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7467673 |
A rotary vector gear for controlling longitudinal axis offset about a central longitudinal axis is disclosed. The device uses single rotary motion through a rotary vector gear to produce hypotrochoidic offset similar to a flower petal an...
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7320373 |
An assembly for sidetracked drilling in a wall of a borehole previously drilled or cored in a formation includes a guide element and an expansible device fixed to the front end of the guide element operable to be selectively expanded by ...
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7188690 |
A drilling device for producing undercut holes. The drilling device includes a drilling tool having an axis of rotation and a cutting portion arranged such that the cutting portion drills a hole with a longitudinal axis that is radially ...
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7117958 |
An assembly for sidetracked drilling in a wall of a borehole previously drilled or cored in a formation includes a guide element and an expansible device fixed to the front end of the guide element operable to be selectively expanded by ...
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7066267 |
A splitter assembly 10 is positioned downhole within a conductor 50 for separating two or more tubular strings placed within the conductor. A splitter housing may include a first bore 26 and a second bore 28 for separating a firs...
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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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6945328 |
A lockable motor assembly for use in a well bore comprises a PDM motor having a rotor and a stator. A locking member has a splined projection which is received within a splined recess of the rotor and external splines which mate with spl...
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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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6769499 |
A drilling shaft deflection assembly for a drilling direction control device of the type comprising a rotatable drilling shaft and a housing for supporting a length of the drilling shaft for rotation therein. The deflection assembly is c...
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6648068 |
The side tracking system includes a window mill having a full diameter cutting surface and a reduced diameter tapered cutting surface and a whipstock having a ramp engaging the reduced diameter cutting surface. The materials of the whips...
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6588517 |
Apparatus for boring a hole from an inside of a casing outwardly at an angle relative to a longitudinal axis of the casing comprises a drill shoe having a longitudinal axis and being positionable in the casing, the shoe having first and ...
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6554062 |
The well reference apparatus and method of the present invention includes an anchor member with a orientation member preferably permanently installed within the borehole at a preferred depth and orientation in one trip into the well. The...
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6550553 |
Apparatus for boring a hole from an inside of a tube outwardly perpendicular to a longitudinal axis of the tube comprises a drill shoe having a longitudinal axis and being positionable in the tube, the shoe having an inlet, an outlet per...
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6488090 |
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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6412578 |
Apparatus for boring a hole from an inside of a casing outwardly at an angle relative to a longitudinal axis of the casing comprises a drill shoe having a longitudinal axis and being positionable in the casing, the shoe having first and ...
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6378629 |
Apparatus for boring a hole from an inside of a tube outwardly perpendicular to a longitudinal axis of the tube comprises a drill shoe having a longitudinal axis and being positionable in the tube, the shoe having an inlet, an outlet per...
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6318466 |
A method and apparatus that comprises releasably securing a milling tool to a deflecting tool using a securing mechanism. The securing mechanism comprises a member that is adapted to be broken by milling action of the milling tool. In ad...
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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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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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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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6050334 |
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6032740 |
A wellbore mill system having a first mill with a main body with a top end and a bottom end, milling structure on the main body, and a hook portion projecting from the bottom end of the main body for supporting at least one member below ...
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5915474 |
Multiple drain drilling and production apparatus (16) comprising a generally cylindrical body (18) adapted to be located within a well, and an orienting assembly (24, 28) adapted to be received in the body (18) to deviate a drill string ...
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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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5816324 |
A whipstock for guiding a cutting tool within a cased borehole. The whipstock having a guide surface for guiding engagement with the cutting tool. The guide surface having a first taper with the axis of the whipstock and a greater taper ...
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5785133 |
An assembly for drilling multiple laterals (26) from a borehole and into a formation includes a whipstock assembly having a radially movable lug (82). An elongate tubular secured within the borehole has one or more non-ferrous portions (...
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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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5431220 |
A starter mill adapted for use with a whipstock to mill a window through the casing of a well for deviating the direction of drilling. The starter mill includes a bearing nose which is utilized to indicate completion of the milling proce...
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5427179 |
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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5398754 |
A retrievable whipstock/anchor assembly is used to allow drilling of additional wellbores from an original or primary wellbore (which may be a highly deviated or horizontal open wellbore). The retrievable whipstock assembly is comprised ...
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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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5193620 |
A whipstock setting apparatus includes a whipstock with a mandrel secured thereto and depending therefrom. A cutter, or mill is connected to a work string and releasably connected to the whipstock. A packer assembly including a mechanica...
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5154231 |
A one-trip whipstock assembly incorporating a hydraulically set anchor which includes an interlock for maintaining the anchor in its set position upon interruption of hydraulic pressure. The anchor is connected to the lower end of the as...
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5115872 |
A directional drilling apparatus for drilling offset wellbores from a main borehole using a steering tool to orient a guidance tool body and wherein the tool body has a pair of angularly intersecting passageways including a first smaller...
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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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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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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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4420049 |
Directional drilling is carried out by orienting and positioning a whipstock having a curved guide surface at a predetermined rotational angle with respect to the desired azimuth so as to compensate for lateral deviation of the original ...
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3958649 |
Two methods and four mechanisms are disclosed for drilling at right angles to a vertical well at any location or depth in the well. The drilling mechanisms each comprises a flexible spring biased telescopic fluid conduit having a turbodr...
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3477524 |
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3339636 |
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3336990 |
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3242985 |
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3220495 |
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3191697 |
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3172488 |
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3123160 |
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3109501 |
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3075583 |
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