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6991048 |
In accordance with one embodiment of the present invention, a method for drilling wellbores includes drilling a main wellbore, disposing a casing string having a deflecting member at a lower end thereof in the main wellbore, disposing a ...
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6968903 |
A whipstock assembly includes a whipstock body 8 having a whipstock center of gravity offset radially from the central axis of the whipstock body, a counterweight to releasably secured to the whipstock body, with a counterweight having...
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6964303 |
A method and apparatus for horizontally drilling in wells utilizing a shoe assembly at the down hole end of upset tubing. The shoe assembly includes a fixed section and a rotatable section suspended below the fixed section. An electric m...
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6915853 |
In connection with a method and a tool for preparing a well for the production of hydrocarbons, it is aimed at perforating a casing portion ( 26 ) and working surrounding sediment ( 80 ) in a channel-forming manner. For this purpose the ...
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6899173 |
A through tubing retrievable whipstock and installation method is disclosed. In the preferred embodiment, a plurality of anchor links pivot at one end and have wickers on an opposed rounded end. The links are configured to deliver an opt...
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6889781 |
A method and apparatus for horizontally drilling in wells utilizing a shoe assembly at the down hole end of upset tubing. The shoe assembly includes a fixed section and a rotatable section suspended below the fixed section. An electric m...
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6848508 |
A guide tube bundle includes two or more guide tubes. Each guide tube includes a first aperture at a first end and a second aperture at a second end. The longitudinal axis of the first aperture of each guide tube is offset from the longi...
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6786283 |
Apparatus and methods are provided which enhance drilling and completion of wellbore intersections. In a described embodiment, a cutting tool diverter is used to drill a branch wellbore extending outwardly from a main wellbore. The diver...
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6755248 |
A one-trip through tubing window milling system is disclosed. The whipstock is delivered with the mill and downhole motor in a downhole assembly which further includes MWD equipment for proper whipstock orientation. The entire assembly i...
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6715567 |
The present invention generally provides an apparatus and method for forming a pilot hole in a formation. In one aspect of the present invention, the apparatus may comprise a starter mill connected to a bearing mill by a body joint. The ...
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6712144 |
An improved method for drilling a lateral well from an existing wellbore is disclosed whereby a section of said existing wellbore is preferably enlarged such as by under-reaming. The enlarged section is filled with a material such as, fo...
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6470978 |
A self-advancing drilling system comprising a drilling apparatus, the drilling apparatus having at least one leading fluid cutting nozzle, means on the drilling apparatus to provide forward movement to the drilling apparatus, the drillin...
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6419012 |
An assembly for formation and completion of deviated wellbores is disclosed which includes a toolguide and a casing section which can be used together or separately. The toolguide includes a lower orienting section and a whipstock having...
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6419010 |
An assembly for formation and completion of deviated wellbores is disclosed which includes a toolguide and a casing section which can be used together or separately. The toolguide includes a lower orienting section and a whipstock having...
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6386287 |
A wellbore casing, including a casing section, for deployment in a subterranean wellbore. The casing section includes a pre-milled windowed opening. A liner is disposed within the casing section covering the window opening from the insid...
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6334485 |
An assembly for formation and completion of deviated wellbores is disclosed which includes a toolguide and a casing section which can be used together or separately. The toolguide includes a lower orienting section and a whipstock having...
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6302198 |
A one trip whipstock system includes both a one trip combination mill and associated whipstock. The one trip combination mill comprises an upper cutter and lower cutter below the upper cutter. The upper cutter and lower cutter are joined...
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6283208 |
An assembly for formation and completion of deviated wellbores is disclosed which includes a toolguide and a casing section which can be used together or separately. The toolguide includes a lower orienting section and a whipstock having...
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6279659 |
An assembly for drilling at least one lateral well from a well bore having a longitudinally premilled window formed therein and having a first orientation key-way member formed in the premilled window and in communication with the premil...
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6247541 |
A method for replacing an old drive pipe in a slot on an offshore platform. The old drive pipe is first cut to provide an upper portion and a stub portion which remains firmly embedded in said marine bottom. Next, a guide cable is affixe...
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6209645 |
A method and apparatus for predictable downhole milling of a casing window having predetermined location, orientation, dimension and contour geometry. An elongate substantially rigid milling shaft has at least one casing window milling e...
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6209635 |
In a broad aspect, the invention may include a nipple, a deflector, and a conveying tool. The nipple may include an upper sealing surface and a lower sealing surface. The nipple may also include a discriminator/muleshoe having an alignme...
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6202761 |
A directional or horizontal hole may be drilled into a formation by first positioning or orienting a window turning shoe in an original well bore. Once the window turning shoe has been positioned, a window is milled through the casing wi...
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6192748 |
A directional drilling control system allows dynamic orientation of downhole drilling equipment in unstable or corrupt natural magnetic fields without the use of gyroscopic measurement devices. The system is especially suited for sidetra...
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6186233 |
Down hole assembly and method for forming a longitudinal window and a key-way in communication with the longitudinal window used in drilling multi-lateral well bores and for entry and reentry thereafter comprising, a first milling drill ...
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6102123 |
The milling and whipstock assembly includes a whipstock having a ramp portion for directing the milling assembly to cut a secondary borehole in an existing cased borehole. The milling assembly includes a shaft having rigid and flexible p...
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6050334 |
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6012516 |
An assembly for formation and completion of deviated wellbores is disclosed which includes a toolguide and a casing section which can be used together or separately. The toolguide includes a lower orienting section and an upper section h...
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5964287 |
A window assembly is provided for use at a downhole location in a first wellbore to control access to or allow isolation of a second wellbore extending from the first wellbore. The window assembly is included as an integral part of a pro...
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5884698 |
The whipstock assembly comprises an assembly casing (9) with preformed windows connected to production casing (7); a landing tube (21) is located within assembly casing (9) for receiving whipstock shaft; a key is located within tube (21)...
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5826651 |
Wellbore operations (e.g. for milling and/or drilling) are disclosed which require a reduced number of tool trips into a wellbore to create a cut-out pocket or window in a tubular such as casing in the wellbore and, in some aspects, to c...
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5727629 |
A method for milling an opening in a tubular in a wellbore, the method comprising installing a mill guide in the tubular at a desired milling location, inserting milling apparatus through the tubular and through the mill guide so that th...
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5657820 |
A two trip sidetrack casing milling apparatus for elongating and enlarging a previously formed window in a cased borehole in preparation for a subsequent sidetracking drilling operation is disclosed. The apparatus consists of three mills...
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5584350 |
A wellbore sidetracking method has been invented which includes, in certain embodiments, milling out a casing section from a cased, cemented wellbore; placing a deflection device, e.g. a whipstock, so that, upon pivoting of the upper con...
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5544704 |
A whipstock for use in sidetrack drilling operations in a well bore. The whipstock has a whipstock case with a whipstock body disposed therein. The whipstock is to be comprised of a drillable material so that after the whipstock has been...
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5535822 |
The retrieving tool includes a first mandrel having an upper end adapted for attachment to a running string, and a lower end. A second mandrel is positioned below the lower end of the first mandrel. The second mandrel and first mandrel a...
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5437340 |
A millout whipstock has a cylindrical body with a stabbing nose at the bottom and a deflection shoe at the top. A drill string extending through the deflection shoe is connected to a pressure housing keyed in a torque key housing in the ...
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5435400 |
A method for enhancing the productive capacity of a primary wellbore containing a conduit string such as casing involving removing at least a partial radial section of the casing to provide an aperture therein, setting tubing carrying a ...
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5383522 |
A whipstock and method of using same wherein first and second opposing ends of the whipstock are joined by opposing back and guide surfaces and the second or upper end of the whipstock is composed of at least two surfaces, the first surf...
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5379845 |
A method for setting a whipstock in a wellbore on a packer-anchor which employs a wireline that carries a setting assembly which severs a shear member carried by the setting assembly after the whipstock is set onto the packer-anchor.
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5335737 |
A retrievable whipstock which can be hydraulically set within a wellbore and following the drilling procedure mechanically released and retrieved for future use. The whipstock includes a whip which directs a milling tool from the main we...
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5297638 |
Offshore well slots are recovered by cutting off old drive or surface pipe below the mud line to form a stub end. A new drivepipe is installed with a guide and shield device disposed on the scarfed lower end or "mule shoe" of the new dri...
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5052502 |
The present invention comprises a novel method and apparatus for sinking drill holes in underground rock formations while generating drill cores as rock samples. More particularly, the present invention discloses a method and apparatus w...
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5012877 |
Apparatus and method for deflecting the drilling direction of a rotary drill string and drill bit through a borehole wall include an anchor, a housing, and a chute. The anchor anchors the apparatus in the borehole. The housing is connect...
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4852666 |
A directional guidance device, for deflecting a drill bit away from the longitudinal axis of a substantially horizontal section of a wellbore, takes advantage of gravitational force to move a deflector member therein between first and se...
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4768599 |
A bit assembly for undercutting a blind bore extending along a bore axis between an open outer end and a closed inner end and having a substantially cylindrical wall of a predetermned diameter centered on the bore axis and extending betw...
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4733732 |
In order to salvage a slot path on an offshore platform wherein the original conductor pipe has become clogged or otherwise rendered unusable, the original conductor is cut off below mudline, thereby leaving a stub forming a base upon wh...
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4527639 |
A system for the formation of a bore hole, particularly for use in enhancing the recovery of oil from an oil bearing underground formation using an assembly including a piston sliding in a guide tube. The forward end of the piston body t...
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4432422 |
A borehole guide for drilling interpenetrating boreholes which may be parallel to one another or inclined to one another. The borehole guide is clamped in position in an already drilled borehole by inflating an inflatable member. Thereaf...
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4397360 |
A method and apparatus for forming substantially horizontal drain holes into a subterranean formation from a substantially vertical cased wellbore. A casing anchor is set in the casing adjacent the formation and a whipstock is used to mi...
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