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| Number | Title | Issue Date |
| 8104549 | Activating device for a downhole tool An activating device is mounted in a drill string to control the activation and deactivation of an enlargement tool used for enlarging a bore hole. In order to assemble the activating device, pistons are mounted in passages and spline bars, in which plates are screw... | 01/31/2012 |
| 7891441 | Expandable downhole tool An expandable downhole tool such as an under-reamer or a stabiliser includes a mandrel mounted for linear slidable movement relative to a main body. The mandrel, together with one or more travel blocks, cause movement of a working component in an axial direction. On... | 02/22/2011 |
| 7681666 | Expandable reamer for subterranean boreholes and methods of use An expandable reamer apparatus and methods for reaming a borehole are disclosed, including at least one laterally movable blade carried by a tubular body selectively positioned at an inward position and an expanded position. The at least one laterally movable blade,... | 03/23/2010 |
| 7383900 | Drill bit and system for drilling a borehole A drill bit for drilling a borehole in an object, the drill bit having a central longitudinal axis and comprising a bit body provided with a central shank for connecting the drill bit to a drilling system. The drill bit further comprises at least one cutting arm, ea... | 06/10/2008 |
| 7370712 | Under reamer An under reamer for expanding a borehole through an earthen formation is taught. The under reamer includes: a mandrel including an end for connection into a drill string and an opposite end and a housing including an inner bore, telescopically disposed over the mand... | 05/13/2008 |
| 7360595 | Method and system for underground treatment of materials A method for underground treatment of subsurface materials comprises providing an injection pattern and a recovery pattern, the injection pattern and the recovery pattern located proximate to a subsurface treatment zone and at least one of the injection pattern and ... | 04/22/2008 |
| 7350596 | Methods and apparatus for expanding the diameter of a borehole A borehole reamer which may be deployed to a desired depth in an existing uncased borehole or below existing casing and used to substantially expand the diameter of the borehole. The diameter may be expanded by an amount that ranges from a fraction to a multiple of ... | 04/01/2008 |
| 7293617 | Polycrystaline diamond compact insert reaming tool A reaming tool including a body adapted to couple to a drill string at both axial ends thereof, the body including a plurality of reaming blades affixed at azimuthally spaced apart locations around the circumference of the body, wherein selected ones of the pluralit... | 11/13/2007 |
| 7293616 | Expandable bit An expandable drill bit for use with earth drilling equipment. The bit includes arms held in a closed position, so that the bit may be inserted through casing or a small bore hole. The arms are expandable to create an expanded drill bit having a crown profile common... | 11/13/2007 |
| 7264048 | Slot cavity A method for accessing a subterranean zone from the surface includes drilling a substantially vertical well bore from the surface to the subterranean zone and forming a slot cavity in the substantially vertical well bore proximate to the subterranean zone. The slot ... | 09/04/2007 |
| 7213644 | Cavity positioning tool and method In accordance with the teachings of the present invention, a method is provided for preventing formation of sludge in a subsurface cavity having particulate laden fluid disposed therein. The method includes positioning a downhole device having a fluid agitator into ... | 05/08/2007 |
| 7207390 | Method and system for lining multilateral wells In accordance with one embodiment of the present invention, a method for lining a lateral wellbore includes drilling a main wellbore extending from a surface to a subterranean zone, casing the main wellbore with a main casing having a plurality of lateral wellbore w... | 04/24/2007 |
| 7207395 | Method and system for testing a partially formed hydrocarbon well for evaluation and well planning refinement A method and system for testing a partially formed well includes forming a first well bore intersecting a subterranean formation. The first well bore includes a portion of a planned well having a first configuration. A production characteristic of the subterranean f... | 04/24/2007 |
| 7182157 | Enlarging well bores having tubing therein An underreamer for forming a cavity within a well bore includes a fluid motor having a first body and a second body arranged about a longitudinal axis. The first body is adapted to rotate about the longitudinal axis in relation to the second body when fluid is passe... | 02/27/2007 |
| 7178601 | Methods of and apparatus for casing a borehole Methods of and apparatus for drilling, casing and/or completing a borehole wherein one or more portions of the borehole are drilled into a formation at a single diameter along the entire length or depth of the or each portion of the borehole. An expandable tubular m... | 02/20/2007 |
| 7163063 | Method and system for extraction of resources from a subterranean well bore A method for stimulating production of resources from a coal seam includes forming a drainage well bore in the coal bed that has a first end coupled to a ground surface and a second end in the coal seam. The method further includes inserting a liner into the well bo... | 01/16/2007 |
| 7152679 | Downhole tool for deforming an object A downhole tool comprises a body defining a fluid chamber, a fluid outlet for directing fluid outwardly of the chamber, and an arrangement for producing a rapid reduction in the volume of the chamber, such that fluid in the chamber is displaced rapidly through the o... | 12/26/2006 |
| 7143848 | Downhole tool An expandable centralizer is disclosed having a body having a first portion of circular cross-section and a second portion of polyhedral cross-section. Centralizing members are arranged on the faces of the second portion which, in a first position, limit the diamete... | 12/05/2006 |
| 7143847 | Drilling apparatus Drilling apparatus, such as an underreamer (20) comprises a generally cylindrical tubular body (22) and two cutting blades (26, 27) pivotally mounted to the body and movable between a retracted position and an extended position. Each cutting bla... | 12/05/2006 |
| 7100687 | Multi-purpose well bores and method for accessing a subterranean zone from the surface A well system includes at least two well bores extending from a surface to a subterranean zone. Each of the two well bores is used to form a well bore pattern for the subterranean zone that intersects the other well bore and transports fluid from the subterranean zo... | 09/05/2006 |
| 7090038 | Bedrock drilling and excavating apparatus A bedrock drilling and excavating apparatus receives power from a rotational power source to drive a drill to strike and shatter bedrock under the gravity of the apparatus and reciprocal vibrations of a pneumatic unit located on the apparatus. The apparatus includes... | 08/15/2006 |
| 7073595 | Method and system for controlling pressure in a dual well system A method for controlling pressure of a dual well system includes drilling a substantially vertical well bore from a surface to a subterranean zone and drilling an articulated well bore from the surface to the subterranean zone using a drill string. The articulated w... | 07/11/2006 |
| 7048078 | Expandable underreamer/stabilizer A downhole tool that functions as an underreamer or as a stabilizer in an underreamed borehole. The tool includes one or more moveable arms disposed within a body having a flowbore therethrough in fluid communication with the wellbore annulus. The tool alternates be... | 05/23/2006 |
| 7048049 | Slant entry well system and method A system for accessing a subterranean zone from the surface includes an entry well bore extending down from the surface. A plurality of slanted well bores extend from the entry well bore to the subterranean zone. Drainage patterns extend from the slanted well bores ... | 05/23/2006 |
| 7036584 | Method and system for accessing a subterranean zone from a limited surface area A method and system for accessing subterranean resources from a limited surface area includes a first well bore extending from the surface to the target zone. The first well bore includes an angled portion disposed between the target zone and the surface to provide ... | 05/02/2006 |
| 7025154 | Method and system for circulating fluid in a well system A method for circulating drilling fluid in a well system includes drilling a substantially vertical well bore from a surface to a subterranean zone and drilling an articulated well bore from the surface to the subterranean zone. The articulated well bore is horizont... | 04/11/2006 |
| 7025137 | Three-dimensional well system for accessing subterranean zones A drainage system for accessing multiple subterranean zones from the surface includes an entry well extending from the surface. The system also includes two or more exterior drainage wells extending from the entry well through the subterranean zones. The exterior dr... | 04/11/2006 |
| 7004257 | Apparatus and methods for separating and joining tubulars in a wellbore The present invention provides methods and apparatus for cutting tubulars in a wellbore. In one aspect of the invention, a cutting tool having radially disposed rolling element cutters is provided for insertion into a wellbore to a predetermined depth where a tubula... | 02/28/2006 |
| 6991046 | Expandable eccentric reamer and method of use in drilling An expandable eccentric reamer for placement in a drill string up-hole of a conventional drill bit. The reamer blade is actuated by drilling fluid pressure to radially extend to a drill out diameter greater than a pass-through diameter. The reamer body is shaped to ... | 01/31/2006 |
| 6976533 | Method and system for accessing subterranean deposits from the surface Improved An improved method and system for accessing subterranean deposits from the surface that substantially eliminates or reduces the disadvantages and problems associated with previous systems and methods. In particular, the present invention provides an articul... | 12/20/2005 |
| 6976547 | Actuator underreamer An underreamer for forming a cavity from within a well bore includes a housing adapted to be disposed within the well bore. The underreamer includes an actuator partially slidably positioned in the housing. The actuator comprises a first portion and a second portion... | 12/20/2005 |
| 6973978 | Drilling tool having an expandable bladder and method for using same A drilling tool having an expandable bladder and a method for using the same are provided. The drilling tool includes a tool body having an interior cavity, a plurality of extendable arms coupled with the tool body, and an expandable bladder at least partially dispo... | 12/13/2005 |
| 6971459 | Stabilizing system and methods for a drill bit A drill bit stabilizing system comprising a body member having an axis and at least one recess formed in the body member housing at least one stabilizing member when in a first retracted position. The stabilizing member is positionable along a diagonal angle with th... | 12/06/2005 |
| 6964308 | Method of drilling lateral wellbores from a slant well without utilizing a whipstock In accordance with one embodiment of the present invention, a method for drilling a lateral wellbore from a slant well includes drilling the slant well below the surface of the earth such that the slant well is angled toward a first horizontal direction that coincid... | 11/15/2005 |
| 6964298 | Method and system for accessing subterranean deposits from the surface An improved method and system for accessing subterranean deposits from the surface substantially eliminates or reduces the disadvantages and problems associated with previous systems and methods. In particular, the present invention provides an articulated well with... | 11/15/2005 |
| 6962216 | Wedge activated underreamer An underreamer for forming a cavity from within a well bore includes a housing adapted to be disposed within the well bore. The underreamer includes at least one cutter, wherein each cutter has a first end and a second end. The first end of each cutter is pivotally ... | 11/08/2005 |
| 6959774 | Drilling apparatus A drilling apparatus for earth boring operations is of the type having cutter blades mounted on a support body at the lower end of a drill string and includes a novel arrangement of fluid bore sections for delivering fluid under pressure into fluid discharge passage... | 11/01/2005 |
| 6953096 | Expandable bit with secondary release device The present invention generally relates to an apparatus and method of forming a wellbore. In one aspect, an expandable bit for use in a wellbore is provided. The expandable bit includes a body and a blade assembly disposed on the body. The blade assembly is movable ... | 10/11/2005 |
| 6942030 | Three-dimensional well system for accessing subterranean zones A method for accessing a plurality of subterranean zones from the surface includes forming an entry well from the surface and forming two or more exterior drainage wells from the entry well through the subterranean zones. The exterior drainage wells each extend outw... | 09/13/2005 |
| 6939351 | Diskectomy instrument and method A diskectomy instrument includes an elongate body, a blade and a drive stem. The elongate body has a distal end, a proximal end, and a blade opening proximate the distal end. The blade is removably and movably mounted within the elongate body proximate the blade ope... | 09/06/2005 |
