs 44 (three visible in Fig. 1) are disposed on the tube 16.

Fig. 4 illustrates the installation tool 24 in greater detail. The installation tool 24 has a lower housing 52 with a sleeve 54 and a block 56. The block 56 is secured to the whipstock 22 with a shear bolt 55. A mandrel 58 is threadedly engaged within the sleeve 54 and a set screw 57 prevents rotation of the mandrel 58 in the sleeve 54. The mandrel 58 is rotatable within an upper housing 62. The upper housing 62 threadedly en¬ gages a sub 64. The sub 64 interconnects the installa¬ tion tool 24 to connectors and to coiled tubing extend¬ ing to the surface. The mandrel 58 has a flange 66 which abuts an interior shoulder 68 of the upper housing 62. Brass sleeve bearings 72 facilitate rotation of the mandrel 58. A thrust bearing 74 serves to facilitate rotation of the mandrel 58 with respect to the sub 64 when downward force is applied to the sub 64. The shear bolt 55 does not experience a downward force when the device is being run into the hole since the bottom surface of the sleeve 54 abuts the top surface of the whipstock 22. The shear bolt 55 shears when the instal¬ lation tool 24 is raised after the whipstock 22 has been anchored as will be explained hereinafter. Figs. 5A and 5B show the receptacle 12. It has a key slot 34 for receiving the guide key 36 on the anchor 26. Material and debris entering the receptacle 12 through channel 78 exit through ports 82. Set screws 32 hold the receptacle 12 on the lower end of the flexion member 14.

As shown in Figs. 7 and 8, external splines 86 on the upper end of the flexion member 14 mate with inter¬ nal spline recesses 88 in the adapter 28. Prior to engagement the flexion member 14 (or alternatively the adapter 28 ) can be rotated to achieve a desired orienta-

tion of the receptacle 12 with respect to the adapter 28 and hence with respect to the rest of the device. When the desired position is achieved, the flexion member 14 is inserted into the adapter 28 and the locking nut 30 is tightened on the adapter 28. Further rotation of the receptacle 12 can be achieved by rotating the entire device 10 at the mandrel 58 - upper housing 62 interface of the installation tool 24. This can be done above the surface prior to insertion of the device 10 into the tubular T.

The lower body member 18, shown in Figs. 1 and 12A - 12F, has one or more recesses 92 in which are mounted friction members 94 (see Fig. 10A). As shown, the lower body member 18 tapers from top to bottom having a taper surface 93 which makes an angle of 1.75° with respect to the longitudinal axes of the device 10 and a T-shaped groove 96 along its length which holds the connecting bar 15 and guides the movement of the connecting bar 15. A slot 98 in each recess 92 facilitates emplacement of rear ribs 142 of the friction members 94; and screws which extend through holes 91 in the friction members 94 and into holes 95 in the lower body member 18 and hold the friction members 94 in place. Holes 97 at the top of the lower body member 18 receive shear members for interconnecting the connecting bar 15 and the upper body member 20.

The upper body member 20, shown in Figs. 1 and Figs. HA - 11F, tapers from bottom to top and has a taper surface 102 corresponding to the taper surface 93 of the lower body member 18. Thus as the upper body member 20 moves downwardly with respect to the lower body member 18, the diameter of the anchoring apparatus increases. A T-shaped groove 104 extends along the length of the upper body member 20 in which is held and in which moves a portion of the connecting bar 15.

Shear pins 106 extend through holes 108 in the lower part of the upper body member 20, through the connecting bar 15 and into the holes 97 in the upper part of the lower body member 18. The whipstock 22 is pinned to the upper body member 20 with a connecting pin 114 that extends through holes in the whipstock 22 and holes in the upper body member 20.

Figs. 1, and 9A - 9C show the connecting bar 15. The connecting bar 15 has a multiplicity of pawls 118 each pinioned with a centre pin 122 within slots 124 in the connecting bar 15. Springs 126 are partially dis¬ posed in spring recesses 127 in the pawls 118. Each spring 126 is biased against an adjacent pawl 118 or an adjacent edge 128 to ensure that all the pawls in a series of pawls remain in contact and move together. Edges 128 of each slot 124 acts as a panel stop to limit counterclockwise (as viewed in Fig. 9A) rotation of the pawls 118.

While the device 10 is run into the casing C, the upper and lower body members 18 and 20 are pinned toge¬ ther with the connecting bar 15 pinned between them by the shear pin 106. The shear pin 106 extends through hole 108 in the upper body member 20 and hole 97 in the lower body member 18. When the pin 106 holding the upper and lower body members 18, 20 is sheared and relative movement is permitted between the upper and lower body members 18, 20, the connecting bar 15 guides and controls this movement. As the movement commences, the pawls 118 rest in the slots 124. However, if an upward force is applied to the device 10, pulling the upper body member 20 upwardly, the pawls 118 pivot so that toothed surfaces 132 on one side of some of the pawls engage the lower body member 18 and toothed sur¬ faces 134 on the other side of some of the pawls engage the upper body member 20 (some of the pawls in the

middle engaging both body members) thereby inhibiting upward movement of the upper body member 20 with respect to the lower body member 18. Movement of the middle pawls contacting both body members also forces the lower and upper body members 18, 20 apart. This renders the device 10 effectively anchored in the casing C with the lower body member 18 and the upper body member 20 in contact with the interior surface of the casing C. As shown in Fig. 9C, the ends of the pawls 118 protrude slightly from the bar 15 upon rotation of the pawls 118 in response to an upward force so that the pawls ' toothed surfaces 132, 134 can engage the upper and/or lower body members 18, 20.

In operation the device 10 is inserted into and through tubular T which extends into casing C in a wellbore. The device 10 is at the end of a string S as previously described and descends through the tubular T exiting the tubular T and entering the casing C. The device 10 is lowered to a desired point in the casing where the receptacle 12 encounters the anchor 26. The device 10 is oriented correctly with respect to the anchor's key. Then "pushing down" on the device 10 shears the shear pin 106 (e.g. at 900kg. f (2000 pounds force)) freeing the upper and lower body members 18, 20 for relative movement. ("Pushing down" usually merely involves slackening the coil tubing supporting the device 10 so that the weight of the string S is applied to the upper body member 20. ) As the upper body member 20 moves downwardly with respect to the lower body member 18, a pin 115 partially disposed in a hole 136, has a protruding portion which moves into contact with a top of the connecting bar 15. The upper body member 20 moving downwardly thus begins to force the connecting bar 15 downwardly. Once the connecting bar 15 reaches a lower limit of its downward travel (at the end of the

groove in which the bar moves or due to contact between the upper body member 20 and the casing C), further force (e.g. about 225kg (500 pounds)) on the upper body member 20 shears the pin 115 permitting the upper body member 20 to move further downwardly. As this is occur¬ ring, the lower body member 18 is forced sideways in the casing and eventually into frictional contact with the casing (see Fig. 13B). Friction members 94 on the lower body member 18 are forced into engagement with the casing C with their teeth oriented to inhibit upward movement of the lower body member 18. During movement of the upper body member 20, the parts of the device below the lower body member 18 pivot at the neck 38 of the flexion member 14 and at the notch 42 of the tube 16 so that the lower body member 18 moves sideways against the casing C. Once the two body members are wedged into place across the casing (see Fig. 13B) (i.e., the device 10 is stabilized so it does not move up or down in the casing or rotate therein), the installation tool 24 is freed from the system 10 by pulling up on the installa¬ tion tool 24 with sufficient force to shear the shear bolt 55 (e.g. 5400 to 6750kg. f (12,000 to 15,000 pounds force)). Upon removal of the installation tool 24 a milling tool may be inserted into the wellbore through the tubular T and casing C to contact the whipstock member 22 of the device 10 for a milling operation.

The whipstock 22, as shown in Fig. 16, due to the configuration of the hole 112, is free to move upwardly (e.g. about 13mm (0.5 inch)) in certain embodiments) A toggling connection according to the present invention connects the whipstock 22 and the upper body member 20. Initially it is restrained from such movement by a shear pin 133 (Fig.l). When an upward pulling force is ap¬ plied to the device 10 after the lower and upper body members 18, 20 have moved outwardly to wedge against the

casing, the shear pin 133 (Fig. 1) is sheared (e.g. at 3600kg.f (8,000 pounds force)) freeing the whipstock 22 to move and to pivot with respect to the upper body member 20. The shear pin 133 extends through a pin hole 165 in the upper body member 20 and a pin hole 167 in the whipstock 22 (Fig. 16). The whipstock 22 pivots on the connecting pin 114 which extends through a hole 116 in the upper body member 20 and a slot 112 in the whip¬ stock 22. The hole 116 and slot 112, recess 162, pin 164 and hole 168, are configured and positioned to allow the whipstock 22 to move and to pivot. As shown in Fig. 16, the slot 112 of the whipstock 22 provides room for the connecting pin 114 to move relative thereto and the recess 162 which initially encompasses the pin 164 is movable away from the pin 164.

Figs. 14A - 14D illustrate a device 200 according the present invention which has an anchor formed by an inflatable packer 201 with a guide key 202; a receptacle 203 for co-acting with the guide key 202 to orient the device 200; a tube 221 to interconnect the receptacle 203 and a link apparatus 205 (one or more connecting links); stabilizing spring bows 204 for centering the tube 221 in a casing C; the link apparatus 205 pivotably linking together the tube 221 and a lower body member 206; the lower body member 206 movably secured to an upper body member 207 by a wedge slide 208; the wedge slide 208 having a T-shaped member 209 movably disposed in a groove 211 in and along the top side of the lower body member 206 and a T-shaped member 210 movably dis- posed in a groove 212 in and along the bottom side of the upper body member 207; a whipstock 213 hingedly connected to the upper body member 207 with a pin 214; and an installation tool 215 secured to the whipstock with a shear bolt 216. A shear pin 217 secures the upper body member 207 to the wedge slide 208 and a shear

pin 218 secures the lower body member to the wedge slide 208.

As shown in Fig. 14A, the device 200 has been inserted through a tubular T which has a smaller dia- meter than the casing C. The shear pins 217 and 218 have not been sheared so the upper and lower body mem¬ bers 207, 206 have not moved with respect to each other.

As shown in Fig. 14B, downward force has been applied through the installation tool 215 shearing the shear pins 217, 218 and moving the upper body member 207 downwardly and sideways to contact the interior of the casing C. Further downward force on the installation tool 215 has pushed the lower body member 206 against the casing (Fig. 14C) and a toothed slip 219 has engaged the casing. Also, the upward force on the shear bolt 216 has been sufficient to shear it and free the instal¬ lation tool 215 which, as shown in Fig. 14C, has been removed. The lower body member 206 has pivoted on the link apparatus 205 and moved to engage the casing C. The whipstock 213 has pivoted at the pin 214 to fall back against the casing. An appropriate mill or other tool can now be inserted into the casing to engage the whipstock 213. A packer 220 is disposed between the tubular S and the casing C. Fig. 15 illustrates a device 250 according to the present invention which is similar to that of Fig. 14 and similar parts have similar references. The link apparatus 205 interconnects the tube 221 with a lower body member 226 having a toothed slip 229. An upper body member 227 with a toothed friction member 231 is pivotably connected to the lower body member 226 by link 228 and a whipstock 232 is formed integrally with the upper body member 227. The device 250 may include the other items shown in Fig. 14A and operates in a similar manner with the link 228 serving to control and guide

upper and lower body member movement.

Figs. 17 - 28 show an orientation assembly 300 according to the present invention which has a locking nut 330 ( like the locking nut 30 ) and a flexion member 314 (like the flexion member 14). The locking nut 330 has internal female splines 332 into which move and are positioned male splines 316 of the flexion member 314. Lower outer threads on the locking nut 330 threadedly engage inner threads on a lower nut 338 to secure the flexion member 314 to the locking nut 330. One or more set screws (not shown) extend through holes 302 in the lower nut 338 to secure it to the locking nut 330.

A receptacle 350 according to the present invention includes a receptacle nut 358; a hollow body member 352; an upper locking assembly 360; and a lower alignment assembly 370.

The hollow body member 352 has an upper fluid exit hole 351 and two side fluid exit holes 353 through which fluid in the hollow body member 352 may exit as another member (e.g. part of an anchor) enters a lower end 354 of the hollow body member 352 and pushes fluid out as it moves from the lower end 354 toward an upper end 355 of the hollow body member 352. A hole 382 (like the ports 82) permits fluid to exit from the receptacle nut 358. A screw slot 356 accommodates a screw as described below and a key slot 357 accommodates a guide key as described below. A groove 359 (Fig. 21) receives one or more detent members as described below. The hollow body member 352 has dual opposed guide surfaces 342 and 344 on a nose 340.

The lower alignment assembly 370 (see Fig. 22) is releasably and movably positioned in a central longitu¬ dinal channel 349 of the hollow body member 352. The lower alignment assembly 370: facilitates entry of another member, e.g. a male member of an anchor, into

the hollow body member 352; facilitates proper alignment of the male member with respect to the receptacle 350, thereby facilitating proper alignment of a tool, device or apparatus connected to the orientation assembly 300; facilitates movement of the male member within the hollow body member 352; and enhances stability of the male member within the hollow body member 352 both during movement and at a point at which the male member has moved to contact the upper locking assembly 360 (or some other upper part of the hollow body member 352 in embodiments not employing an upper locking assembly 360).

The lower alignment assembly 370 (see Figs. 22 - 28 ) has a body 371 with an upper hollow cylindrical portion 372 having an internal shoulder 373; one or more bores 374 in which detents 375 are fitted; a hole 376 in which a portion of a screw 377 is threadedly engaged, the screw 377 having a screwhead 378; an initial locking split ring 379 with two-way threads 381 (see Fig. 28); with a top 382 that abuts an inner shoulder 383 (Fig. 25) of the body 371; and a lower guide 384 with exterior threads 385 which engage interior threads 386 of the body 371 and a shoulder 387 that abuts a lower shoulder 388 of the body 371; the lower guide 384 having an inwardly tapered lip 389 to facilitate reception of another member in the lower alignment assembly 370.

Fig. 27 shows a detent 375 with a body 331 and a spring 333 therein which urges a detent ball 335 exter¬ iorly of the body 331 through a hole 336 (which is not large enough for the ball to escape). In one embodiment ten detents (e.g. see Fig. 26) are used and the force of the springs of all them must be overcome to free the lower alignment assembly 370 for movement with respect to the hollow body member 352. Preferably the detent balls 335 project into the groove 359 from which they

can be forced out with sufficient force. In one embodi¬ ment the detent balls 335 are 3mm (one eighth of an inch) in diameter and the groove 359 is rectangular with a depth (each side's extend) of 1.27mm (0.050 inches) and a width (bottom extent between sides) of 5mm (0.19 inches) . In one embodiment with ten detents the release force to be applied to each is about 54kg (120 pounds) and the total force to be overcome is about 540kg. (1200 pounds) to free the lower alignment assembly 370 for movement. In certain preferred embodiments this force is between about a total of 225 kg. (500 pounds) to about 675 kg. (1500 pounds). In one embodiment the cylindrical portion 372 of the body 371 is about 100mm (four inches) in diameter; and for other embodiments is, preferably, between about 5cm and 30 cm (two and about twelve inches long) .

Fig. 28 is an enlarged view of the initial locking split ring 379 and shows the two-way threads 381.

The upper locking assembly 360 has a split locking ring 361 (see Figs. 19E, 19G) with a top 362, a bottom 363, and interior locking one-way threads 364. The split locking ring 361 is held in place by a housing 365 so that the top 362 of the split locking ring 361 abuts the bottom 347 of the receptacle nut 358 and a lower shoulder 366 of the housing 365. The one way threads 364 are positioned to contact a member inserted into the split locking ring 361. In embodiments in which the inserted member has exterior threads or other protru¬ sions, the threads 364 are configured and positioned to co-act with the threads or other protrusions to lock the inserted member in the upper locking assembly 360. In certain embodiments in which non-releasable locking of the upper locking assembly 360 is desired, threads 364 may be two way releasing threads; they may be elimina- ted; or they may be configured to lock with a certain

force that may be overcome by pulling up on the hollow body member 352. The housing 365 has a flange 367 which is secured between a shoulder 346 of the hollow body member 352 and a shoulder 345 of the receptacle nut 358. In certain preferred embodiments the housing 365 and the receptacle nut 358 are configured, shaped and sized so the split lock ring is movable up and down with respect thereto some small distance, e.g. in one embodi¬ ment to a total extent of about 3mm (one eighth of an inch). Such movement makes it possible for the split locking ring 361, once it has engaged a portion of another wellbore tool, to be forced downwardly due to upward force on the tool containing the split locking ring and/or due to the weight of the engaged tool pull- ing down on the split locking ring. Such movement in¬ creases the force of the locking ring against the en¬ gaged tool due to the co-action of an inclined surface on the ring 361 moving downwardly and against a corre¬ sponding inclined surface on the lower shoulder 366. Thus enhanced locking force is achieved.

Figs. 29 - 34 show one method of operation of the orientation assembly 300. As shown in Fig. 29 a male member 400 of an anchor 402 has a tip 404 which has moved to contact the inwardly tapered lip 389 of the lower alignment assembly 370 of the hollow body member 352 of the orientation assembly 300.

As shown in Fig. 30, the male member 400 has moved further into the lower alignment assembly 370 and a portion of the male member 400 is aligned with the receptacle 352 (the central longitudinal axes of each are aligned) .

Fig. 31 illustrates further movement of the lower alignment assembly 370 in the hollow body member 352 with respect to the male member 400. Two way threads 381 of the initial locking split ring 379 have releasab-

ly engaged threads 406 on the exterior of the male member 400 and the male member 400 has rotated upwardly within the locking split ring's threads. A guide key 410 secured in a recess 407 on the body 408 of the male member 400 has not yet engaged either guide surface 342, 344 of the nose 340 of the hollow body member 352.

Fig. 32 shows the guide key 410 contacting a curved surface 342 of the nose 340. A contact surface 412 of the guide key 410 has been contacted by the surface 342 of the hollow body member 352 and the hollow body member 352, urged by the stationary guide key, has moved along the surface 412 of the guide key 410 and commenced to correctly orient itself with respect to the anchor 402. The downward force of the orientation assembly 300 against the anchor 402 has overcome the combined spring forces of springs of the detents 375, releasing them from the groove 359 of the hollow body member 352, thereby releasing the lower alignment assembly 370 for movement with respect to the hollow body member 352 and permitting the hollow body member 352 to move down over the male member 400. The screw 377 with its head 378 moves in the slot 356, stabilizing and limiting the movement of the lower alignment assembly 370. Initially screw 377 abuts a shoulder 343 of the slot 356 to pre- vent the lower alignment assembly 370 from falling out from the hollow body member 352.

Fig. 33 shows further movement of the orientation assembly 300 with respect to the male member 400.

Fig. 34 illustrates final locking of the male member 400 by the threads 364 of the split locking ring 361, of the upper locking assembly 360; and abutment of the guide key 410 against an inner edge 339 of the key slot 357. The upper cylindrical portion 372 of the body 371 of the lower alignment assembly 370 is now disposed between an exterior of the housing 365 of the upper

locking assembly and an interior of the receptacle 352, further stabilizing the receptacle 352 and anchor 402. For added stability the various parts are sized and configured so that the upper cylindrical portion 372 contacts (in certain preferred embodiments with minimal frictional force) the housing 365 and the interior of the receptacle.

Figs. 35A-D show anchor 450 according to the pre¬ sent invention with a guide key 460. The anchor 450 has a tubular body 452, a male member 454 with exterior threads 456 therearound. Item 458 represents schematic¬ ally anchoring apparatus for securing the anchor in a wellbore or tubular member. A bolt 462 secures the guide key 460 in a recess 461 of the male member 454. Figs. 49A-D show the wellbore anchor 450 according to the present invention with a guide key 465 (like the guide key 610, Fig. 37A).

Fig. 49B is a view of the side of the anchor 450 opposite the side with the guide key 465. Fig. 49C is a top plan view of the top of the anchor 450; and Fig. 49D is an underneath plan view of the bottom of the anchor 450.

Figs. 36A - 37F show guide keys for use with an¬ chors according to the present invention. Figs. 36A-F show the guide key 410 with a base 416, contact surfaces 412 and 414 which meet along the line 418, and a recessed hole 422 with an inner shoulder 424 through which a bolt or other securement is disposed to attach the guide key 410 to another member (e.g. the tubular body 452 of the anchor 450). The contact sur¬ faces 412 and 414 define a pointed arch which has proved far more effective than a semi-circular configuration. The pointed arch may be any multi-centre arch although a two centre arch such as a lancet arch, an equilateral arch or a drop arch give very satisfactory results.

Figs. 37A-F show the guide key 610 with a body 616, and contact surfaces 612 and 614 which meet along a line 618. Again, contact surfaces 612 and 614 define a poin¬ ted arch. Figs. 38 - 41 illustrate a support assembly accord¬ ing to the present invention which provides lateral support for a member or tool in a wellbore or tubular. A support assembly 1450 is shown for supporting a whip¬ stock 1451 (like items 22 or 213). The support assembly 1450 has a pin 1452 with a first end 1453 initially pro¬ truding inwardly from a curved portion 1454 of the whip¬ stock 1451 and a second end 1455 initially positioned within a channel 1456 through the whipstock 1451. A hole 1457 in the first end 1453 of the pin 1452 extends through the pin 1452. A wire or cable 1461 connected above the support assembly 1450 (e.g. but not limited to connection to a whipstock setting tool ) passes through the hole 1457 and prevents a spring or springs (de¬ scribed below) from pushing the second end 1455 of the pin 1452 outwardly from the whipstock 1451.

As shown in Fig. 38 the whipstock 1451 is posi¬ tioned in a central longitudinal channel 1458 of a length of casing 1459 and a cable 1461 has not yet been removed from the hole 1457 to activate the support as- sembly. A support pad 1460 is secured to the second end 1455 of the pin 1452 with a bolt 1462 which threadedly engages a hole 1463 in the pin 1452. Initially the support pad 1460 is positioned in the channel 1456 of the whipstock 1451. One or more compression springs 1464 urge the support pad 1460 away from an inner shoul¬ der 1465 of the channel 1456.

The pin 1452 has one-way exterior threads 1466 which permit the pin 1452 to move radially outwardly from the whipstock 1451 past corresponding one-way threads 1467 on a split lock ring 1468; but movement in

the opposite direction, i.e., of the pin 1452 back into the channel 1456 of the whipstock 1451, is prevented by the interlocking of the threads 1466 and 1467. Also inclined teeth 1469 on the split lock ring 1468 forced against corresponding inclined teeth 1471 on a station¬ ary ring 1470 inhibits movement of the split lock ring 1468 back into the whipstock 1451.

As shown in Fig. 41, the cable 1461 has been re¬ moved; the support assembly 1450 has been activated; and the pin 1452 with the support pad 1460 has been pushed out from the whipstock 1451 by the compression spring 1464 against the inner surface 1472 of the casing 1459. The dotted line in Fig. 41 indicates the position of a mill (not shown) which moves down the curved portion 1454 of the whipstock 1451. The support assembly 1450 inhibits the force of the mill from pushing the whip¬ stock 1451 out of its desired position. It is within the scope of this invention to use one or more support assemblies according to this invention to support and stabilize a wellbore tool or member (e.g. but not limi¬ ted to a whipstock), each with the same or a different length pin and/or each with a support pad of the same or different dimensions. In one embodiment the pin is made from steel and is cylindrical with a diameter of about 25mm (one inch). In another embodiment a support pad has a front face that is generally circular with a diameter of about 75mm (three inches).

Figs. 42 - 44 disclose another embodiment of a support assembly 1480 according to the present invention in a channel 1481 of a whipstock 1482 in a central long¬ itudinal channel 1483 of a casing 1484. Initially a pin 1485 is held immobile in the channel 1483 by a cable (not shown; like the cable 1461) which extends through a hole 1486 in a first end 1487 of the pin 1485. A com- pression spring 1488 abuts a bottom surface 1489 of a

hardened flanged ring 1490 made of hardened steel and urges a support pin 1491 with a support face 1492 out¬ wardly from the whipstock 1482. Initially prior to activation of the device, a stack of hardened steel washers 1493 is positioned in a hole 1430 of the hard¬ ened flanged ring 1490 with the pin 1485 extending therethrough. The diameter of the hardened steel wash¬ ers 1493 is greater than the diameter of the hole 1430 and the washers are disposed at an angle in the hole (falling out at the angle as shown in Fig. 43). Once the pin 1485 pushes the hardened steel washers 1493 from the hole and they move to a horizontal position (as shown in Fig. 42) they inhibit the support pin 491 from moving back into the hole and therefore back into the whipstock 1482.

As shown in Fig. 42, after removal of the restrain¬ ing cable, the pin 1485 has been pushed out from the whipstock 1482, urging the support face 1492 of the support pin 1491 against an interior surface 1496 of the casing 1484.

Fig. 44 shows an alternative disposition of a chan¬ nel 1497 in a whipstock 1498 in a casing 1499 for a sup¬ port assembly (not shown) according to the present invention to illustrate that it is within the scope of this invention to provide support assemblies which exit a whipstock (or other member or tool) at any desired angle. It is also within the scope of this invention to provide a plurality of support assemblies at different exit angles to support a member within a wellbore or channel of a tubular. Such assemblies, as desired, may also have pins of different length for positioning at different locations along a member or tool. As shown in Fig. 42, the channel 1481 is normal to a concave face 1439 of the whipstock 1482. The angle between the channel and the concave face 1439 may be any desired

angle; i.e., the support assembly may project from the tool with which it is used at any desired angle. As shown in Fig. 44, the channel 1497 is not normal to the face 1438 of the whipstock 1498. Figs. 45 - 48 illustrate a support assembly 510 according to the present invention for a wellbore tool or member; e.g. but not limited to a support for a whipstock 502. Initially two toothed bars 512 and 514 are disposed in a recess 516 in the whipstock 502. Two pivot links 518 and 519 pivotally link the two toothed bars 512 and 514 together. A pivot link 524 links the toothed bar 514 to an extension member 526 of the whip¬ stock 502 and prevents the toothed bar 514 from moving upward (to the left as shown), while allowing it to move outwardly with respect to the whipstock 502. A pin 520 has a head 522 with a hole 523 therethrough and a body 527 which extends through a slot 528 in the whipstock 502 and into a hole 532 in the toothed bar 512. An activating wire or cable (not shown) initially is se- cured in or through the hole 523. As shown in Fig. 45 the pin 520 has not been moved in the slot 528 and the toothed bars 512 and 514 are in their initial position abutting each other in the recess 516 of the whipstock 502. Initially the pin 520 has a lower end abutting a stop member 554 (e.g. a piece of mild steel welded into the recess 516).

As shown in Fig. 46 the pin 520 and the toothed bar 512 have been pulled by a rod or a flexible cable con¬ nected to, e.g. a whipstock setting tool (not shown); so that the pin 520 has moved to about the mid-point of the slot 528, pivoting the toothed bar 514 outwardly due to the force of faces 534 of teeth 536 against faces 544 of teeth 546 of the outer toothed bar 514.

As shown in Fig. 47, the toothed bar 512 has been pulled to its farthest upward (to the left in Fig. 47)

extent by the rod or a flexible cable and an end 542 of the toothed bar 512 abuts an inner surface of the recess 516. Further force of the cable on the head 522 has sheared it and removed it. Flat end faces 552 of the teeth 536 have moved to abut and oppose flat faces 548 of the teeth 546 which prevents the toothed bar 514 from returning into the recess 516. Fig. 48 illustrates an¬ other view of the whipstock 502 and its recess 516.

The outer face of the toothed bar 514 may have a pad thereon or teeth therein for contacting and engaging a casing. In one embodiment the toothed bars (like items 512 and 514) are made from steel and are about 600mm (two feet) long. Due to the configuration, size, and position of the toothed bars, teeth, tooth faces, and pivot links of the support assembly 510, the bars move and are eventually disposed parallel to each other. However, it is within the scope of this invention to alter the dimensions, configuration, and disposition of the various parts to achieve a resulting angle of incli- nation of one bar with respect to the other. In one aspect this is useful to achieve extended contact of a bar against a wellbore or inner tubular surface when the bar is connected to a member which itself is substanti¬ ally inclined with respect to a central longitudinal axis of the wellbore or tubular. As shown in Fig. 47, the toothed bar 514 when extended is at an angle to the exterior surface of the whipstock 502, and at such an angle that the toothed bar's resulting position is substantially parallel to an interior surface of casing in which the device is disposed for increased and effec¬ tive engagement of the interior of the casing.

Figs. 50A and 50B show a survey tool assembly 600 according to the present invention which has an orienta¬ tion indicator tool 602 (shown schematically) (e.g. a typical orientation tool with gyroscope and associated

lines); and an orientation assembly according to this invention as previously described, e.g. an embodiment of the orientation assembly 300. The survey tool assembly 600 has an orientation assembly such as the orientation assembly 300 with a lower alignment assembly 370 and an upper locking assembly 360 in which the upper locking assembly has a releasable upper locking split ring as previously described herein. The orientation assembly of the survey tool 600 operates as previously described herein; permitting the survey tool assembly to encoun¬ ter, engage, and co-act with a wellbore anchor so that the orientation indicating tool 602 can sense and/or record the orientation direction of the wellbore anchor; then upon release of the orientation assembly from the wellbore anchor, allowing retrieval of the survey tool assembly at the surface (and/or signalling from the wellbore of the wellbore anchor's orientation). The results of the survey enable the whipstock to be cor¬ rectly orientated with respect to the receptacle before the device is lowered down the well.

Fig. 51 shows another embodiment of the survey tool assembly 600 which has no upper locking assembly 360 or the like but does have a lower alignment assembly 370.

Figs. 52A - E illustrate a split locking ring 650 (like the split locking ring 361). The split locking ring 650 has a body 652, a top 653, a bottom 654, an inner wall 658, and a side wall 655. A notch 656 ex¬ tends from the top of the ring to the bottom. Locking threads 657 extend around the ring's inner wall 658 (which in this aspect are permanently locking but may be configured as two-way releasing threads, see e.g. the threads in Fig. 28).

Figs. 53A - D and 54A - C illustrate another device 700 according to the present invention for orienting and setting a whipstock in a wellbore, cased wellbore,

tubing string, or other tubular member. The device 700 is shown in a casing 698. Various devices and struc¬ tures which appear in previously described figures are similar to structures in the device 700; e.g. a whip- stock 722 is similar to the whipstock 22. In the device 700 an interior rod or series of two or more intercon¬ nected rods do not move to move a block which prevents system actuation and setting until correct system orien¬ tation has been achieved. Correct system orientation is achieved when a receptacle 712 is correctly engaged with an anchor (not shown), e.g. like the anchor 26 in Fig. 1.

Referring now to Figs. 53A - D, a device 700 ac¬ cording to the present invention has a receptacle 712 to which is secured a flexion member 714. The flexion member 714 with a neck 738 and its associated appara¬ tuses and connections are similar to the flexion member 14 of Fig. 1. A connecting bar 715 interconnects a lower body member 718 and an upper body member 720. The whipstock 722 is secured to a top of the upper body member 720. An installation tool 724 is releasably secured to a top of the whipstock 722 and has a thrust bearing 774.

The installation tool 724 is like the installation tool 24 of Fig. 1 and its associated apparatus and connections are also similar to those of the installa¬ tion tool 24. A support assembly 710 is similar to the support assembly 510 of Fig. 45.

Figs. 53A and 58 illustrate a support assembly 710 according to the present invention for a wellbore tool or member; i.e. not limited to a support for a whipstock 722 (as shown in Fig. 53A). The support assembly 710 is similar to the support assembly 510 of Fig. 45, but has different apparatus for freeing the installation tool 724 from the whipstock and for freeing the support

assembly 710 for outward movement with respect to the upper body member 720.

Initially the installation tool 724 is releasably secured to the whipstock 722 as shown in Fig. 53A and Fig. 57. A shear bolt 781 has a neck 782 secured in a hole 783 in a toothed bar 792. The shear bolt 781 has one or more holes 784 therethrough and a lower end of a rod 785 extends through a hole 784.

Lock nuts 786 prevent the rod from exiting upwardly through the hole 784.

As shown in Fig. 57, an upper end of the rod 785 is received and held in a hole 787 in a block 756 (like the block 56 of Fig. 1) which is secured to both the instal¬ lation tool 724 and to the whipstock 722. The neck 782 of the shear bolt 781 extends into the whipstock 722 and prevents movement of the toothed bar 792 (like the toothed bar 512 of Fig. 45) thereby preventing actuation of the support assembly 710. A shear bolt 789 secures the whipstock 722 to the installation tool 724. Once the device 700 is correctly oriented and set in place, upward force on the installation tool 724 shears the shear bolt 789 and results in upward movement of the rod 785 in the hole 784 of the shear bolt 781. The lock nuts 786 contact the shear bolt 781 and further upward force on the rod 785 shears the shear bolt 781, freeing the installation tool 724 for removal from the casing. At the same time the toothed bar 792 is freed for movement and the support assembly 710 (with other parts like those of the support assembly 510) is actua- ted and moves to the position against the casing 698 as shown in Fig. 54A.

To prevent return of the toothed bar 792 to its initial position (which would result in disengagement of an outer toothed bar 925 from the casing), a blocker 788 is forced by a spring 790 to occupy space previously

occupied by the lower end of the toothed bar 792, thus preventing the toothed bar 792 (see Fig. 53A) from returning to its original position (see Fig. 58). The spring 790 is biased against a plate 797 which is se- cured to the whipstock 722, e.g. by welding.

Figs. 53C, 55, and 56 show the connecting bar 715 and associated apparatus and connections. The bar 715 operates generally as does the connecting bar 15 of Fig. 3, but a movable block 810 initially prevents the upper body member 720 from moving with respect to the lower body member 718. The movable block 810 has a head 812 which abuts a lower surface 814 of the upper body member 720. A lower surface 816 of the head 812 abuts an upper surface 818 of a recess 820 in the connecting bar 715. A pin 822 contacts the movable block 810 and extends into the lower body member through the connecting bar 715 and an end 826 of the pin 822 contacts a tongue 828 of a top rod member 830 which (as described below) is associated with rods extending downwardly through the center of the device to contact an upper portion of an anchor.

The head 812 of the movable block 810 and the tongue 828 of the top rod member 830 are sized, confi¬ gured, and positioned so that upward movement of the tongue 828 results in movement of the end 826 of the pin 822 up on a ramp portion 832 of the tongue 828, thereby effecting outward movement of the head 812 from the recess 820. At this point the lower surface 816 of the head 812 no longer abuts the upper surface 818 of the recess 820. Thus downward force on the upper body member 720 results in movement of the upper body member 720 with respect to the connecting bar 715 and then movement of the connecting bar 715 and upper body member with respect to the lower body member 718. The tongue 828 does not move to push out the head 812 until the

system is correctly oriented on the anchor.

Referring now to Figs. 53D, 54C, 59 and 60, the flexion member 714 (like the flexion member 314 of Fig. 18) has a central longitudinal channel 842 through which movably extends a plunger rod 840. An end 844 of the plunger rod 840 extends into the receptacle 712 for contact by an upper end of an anchor (not shown). As the receptacle 712 moves down to and over the anchor, the upper end of the anchor member pushes the plunger rod upwardly through the splined flexion member 714. As the plunger rod 840 moves up, it in turn moves a middle rod 850 upwardly. The middle rod 850 movably extends through central longitudinal channels in the splined flexion member 714; in a central channel 847 of an adapter 848 (like the adapter 28 in Fig. 1); in a cen¬ tral channel 855 of a tube 856 welded to the lower body member 718; and in a central channel 857 of the lower body member 718. As shown in Figs. 54C and 60, the middle rod 850 bends upon relative movement of the two body members.

The plunger rod 840 and the middle rod 850 may, according to this invention, be one integral rod; how¬ ever such an integral rod would render more difficult a disassembly of the tool at various points, e.g. at the point of the flexion member. A collar 929 at the top of the plunger rod 840 prevents it from falling out of the receptacle.

A keyway 859 (Fig. 56) in the middle rod 850 re¬ ceives and holds a key 861 of the top rod member 830. To ease assembly there may be some play in the key- keyway fit, e.g. about 1.5mm (one-sixteenth of an inch). Slips 794 (like the slips 94 of Fig. 10A) are held in place with screws 927 and have a rear keyway 862 (Fig. 65) which receives a portion of the top rod member 830 which is movable therein. Thus the top rod member 830

is movable up and down with respect to the slips 794.

Fig. 61 shows the movable block 810 which is mov¬ able with respect to the lower body member 718. A rear key 901 on the block 810 is received in and movable in a keyway 902 with a corresponding shape in the upper body member 720. Initially a spring-loaded plunger detent 903 projects into a detent hole 904 in the upper body member 720 to prevent movement of the movable block 810 with respect to the upper body member. Two bottom keys 905 rest in bottom recesses 906 in the lower body member 718 preventing longitudinal movement of the movable block 810 with respect to the lower body until the movable block 810 is moved sufficiently outwardly to free the bottom keys 905 from the bottom recesses 906. Bolts 907 extend through enlarged slots 908 in the movable block 810 and are secured in bolt holes 908 in a surface 911 of the upper body member 720. After the movable block 810 has moved in the keyway 902 away from the lower body member 718, the bolts 907 still secure the movable block 810 to the upper body member 720. The pin 822 has a top end which contacts a stub 914 of the movable block 810 and a bottom end 915 which projects into a channel 916 for contact by the tongue 828 (Fig. 62) of the top rod member 830. The tongue 828 and top rod member 830 are sized and configured for movement in the channel 917 to contact the pin 913; overcome the force of the plunger detent 903 freeing the movable block 810; moving the movable block 810 outwardly from the lower body member 718, freeing the bottom keys 905 from the bottom recesses 906, and moving the movable block 810 with respect to the bolts 907 extending there¬ through. At this point the bolts 907 connect the mov¬ able block 810 to the upper body member 720 and the movable block 810 is free of the lower body member 718 so that the upper body member 720 is free for movement

with respect to the lower body member and the connecting bar to set a tool or whipstock system.

Fig. 62 shows an exploded view of the top rod member 830, associated slips 794, the lower body member 718, the middle rod 850, the connecting bar 715, the pin 822, and the movable block 810.

Fig. 63 is an enlarged view of the connecting bar 715, pin 822 and movable block 810.

Fig. 64 is an end view of the movable block 810, the connecting bar 715 and the pin 822.

Fig. 65 shows a cross-sectional view which reveals the relationship of one of the slips 794, its rear keyway 862, the top rod member 830 and the lower body member 718.

* * *

Figs. 66A and 66B shows a prior art milling tool M (e.g. a diamond speed mill) with a mill body B having a circulating-cooling central fluid flow channel F there¬ through which intercommunicates with a plurality of fluid flow channels C each having a flow exit port P on a bottom end E of the mill body B.

A plurality of milling elements S are disposed on a circumferential side surface A of the mill body B, and on the bottom end E.

Fig. 67 shows a milling tool 970 according to the present invention which has a tool body 971 with a shoulder 972 and lower milling head 973. The milling tool 970 has fluid flow ports and a central channel (not shown) like those of the milling tool M of Fig. 66A. A flow director 980 is secured to a bottom end 974 of the tool body 971 (secured e.g. by epoxy, screws, and/or bolts; bolts and screws are preferably disposed off- center with respect to the flow director 980 and off-

center and away from the central flow channel through the tool bod ) .

As shown in Fig. 69 the flow director has a body 982 and a series of flow directing chambers 983 defined by side walls 984 and an upturned lip or end wall 985. One chamber corresponds to each flow port and exit opening. It is within the scope of this invention to eliminate the side walls 984.

An upper threaded end 976 provides for threaded engagement of the milling tool 970 with other connectors or tools. Arrows indicate fluid flow direction. Mill¬ ing elements 979 (e.g. but not limited to diamond mill¬ ing elements which work more effectively when cooled by the flowing fluid) are on the circumferential side surface of the lower milling head 973, on the shoulder 972 and on the bottom end 974. The curved corner shaped of the flow director 980 facilitates co-action of a milling tool with the concave surface of a whipstock. With a flow director made of aluminium or plastic, such a flow director can be easily worn away by a formation after a side milling operation is completed to expose milling elements on the lower end of the tool body.

Fig. 70 shows a mill 950 according to the present invention with a mill body 951 having a central circula- ting fluid flow channel 952 therethrough which communi¬ cates with a plurality (one or more) side fluid flow ports 953 each having an exit opening 954 on a circum¬ ferential side surface 955 of a mill head 956. A plur¬ ality of milling elements 957 are on the side of the tool and on an upper shoulder 958 and lower end 959. A top end 960 of the mill 950 is threaded. This tool may also have one or more fluid flow ports 962 with an exit opening at a lower corner 963 of the mill head 956 (like those of the tool in Fig. 68A). Fig. 68A shows a mill 930 with a head 935 with

milling elements 931 on a side circumferential surface

932 thereof. Such elements may also be used on the bottom end of the tool. A plurality of fluid flow ports

933 communicate with a central fluid flow channel 934through the mill 930 to provide fluid to exit at bottom end corners 939 on the mill 930 to cool the milling elements 931. The mill 930 has an upper threa¬ ded end 936 for interconnection with other wellbore apparatuses. Milling material and/or elements 937 may be provided on an upper shoulder 938 of the mill 930.