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| Number | Title | Issue Date |
| 7997357 | System and method for damping vibration in a drill string A system for damping vibration in a drill string can include a valve assembly having a supply of a fluid, a first member, and a second member capable of moving in relation to first member in response to vibration of the drill bit. The first and second members define... | 08/16/2011 |
| 7654344 | Torque converter for use when drilling with a rotating drill bit A torque converter for use in drilling with a rotating drill bit, the purpose of the torque converter being to absorb impacts and bring about an axial movement of the drill bit when the torque exceeds a predetermined value. For this purpose the torque converter is c... | 02/02/2010 |
| 7377339 | System and method for damping vibration in a drill string A system for damping vibration in a drill string can include a valve assembly having a supply of a fluid, a first member, and a second member capable of moving in relation to first member in response to vibration of the drill bit. The first and second members define... | 05/27/2008 |
| 7341116 | Drilling efficiency through beneficial management of rock stress levels via controlled oscillations of subterranean cutting elements A device and system for improving efficiency of subterranean cutting elements uses a controlled oscillation super imposed on steady drill bit rotation to maintain a selected rock fracture level. In one aspect, a selected oscillation is applied to the cutting element... | 03/11/2008 |
| 7287603 | Combined casing expansion/casing while drilling method and apparatus A drilling assembly (2) comprises upper (4) and lower (6) drill strings with a fluid passage (80) therethrough for distributing fluid to a bottom hole assembly (10). The upper drill string (4) has an upper end (11) co... | 10/30/2007 |
| 7044240 | Torque absorber for downhole drill motor A torque absorber is disposed on a drill string near the motor. The torque absorber automatically adjusts the weight on a drill bit and reduces the likelihood of motor stall caused by resistance to drill bit rotation. The torque absorber includes an upper unit assem... | 05/16/2006 |
| 6955231 | Tool for changing the drilling direction while drilling A tool adapted for changing the direction of drilling during drilling. The drilling equipment used in the drilling includes a drill string, a bent sub, a drill motor, and a drill bit. The tool is positioned between the drill string and the bent sub, includes housing... | 10/18/2005 |
| 6951082 | Drilling rig with torque carrier A telescoping rig with an upper mast telescopingly received within a lower mast. A torque carrier is formed of an upper part suspended within the upper mast and a lower part attached to the lower mast. The lower part may be secured to the upper part when the rig is ... | 10/04/2005 |
| 6854538 | Rock drill A rock drill includes a shank. A percussion piston is arranged to hit the back end of the shank. Further, a pulling element is arranged around the shank, to which a pulling force can be directed in such a manner that the shank can, by the pulling force, be moved tow... | 02/15/2005 |
| 6543556 | Abnormal torque absorber for drilling A torque shock absorber apparatus (39) comprised of a mandrel (2) and cylinder (8) with torque absorbing mechanism (8-12, 27) to absorb excessive torque while permitting the transmission of rotational energy to the drill string is connected in the drill s... | 04/08/2003 |
| 6439318 | Downhole apparatus A downhole drilling assembly (10) comprises a body (11) for mounting on a drillstring, the body defining a fluid conduit. A drilling fluid driven motor (12) is mounted in the body (11) and is coupled to a flow restricting device (14) axially movably mount... | 08/27/2002 |
| 6308940 | Rotary and longitudinal shock absorber for drilling A rotary and longitudinal shock absorbing apparatus with an mandrel therein is connected to a drill string assembly to absorb abnormal longitudinal shocks and abnormal torsional shocks by cooperating hydraulic and mechanical means, while allowing communic... | 10/30/2001 |
| 5894896 | Orienting tool for coiled tubing drilling There is described an improved apparatus for azimuthal orientation of a tool in a wellbore. The apparatus comprises a tubular housing, a mandrel rotatably supported in the tubular housing and extending therefrom for connection to a tool for rotation there... | 04/20/1999 |
| 5775444 | Drill string orienting motor The housing of the orienting motor serves as a length of pipe string and rotates the lower end relative to the upper end. Rotation is in preselected increments each time the rate of fluid flow in the pipe string is changed between preselected limits. Once... | 07/07/1998 |
| 5673765 | Downhole drilling subassembly and method for same A downhole drilling subassembly for use with a pressurized fluid carrying drill string extending from a well head and having a portion down a bore hole. A first tubular housing is provided which is adapted to couple to the portion of the drill string in t... | 10/07/1997 |
| 5669457 | Drill string orienting tool A drill string orienting tool for insertion into a well bore includes a housing that has a plurality of inwardly projecting splines. A mandrel is disposed within the housing. The orienting tool has two operating positions, a running position, and an orien... | 09/23/1997 |
| 5476148 | Tool for maintaining wellbore penetration A tool for connection in a wellbore drill string for maintaining penetration of a drilling bit attached to the drill string when the drill string becomes stuck or hung up during drilling operations. The tool has a telescoping outer member and inner member... | 12/19/1995 |
| 5454420 | Method and apparatus for rotating downhole tool in wellbore A wellbore operation in which a downhole tool is given rotary motion without rotating the tubing string to which it is attached. A "Yankee screwdriver" type of connecting element is used to connect a downhole tool to a tubing string so that compressive fo... | 10/03/1995 |
| 5445230 | Downhole drilling subassembly and method for same A downhole drilling subassembly for use with a pressurized fluid carrying drill string extending from a well head down to a bottom of a bore hole. The drill string includes upper and lower sections disposed at an angle relative to each other and having re... | 08/29/1995 |
| 5404944 | Downhole makeup tool for threaded tubulars A downhole tool for making up threaded connections between lower and upper tubulars within a well bore includes a lower anchoring member, an upper anchoring member, and a drive member including a movable piston assembly. A plurality of straight splines on... | 04/11/1995 |
| 5375670 | Drill string component for drilling with a liquid driven drilling machine Drill string component for use at drilling with a liquid driven down-the-hole drilling machine (1) comprising three coaxial tubes (2,4,6) for forming channels for supply of driving medium to the down-the-hole drilling machine, return of the driving medium... | 12/27/1994 |
| 5339913 | Well orienting tool and method of use A down hole well tool shown in the form of an orienting tool (OT) has mandrel (16) with helical grooves (16a) thereon and a tubular member (20) which telescopically receives the mandrel (16). Keys (22) on tubular member (22) engage in the grooves (16a). M... | 08/23/1994 |
| 5316094 | Well orienting tool and/or thruster An orientation mandrel rotatable in an orientation body for providing rotational orientation and actuated by a hydraulic piston controlling the position of a helix. A thruster may be connected to the orientation mandrel and is adapted to hydraulically eng... | 05/31/1994 |
| 5269385 | Adjustable bent housing II There is described an adjustable bent housing comprising a cylindrical housing having an uphole and a downhole end and a bore formed therethrough, the bore being divided into uphole and downhole portions axially offset to one another, and a tubular mandre... | 12/14/1993 |
| 5259467 | Directional drilling tool A fluid powered incremental stepping motor arranged to serve as a length of pipe string has a body that includes an arbor end with an arbor of reduced diameter extending into a bore of a housing end bearingly supported for rotation about the arbor. An ann... | 11/09/1993 |
| 5215151 | Method and apparatus for drilling bore holes under pressure A method and apparatus for directional drilling to recover hydrocarbons, thermal energy, or the like, by using coiled tubing while the well is under pressure so that high density drilling fluids to control the subsurface pressures during drilling are not ... | 06/01/1993 |
| 5156223 | Fluid operated vibratory jar with rotating bit A downhole oil well tool uses impact, reciprocal drilling and an improved rotating bit or like working member, receiving both fluid pressure and weight from an elongated pipe string with a flow bore in order to drive the tool. A valve within tool housing ... | 10/20/1992 |
| 5038874 | Drill bit having a flushing medium channel A drill string for top hammer drilling includes a drill bit, a set of central rod members for transferring impact energy to the drill bit, and a set of tubular members surrounding the rod members for transferring rotation to the drill bit. The rod members... | 08/13/1991 |
| 4958691 | Fluid operated vibratory jar with rotating bit A downhole oil well tool uses impact, reciprocal drilling and an improved rotating bit or like working member, receiving both fluid pressure and weight from an elongated pipe string with a flow bore in order to drive the tool. A valve within tool housing ... | 09/25/1990 |
| 4884643 | Downhole adjustable bent sub A downhole adjustable bent sub is provided for use in a drilling process in which a drill bit is subjected to a drilling force. The bent sub has a tubular housing and a tubular mandrel. The tubular housing has a bend along its length to define an upper pa... | 12/05/1989 |
| 4800966 | Devices for drilling branched wells A device for drilling lateral boreholes from a cased parent well comprises selecting and coupling means adapted to cooperate with a deflection unit placed within the parent well. The selecting and coupling means are mounted at the lower end of an extensio... | 01/31/1989 |
| 4600062 | Shock absorbing drilling tool A well tool carried in a drill string for maintaining bottom hole contact while absorbing angular and axial shock forces of a rotating drill bit. The tool has an elongated body with pipe joint ends and includes a tubular mandrel slideably mounted within a... | 07/15/1986 |
| 4494617 | Shaft boring machine A machine for boring a shaft in earth strata or the like. An annular support ring means having an outside diameter approximately equal to the diameter of the shaft which is selectively engageable or disengageable with the shaft wall by the use of clamping... | 01/22/1985 |
| 4463220 | Drill bit for forming a fluid cushion between the side of the drill bit and the side wall of a bore hole In a drill bit comprising a body having a channel therethrough for carrying drilling fluid for injection into a bore hole through a nozzle at one end thereof and a cutting head mounted in the body and contacting the bottom of the bore hole. The improvemen... | 07/31/1984 |
| 4443206 | Well tool A well tool carried in a drill string for maintaining bottom hole contact while absorbing angular and axial shock forces of a rotating drill bit. The tool has an elongated body with pipe joint ends and includes a tubular mandrel rotationally and slideably... | 04/17/1984 |
| 4331207 | Device for reversing the direction of flow of a fluid at the level of a drill bit This device, positioned above the drill bit, comprises a body provided with an axial bore communicating with the drill string and distribution means, controlling the direction of flow of the flushing fluid, slidably mounted in said bore and having two pos... | 05/25/1982 |
| 4310057 | Apparatus for extracting subterranean gas samples An apparatus for extracting subterranean gas samples including an elongated stiff rod having a gas passageway from near the bottom end to near the top end, a means for driving the rod into the earth whereby the lower end is positioned below the earth's su... | 01/12/1982 |
| 4300636 | Constant bottom contact tool A drill string in a well bore has a mandrel extending longitudinally thereof adjacent the lower end of the drill string with a drill bit connected to the mandrel. Longitudinally extending helical groove means are provided in the mandrel and roller means a... | 11/17/1981 |
| 4270620 | Constant bottom contact tool A drill string in a well bore has a mandrel extending longitudinally thereof adjacent the lower end of the drill string with a drill bit connected to the mandrel. Longitudinally extending helical groove means are provided in the mandrel and roller means a... | 06/02/1981 |
| 4183415 | Drilling apparatus In apparatus for drilling a hole in the ground comprising tubing for shoring up the walls of the drilled hole and a drilling member comprising a pneumatic percussion hammer having an eccentric cutting edge, the drilling member extending in the tubing and ... | 01/15/1980 |
