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| Number | Title | Issue Date |
| 8011453 | Drilling system and methods of drilling lateral boreholes A drilling system is presented for use in drilling lateral boreholes from a main borehole. The drilling system generally comprises a drilling machine, a drill string connected to the drilling machine so as to be driveable in an axial direction, and a guide connected... | 09/06/2011 |
| 7926592 | Steerable drilling system A steerable drilling system including a bias unit and a separator. The separator is arranged to remove particulate matter from the supply of pressurized drilling mud to the actuator of the bias unit. The separator includes a hydrocyclone located upstream of the actu... | 04/19/2011 |
| 7347284 | Apparatus and method for hard rock sidewall coring of a borehole The present invention is directed to an apparatus and method for coring a borehole in a hard rock sidewall of a well bore in a subterranean formation for testing purposes. The apparatus includes a drive motor for operation down hole, a flexible drive shaft coupled t... | 03/25/2008 |
| 7225887 | Method of drilling an ultra-short radius borehole A method of drilling a borehole into an earth formation using a drill string having an upper part and a lower part which is more flexible than the upper part, the method involving drilling a first section of the borehole, drilling a second section of the borehole fr... | 06/05/2007 |
| 7191829 | Gripper assembly for downhole tools A gripper assembly for anchoring a tool within a downhole passage and for possibly assisting movement of the tool within the passage. The gripper assembly includes an elongated mandrel and flexible toes that can be radially displaced to grip onto the surface of the ... | 03/20/2007 |
| 7178589 | Thru tubing tool and method A downhole tool is disclosed that functions as an expandable anchoring tool, capable of passing through a restricted wellbore diameter while in a collapsed position and thereafter translating to an expanded position for grippingly engaging a larger wellbore diameter... | 02/20/2007 |
| 6964303 | Horizontal directional drilling in wells 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 motor and associated batteries... | 11/15/2005 |
| 6955232 | Equipment for drilling vertical boreholes The invention relates to equipment for drilling a vertical borehole in hard ground, the equipment comprising: casing put successively into place in the borehole; a drilling machine having a rotary cutting head and ... | 10/18/2005 |
| 6923273 | Well system The drilling system includes a work string supporting a bottom hole assembly. The work string including lengths of pipe having a non-metallic portion. The work string preferably includes a composite coiled tubing having a fluid impermeable liner, multiple load carry... | 08/02/2005 |
| 6920945 | Method and system for facilitating horizontal drilling A method for facilitating horizontal drilling by positioning in a well casing a shoe defining a passageway extending from an upper opening in the shoe through the shoe to a side opening in the shoe. A rod is connected, through at least one block and pin assembly ope... | 07/26/2005 |
| 6889781 | Horizontal directional drilling in wells 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 motor and associated batteries... | 05/10/2005 |
| 6880631 | Whipstock casing milling system This invention relates to a whipstock casing milling system and, more particularly, to such a system in which a window mill is secured to a whipstock so that the system may be run into a well, set and operated to open a window in a casing during a single trip. The m... | 04/19/2005 |
| 6848504 | Apparatus and method to complete a multilateral junction An apparatus and method for connecting a lateral well bore to a vertical well bore using a tieback liner while providing full bore access in the vertical well bore casing. The tieback liner is rotationally aligned with respect to a window of the casing by locating a... | 02/01/2005 |
| 6843314 | Retrievable through-tubing whipstock apparatus having fluid-responsive pivotal anchoring members 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 is run through tubing and the ... | 01/18/2005 |
| 6786283 | Methods and associated apparatus for drilling and completing a wellbore junction 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 diverter is provided with an outer... | 09/07/2004 |
| 6761217 | Downhole latch assembly and method of using the same Downhole apparatus for locating equipment in a required depth and orientation within a well bore, the apparatus comprising a body and a latching member mounted on said body so as to be movable between a retracted position and an extended position, wherein the latchi... | 07/13/2004 |
| 6719045 | Whipstock assembly The apparatus is a whipstock assembly for use in a wellbore to form a lateral wellbore therefrom. In one aspect, a whipstock is attached to a cutting tool by a shearable connection whereby the whipstock and cutting tool assembly may be run into the wellbore simultan... | 04/13/2004 |
| 6712144 | Method for drilling multilateral wells with reduced under-reaming and related device 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, for example, epoxy which harden... | 03/30/2004 |
| 6668945 | Method and apparatus for milling a window in a well casing or liner A method and apparatus for milling a window in a downhole structure, such as a casing or a liner, includes a mandrel that supports milling elements arranged in a predetermined pattern. In one example, the milling elements are arranged in one or more conti... | 12/30/2003 |
| 6591905 | Orienting whipstock seat, and method for seating a whipstock The present invention provides an apparatus and methods for seating a whipstock. The apparatus comprises an expandable seat, or nipple, configured to receive a whipstock. The seat is run into a cased wellbore, and is set by expanding it into frictional co... | 07/15/2003 |
| 6588542 | Borehole tool actuating mechanism A borehole tool including a tool body having and an anchoring mechanism, the anchoring mechanism having a drive mechanism including a motor, drive shaft, and clutch; an anchor arm moveable between first and second positions relative to the tool body; a pu... | 07/08/2003 |
| 6588517 | Boring apparatus 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 second passageways... | 07/08/2003 |
| 6554062 | Anchor apparatus and method 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 orientation membe... | 04/29/2003 |
| 6550553 | Boring apparatus 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 perpendicular to the ... | 04/22/2003 |
| 6464002 | Whipstock assembly The present invention discloses a whipstock assembly for use in a wellbore to form a lateral wellbore therefrom. In one aspect, a whipstock is attached to a cutting tool by a shearable connection whereby the whipstock and cutting tool assembly may be run ... | 10/15/2002 |
| 6457525 | Method and apparatus for completing multiple production zones from a single wellbore Method and apparatus for producing multiple zones from a single wellbore wherein a hollow whipstock is used to complete a lateral into an upper zone which lies above a lower producing zone. The whipstock has openings through its tapered face which, in tur... | 10/01/2002 |
| 6419010 | Deviated borehole drilling assembly 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 a sloping face, c... | 07/16/2002 |
| 6419012 | Deviated borehole drilling assembly 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 a sloping face, c... | 07/16/2002 |
| 6378629 | Boring apparatus 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 perpendicular to the ... | 04/30/2002 |
| 6371221 | Coring bit motor and method for obtaining a material core sample The present invention provides an improved coring motor for use in obtaining a core sample from the side wall of a drilled bore hole. The present invention provides controllable rotation, extension and retraction of the coring bit relative to the side wal... | 04/16/2002 |
| 6334485 | Deviated borehole drilling assembly 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 a sloping face, c... | 01/01/2002 |
| 6315075 | Borehole logging tool with anchoring mechanism A borehole tool, such as a seismic shuttle-type logging tool, including a tool body having at least one sensor package and an anchoring mechanism, the anchoring mechanism having a drive mechanism including a motor, a drive shaft and a clutch; an anchoring... | 11/13/2001 |
| 6283208 | Orienting tool and method 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 a sloping face, c... | 09/04/2001 |
| 6260623 | Apparatus and method for utilizing flexible tubing with lateral bore holes An apparatus and method for utilizing a flexible tubing string (18) for forming and isolating a lateral entrance opening (23) to a lateral bore hole (25) from a main bore hole (10). A packer (38) mounted on the lower end of a tubular guide (40) has an elb... | 07/17/2001 |
| 6220372 | Apparatus for drilling lateral drainholes from a wellbore Apparatus for drilling lateral drainholes from a well casing comprises a flexible shaft having a bit at the lower end; the shaft extending through a shaft guide conduit anchored within the casing adjacent an oil-bearing formation. The "L" shaped guide con... | 04/24/2001 |
| 6202761 | Directional drilling method and apparatus 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 with a window mill. ... | 03/20/2001 |
| 6189616 | Expandable wellbore junction Multiple wellbores are interconnected utilizing a deflection device having a guide layer of lower hardness than the body of the deflection device, and a cutting tool having a guide portion and being operative to cut through the deflection device guide lay... | 02/20/2001 |
| 6186233 | Down hole assembly and method for forming a down hole window and at least one keyway in communication with the down hole window for use in multilateral wells 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 bit for milling th... | 02/13/2001 |
| 6073691 | Torque resistant retrievable whipstock A deflection apparatus is provided. In one described embodiment, the apparatus includes a torque resistant retrievable whipstock sealingly attached to a packer. The whipstock may be separated from the packer by applying an axial force to a first housing a... | 06/13/2000 |
| 6070667 | Lateral wellbore connection Apparatus and methods are provided for achieving a lateral wellbore connection in a subterranean well. In one described embodiment, a deflection device is rotatably attached to one orienting member and conveyed into a cementing shoe positioned in a parent... | 06/06/2000 |
