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WO/1998/012413A2 |
A milling system has been invented for milling an opening in a tubular string in a wellbore extending down from a surface of the earth, the milling system, in one aspect, has a whipstock connected to an anchor assembly and a mill apparat...
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WO/1998/009049A1 |
An improved method and apparatus for sealing a junction between a central and lateral wellbore are provided. In a broad aspect, the method of the present invention includes installing a polymerizable sealing sleeve (48) within a first ca...
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WO/1998/007955A2 |
The present invention provides a downhole cutting tool (20) for cutting materials at a worksite in a wellbore (22). The cutting tool includes a cutting end (32) that is adapted to discharge a high pressure fluid therefrom. A power unit (...
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WO/1998/005846A1 |
An apparatus for cutting a tubular in a wellbore which apparatus comprises a mandrel (14), a cutting blade (24) and means (56) for moving said cutting blade radially outwardly from a retracted position to an extended position with respec...
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WO/1998/005845A1 |
The method and apparatus of the present invention allow the creation of a window in casing downhole using explosive techniques. Locating stakes (10) are initially placed and subsequently surveyed for their depth and orientation. The wind...
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WO/1998/004806A1 |
A plug (1) comprises a barrier portion (5) and a cutter mechanism (8) which can cut an aperture in the plug (5) when in place in a well by piercing the plug, cutting a portion of it and moving the cut portion from the fluid path through ...
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WO/1998/004804A1 |
A milling apparatus which comprises a mill, and a starter bar which depends from said mill, characterised in that said starter bar is detachably connected to said mill.
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WO/1998/003772A1 |
A spiral-shaped roller cutter (3), which can efficiently and surely cut reinforcement (7) embedded in existing pipes (6), and a tunnel excavator cutter head (1) provided with the same. Thus the spiral-shaped roller cutter (3) is provided...
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WO/1998/002638A1 |
The present invention provides a downhole service tool for imaging a location constituting a work site of interest downhole at which a tool operation is to be performed in a preexisting wellbore and for performing a tool operation at the...
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WO/1998/000626A1 |
A tubing (4) made of a formable steel grade which is subject to strain hardening without incurring any necking or ductile fracturing as a result of the expansion process is expanded by moving an expansion mandrel (5) having a non-metalli...
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WO/1997/045619A1 |
A single trip tool (10) and method for cutting a window (41) through a well casing (11) and installing an anchoring and orientating sleeve (29) in the casing (11) adjacent the window for subsequent well procedures and equipment installat...
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WO/1997/045623A1 |
A diverting tool (10) having a deflecting surface (10a) equipped with an anchor that secures the tool (10) at desired subsurface location within the casing of a primary well bore to divert drilling equipment used to drill a lateral bore ...
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WO/1997/044566A1 |
To separate relatively long upright pipes (13) which have a relatively large diameter, the lower end thereof being fixed in the ground, in particular of support legs (3) of an off-shore oil bore or conveying platform (100), a cutting uni...
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WO/1997/033066A1 |
The invention provides a method of cutting a well casing located beneath a subsea wellhead (1), the method comprising the steps of: running a cutting tool through the wellhead (1) into the casing; securing the position of a motor (7) rel...
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WO/1997/027380A2 |
A method for forming a window in a tubular comprises the steps of: placing an apparatus (10; 15) having a bore (8; 19) therethrough at a desired location in said tubular (5; 22); introducing a mill (11; 25) into said apparatus (10; 15) u...
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WO/1997/021903A1 |
Apparatus for forming a window (250) or the outline of a window in the casing (201) of a wellbore comprises an explosive (220) and locating means for positioning the explosive in the casing (201). The explosive (220) is shaped, sized and...
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WO/1997/017523A1 |
A chain saw for cutting slots in a wellbore casing and the surrounding formation comprises a pair of cutting chain assemblies (37) rotatably mounted on a body and moveable from a storage position in which the axes of the cutting chain as...
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WO/1997/013954A2 |
A mill (M) for wellbore milling operations comprises a body (10) with a bore (100) therethrough, at least one milling surface on the body (10) and flow control apparatus within the body for selectively controlling fluid flow through the ...
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WO/1997/013053A1 |
Apparatus for milling the casing of an oil or gas well comprises a downhole assembly which is run into the well on a rotatable drill string. The assembly comprises a motor (6) the body of which is connected to the drill string and the ou...
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WO/1997/012112A1 |
In a cased wellbore (10) having one or more cased and cemented drainholes (24) extending therefrom such that the elliptical shaped opening (46) or junction of each drainhole (24) with the primary well (10) is sealed and cut flush with th...
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WO/1997/011250A1 |
Milling apparatus (10) comprises three blades (20) the lower part of which are pivotally monted to a mill body (12). The blades (20) pivot outwardly in response to downward movement of a wash tube (30) which contacts the blades (20). The...
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WO/1997/011251A1 |
A cutting insert (10) for use in a wellbore milling tool comprising a base which can be mounted on a surface of said wellbore milling tool and a plurality of cutting surfaces (25, 26, 27) which are separated from one another by linear bo...
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WO/1997/011249A1 |
A wellbore sidetracking method comprises milling out a section from a length of casing; placing a whipstock across the milled out section, removing part of the casing opposite the top of the whipstock and lowering a drill to cut the new ...
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WO/1997/010409A1 |
A guide lug for a starting or window mill is provided at the upper end of the whipstock. A back-up shoulder is provided to act against any tendencies of the mill to whirl. A taper is provided for use in guiding the mill toward the casing...
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WO/1997/004208A1 |
A method of forming and lining a branch borehole comprises installing a packer in a main borehole, installing a whipstock on the packer, milling a window in the main borehole casing using the whipstock, recovering the whipstock, and then...
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WO/1997/003274A1 |
A single trip whipstock assembly which can be run into a well, set, and operated from a window in the well casing in a single trip comprises a milling tool (5) attached to the upper end of a whipstock (6) to the lower end of which is att...
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WO/1996/038648A1 |
A one-trip system for milling a window using a whipstock is disclosed. The whipstock (10) can be set on a packer or anchor which can be an electric line-type packer (P) which, without modifications, can be set with the hydraulic mechanis...
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WO/1996/030623A1 |
A milling tool (110) is provided with a valve member (122) which can be displaced to inhibit the flow of drilling fluid through the milling tool (110). A whipstock (150) is provided with a stop (155) which the valve member (122) engages ...
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WO/1996/030622A1 |
A whipstock (1) comprises a concave (2) which comprises a tapered support member (3) which accommodates a plurality of spacers (7). The spacers (7) can be moved from an inoperative position to an operative position in which they project ...
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WO/1996/021083A1 |
A method and a device for casing a well, particularly an oil well bore or a pipe, using an in situ curable flexible tubular preform, by inserting the preform into the well or pipe in a longitudinally folded state, then deploying the pref...
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WO/1996/018022A1 |
A damage-resistant filter for use in subterranean wells has at least one layer of a filter medium (13), such as a sintered supported porous membrane, coaxially disposed about a perforated support member (11). The filter may also include ...
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WO/1996/009460A2 |
Apparatus for milling a well casing (15) comprising an elongate guide member (1) having a leading end and a trailing end, the guide member having defined thereon a guide track (23) which, in the use position of the guide member, converge...
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WO/1996/004457A1 |
A cutting device for making a slot adjacent to a well traversing an underground formation comprises a chain saw arm (15) which carries an endless chain (24) with cutting elements (25). In use the chain (24) is rotated around the arm (15)...
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WO/1995/035429A1 |
A pipe cutter (1) suitable for cutting the casing of a well bore, comprises a body (2) having a plurality of knives (4) pivotally mounted thereon and each rotatable between a storage position (as shown) in which the knives do not extend ...
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WO/1995/025875A1 |
A milling tool (40, 50) is provided with an axially extending passageway (44, 54) which can accommodate a whipstock orientation member (60) after a whipstock has been set. Alternatively, the passegeway (44, 54) may simply be used to acco...
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WO/1995/025002A1 |
The invention provides that a flexible lining tube (18) is inflated by a first fluid (20) against a pipeline or passageway (10) to line same. The resin which is UV light curable is then cured by passing an annular structure (24) housing ...
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WO/1995/016102A1 |
A method and apparatus for abandonment of an underwater well head which includes a string of capped concentric casings (36) with at least one casing supported within another casing by a suspension arrangement, the method comprising explo...
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WO/1995/009963A1 |
A method and apparatus for penetrating a well casing (12) and surrounding earth strata includes the insertion of a flexible shaft (24) having a ball cutter (22) on an end thereof into upset tubing (18) within a well casing. The upset tub...
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WO/1995/007404A2 |
A number of devices are used in combination for helping ensure that a whipstock (22) is correctly positioned and held firmly in place. These include improved anchoring apparatus (15, 18, 20), an improved receptacle (12) for mounting the ...
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WO/1995/003473A1 |
A tool (22) for cutting or milling casing in a well is disclosed. It includes a plurality of blades (36) extending outwardly to a substantially radial position for cutting the walls of casing strings and removing a predetermined length o...
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WO/1995/003474A1 |
A tool (22) for cutting or milling casing in a well is disclosed. It includes a plurality of blades (36) extending outwardly to a substantially radial position for cutting the walls of casing strings and removing a predetermined length o...
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WO/1994/028284A1 |
A damage resistant sand screen assembly has at least one layer of a sintered porous medium (10, 11, 12), preferably a sintered metal membrane, coaxially disposed about and secured to a perforated core (1). The assembly may also include a...
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WO/1994/025655A1 |
This tubular structure comprises at least a braiding of flexible strands (10) made of fibres (100) that are interlaced with a certain amount of clearance so that the structure is capable of expanding radially whilst being constrained in ...
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WO/1994/025725A1 |
An apparatus for plugging a burning or gushing well comprises a hollow tubular plug body (20) sized for insertion into a well casing (112). Provided on the plug body are a retainer module (54) for retaining the plug within the well casin...
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WO/1994/021886A1 |
A method for zone (10, 12, 14) isolation or replacing a damaged or corroded casing (20) with a solidifiable epoxy resin mixture. An amount of the mixture sufficient to form a hardened plastic or solid, underwater or at low wellbore tempe...
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WO/1994/020727A1 |
An anchor (A) or guide assembly (GA) connects with a workstring (WS) that may include a drill string (DS). The guide assembly (GA) includes an internal tubular member (ITM) to releasably connect with the workstring (WS). A tube (CT) is w...
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WO/1994/018429A1 |
A sealing device (6) for sealing holes in a casing (1) of a curved oil well, comprising a pipe device (52, 53) together with a packing (60, 62) and an engagement section (50, 51) at each end of the pipe device (52, 53). The packings (60,...
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WO/1994/016190A1 |
A method and apparatus for setting a whipstock (10, 62) in a subsurface well conduit (1) using a combination of an accelerator tool (96), jar tool (98), and setting tool (100), and a whipstock (10, 62) being shearingly carried by the set...
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WO/1994/015062A1 |
An anti-rotation device (7; 107) for use in a well tool, for example a top plug (1) or a bottom plug (101), has a tapered male member (7; 107) having a corrugated outer surface (8; 108) which can enter a corresponding recess (114; 214) i...
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WO/1994/009248A1 |
A method for forming a window (45) in a subsurface well conduit (1) using a coiled tubing unit (46) together with standard rotary rig tools adopted for use with a coiled tubing unit, and a whipstock (62) with no wear projection on the gu...
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