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| Number | Title | Issue Date |
| 7367143 | Cutter and method for working the soil A cutter for working the soil includes a cutting frame, at least two cutting wheels that are supported on the cutting frame in a rotatably drivable manner about parallel axes of rotation, and an adjusting device, The adjusting device functions to adjust the center d... | 05/06/2008 |
| 7357458 | Boring rig A boring rig (14) for underground boring for excavating purposes and including a substructure (21, 22), a propulsion device, a stabilizing device (31, 32, 35, 36, 37, 38, 39, 42), and a boring unit (20) having a cutter head (29) an... | 04/15/2008 |
| 7325327 | Method and apparatus for measuring angular or linear displacement An apparatus and method are disclosed for measuring the angular or linear displacement of an object. That displacement is transmitted to a movable conductive member, which, in response thereto, is moved to a position at which it electrically contacts one of a plural... | 02/05/2008 |
| 7293615 | Earth boring system An earth boring apparatus for sinking shafts and removing shaft material from the shaft, the apparatus having at least two decks; hydraulic means for allowing movement of the decks relative to one another; releasable anchoring means associated with the decks for eng... | 11/13/2007 |
| 7273109 | Puller-thruster downhole tool A method and apparatus for propelling a tool having a body within a passage. The tool includes a gripper including at least a gripper portion which can assume a first position that engages an inner surface of the passage and limits relative movement of the gripper p... | 09/25/2007 |
| 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 |
| 7188568 | Self-propelled vehicle for movement within a tubular member A self-propelled vehicle (20) for movement within a tubular member (22) includes propulsion mechanisms (28) distributed about a core element (24). Each of the propulsion mechanisms (28) includes a drive belt (28). A first pu... | 03/13/2007 |
| 7185716 | Electrically sequenced tractor A downhole drilling tractor for moving within a borehole comprises a tractor body, two packerfeet, two aft propulsion cylinders, and two forward propulsion cylinders. The body comprises aft and forward shafts and a central control assembly. The packerfeet and propul... | 03/06/2007 |
| 7185714 | Traction control for downhole tractor Apparatus, system and methods useful for controlling the traction of a downhole tractor in a borehole include the capability of repeatedly adjusting the normal force applied to at least one component that causes movement of the tractor in the borehole. ... | 03/06/2007 |
| 7174974 | Electrically sequenced tractor A downhole drilling tractor for moving within a borehole comprises a tractor body, two packerfeet, two aft propulsion cylinders, and two forward propulsion cylinders. The body comprises aft and forward shafts and a central control assembly. The packerfeet and propul... | 02/13/2007 |
| 7168510 | Electrical transmission apparatus through rotating tubular members The present invention provides an apparatus for the communication of power or data signals across the rotating gap of two tubular members, such as the stator and rotor of a mud motor, and between said rotating members of a drill string through inductive couplers loc... | 01/30/2007 |
| 7156181 | Puller-thruster downhole tool A method and apparatus for propelling a tool having a body within a passage. The tool includes a gripper including at least a gripper portion which can assume a first position that engages an inner surface of the passage and limits relative movement of the gripper p... | 01/02/2007 |
| 7147068 | Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells The steel drill string attached to a drilling bit during typical rotary drilling operations used to drill oil and gas wells is used for a second purpose as the casing that is cemented in place during typical oil and gas well completions. Methods of operation are des... | 12/12/2006 |
| 7143843 | Traction control for downhole tractor Apparatus, system and methods useful for controlling the traction of a downhole tractor in a borehole include the capability of repeatedly adjusting the normal force applied to at least one component that causes movement of the tractor in the borehole. ... | 12/05/2006 |
| 7134512 | Method of downhole drilling and apparatus therefor A downhole drilling apparatus suspended by tubing includes a drill bit driven by an electric motor powered by a cable means. The motor is mounted upon a hollow shaft which allows fluid to pass through, so that a fluid circuit along the tube and back along the annulu... | 11/14/2006 |
| 7114271 | Cutting tool for digging trenches, and enabling the cutter head to be changed quickly The invention relates to a cutting tool for digging vertical trenches, the tool comprising: a jib (B); a cutter structure (34; C) suspended from the jib via a cable; a plurality of cutter me... | 10/03/2006 |
| 7090037 | Device for anchoring a drill string in a borehole A device for anchoring a drill string in a borehole an anchoring member connected to the drill string, the anchoring member being movable between a retracted position in which the anchoring member is retracted from the borehole wall, and, an extended position in whi... | 08/15/2006 |
| 7086485 | Directional casing drilling A directional drilling system, including a casing string, a casing latch disposed inside the casing string proximate a lower end of the casing string and coupled to the casing string, a rotary steerable system disposed inside the casing string and coupled to the cas... | 08/08/2006 |
| 7070359 | Microtunneling systems and methods of use A tunneling system including a tunneling apparatus including a cutting structure for forming a borehole and at least one linkage section for transmitting a force generally toward the cutting structure is disclosed. A method of disposing a casing string within a subt... | 07/04/2006 |
| 7059417 | Puller-thruster downhole tool A method and apparatus for propelling a tool having a body within a passage. The tool includes a gripper including at least a gripper portion which can assume a first position that engages an inner surface of the passage and limits relative movement of the gripper p... | 06/13/2006 |
| 7055625 | Self-propelled instrumented deep drilling system An autonomous subsurface drilling device has spaced-apart forward and rearward “feet” sections coupled to an axial thruster mechanism between them to operate using an inchworm method of mobility. In one embodiment, forward and rearward drill sections are carried... | 06/06/2006 |
| 7056065 | Device and method for changing lines A device for replacing lines without excavation including an annular overdrilling head and a drive for rotating a front module arranged on the drilling head. ... | 06/06/2006 |
| 7036610 | Apparatus and method for completing oil and gas wells A method of drilling and completing a wellbore in a geological formation to produce hydrocarbons from a well comprising at least the following four steps: drilling the well with a retrievable drill bit attached to a casing; removing the retrievable drill bit from th... | 05/02/2006 |
| 7025130 | Methods and apparatus to control downhole tools The present invention generally provides a downhole tool with an improved means of transmitting data to and from the tool through the use of wired pipe capable of transmitting a signal and/or power between the surface of the well and any components in a drill string... | 04/11/2006 |
| 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 |
| 6935423 | Borehole retention device A borehole retention assembly for anchoring a well tool within a wellbore including a gripping assembly and an actuation assembly. The gripping assembly includes expandable members such that upon expanding the expandable members, the gripping assembly engages the wa... | 08/30/2005 |
| 6926102 | Subsea controlled milling Subsea controlled milling apparatus and methods. In a described embodiment, a method of controlling displacement of a cutting device conveyed on a tubular string in a subterranean well includes the steps of: interconnecting an apparatus in the tubular string, the ap... | 08/09/2005 |
| 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 |
| 6763899 | Deformable blades for downhole applications in a wellbore A method and apparatus for controlling fluidic torque in a downhole tool is provided. One or more rotatable components of the downhole tool comprise a deformable material, such as rubber or SMA, selectively deformable in response to the flow of fluid through the dow... | 07/20/2004 |
| 6758289 | Method and apparatus for hydrocarbon subterranean recovery Enhanced horizontal drilling systems and methods encompass the production of crude oil from wells drilled from a subterranean production facility. This approach has the location of the well head below the oil reservoir to improve flow rate and recovery due to the co... | 07/06/2004 |
| 6758279 | Puller-thruster downhole tool A method and apparatus for propelling a tool having a body within a passage. The tool includes a gripper including at least a gripper portion which can assume a first position that engages an inner surface of the passage and limits relative movement of the gripper p... | 07/06/2004 |
| 6607607 | Coiled tubing wellbore cleanout Method and apparatus for substantially cleaning fill from a borehole, variously including in preferred embodiments disturbing, particulate solids of fill while RIH, entraining particulates while POOH, jetting downhole while RIH and jetting uphole while PO... | 08/19/2003 |
| 6601652 | Puller-thruster downhole tool A method and apparatus for propelling a tool having a body within a passage. The tool includes a gripper including at least a gripper portion which can assume a first position that engages an inner surface of the passage and limits relative movement of th... | 08/05/2003 |
| 6293356 | Method of and system for optimizing rate of penetration in drilling operations A method of and system for optimizing bit rate of penetration while drilling substantially continuously determine an optimum weight on bit necessary to achieve an optimum bit rate of penetration based upon measured conditions and maintains weight on bit a... | 09/25/2001 |
| 6286592 | Puller-thruster downhole tool A method and apparatus for propelling a tool having a body within a passage. The tool includes a gripper including at least a gripper portion which can assume a first position that engages an inner surface of the passage and limits relative movement of th... | 09/11/2001 |
| 6192998 | Method of and system for optimizing rate of penetration in drilling operations A method of and system for optimizing bit rate of penetration while drilling substantially continuously determine an optimum weight on bit necessary to achieve an optimum bit rate of penetration based upon measured conditions and maintains weight on bit a... | 02/27/2001 |
| 6102138 | Pressure-modulation valve assembly A drillstring pressure-modulation valve which is usable in combination with a downhole drilling motor and a drillstring thruster to compensate for changes in pressure drop through the drilling motor which normally occur during drilling. When conditions ch... | 08/15/2000 |
| 6026912 | Method of and system for optimizing rate of penetration in drilling operations A method of and system for optimizing bit rate of penetration while drilling substantially continuously determines an optimum weight on bit necessary to achieve an optimum bit rate of penetration based upon measured conditions and maintains weight on bit ... | 02/22/2000 |
| 6015018 | Method and apparatus for moving a piston An apparatus for creating a pulling force on a bottom hole assembly contained within a bore hole is disclosed. Generally, the apparatus comprises a housing, a piston having a first section and a second section, and a venturi member, operatively associated... | 01/18/2000 |
| 6003606 | Puller-thruster downhole tool A method and apparatus for propelling a tool having a body within a passage. The tool includes a gripper including at least a gripper portion which can assume a first position that engages an inner surface of the passage and limits relative movement of th... | 12/21/1999 |
