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| Number | Title | Issue Date |
| 8151910 | Drilling jar A bidirectional drilling jar, capable of repeated unidirectional firing, including a sliding assembly that is disposed in a sliding relation to the interior of a barrel assembly. A portion of the inner diameter of the barrel assembly forms a restricted barrel segmen... | 04/10/2012 |
| 7814995 | Hydraulic jar and an overpressure relief mechanism therefor A hydraulic jar for a drilling assembly is disclosed. In some embodiments, the hydraulic jar includes a tubular housing, a mandrel disposed in the housing, an annulus between the mandrel and the housing, and a pressure relief mechanism disposed in the annulus. The p... | 10/19/2010 |
| 7419015 | Rock drilling machine and axial bearing An axial bearing includes a first piston and a second piston. Axial contact surfaces between the pistons are arranged in the same pressure space. The same pressure fluid fed to the axial bearing acts on the contact surfaces and on working pressure surfaces of the pi... | 09/02/2008 |
| 7392857 | Apparatus and method for vibrating a drill bit In one aspect of the invention a drill bit comprises an axis of rotation a body and a working face. The body comprises a fluid passageway with a first seat and houses a jack element substantially coaxial with the axis. A stop element is disposed within the passagewa... | 07/01/2008 |
| 7377338 | Downhole percussion tool A pressure fluid actuated downhole percussion tool includes a reciprocating piston hammer with differential transverse pressure surfaces cooperable with a cylinder housing, a guide sleeve and a bit carried exhaust tube to form opposed pressure fluid chambers to whic... | 05/27/2008 |
| 7347287 | Hydraulic timing device A jar for use in a downhole environment comprises an hydraulic timing device which allows pressure to be controllably increased to a desired level and, on firing, a near-instantaneous release of that pressure, and which allows for selective bi-directional firing of ... | 03/25/2008 |
| 7299872 | Hydraulic-mechanical jar tool A jar mechanism comprises a housing having a fluid chamber therein, a piston encircled by an annular metering sleeve and movably mounted in the fluid chamber for movement between a first position and a second position, and a jar member moveably mounted in the housin... | 11/27/2007 |
| 7293614 | Multiple impact jar assembly and method A hydraulic jarring tool may be suspended in a well from a wireline, tubular string or drill string, and may be activated to release a tool stuck in the well, or to release the drill string. Each of an upper and lower jarring section include a housing, a piston, a p... | 11/13/2007 |
| 7290604 | Downhole tool with pressure balancing A downhole tool is provided that creates balancing forces that allow a tool such as ajar to continue to function when intrusion of gas into the fluid chamber of the jar occurs to cause gas pressure in the jar to exceed hydrostatic pressure. The excess pressure is ba... | 11/06/2007 |
| 7255182 | Ground drilling tool A back bit (20) is disclosed which is to used in conjunction with drilling equipment (10) which may include a derrick (11), a drilling pipe (12), a back head (14), a starting rod (13), and a cutting bit (15) mounted t... | 08/14/2007 |
| 7237626 | Tool module connector for use in directional drilling A tool module interconnect (10) for interconnecting to adjoining modules for insertion in a drill string features a system which permits making the electrical interconnection before assembly of the mechanical connections to interconnect the tool modules toget... | 07/03/2007 |
| 7234491 | Device for damping water hammer A device damps water hammers in hydraulic accumulators, in particular in piston accumulators. The device is embodied in the form of the accumulator component which operates as a throttle on a fluid flow and is inserted between internal elements (12) of the ac... | 06/26/2007 |
| 7219726 | Method and apparatus to vibrate a downhole component An apparatus for use in a wellbore comprises a housing having a longitudinal axis and a mechanism having one or more impact elements adapted to move along the longitudinal axis in an oscillating manner to impart a back and forth force on the housing to vibrate the h... | 05/22/2007 |
| 7172039 | Down-hole vane motor The present invention generally relates to an apparatus and method for use in a wellbore. In one aspect, a downhole tool for use in a wellbore is provided. The downhole tool includes a housing having a shaped inner bore, a first end and a second end. The downhole to... | 02/06/2007 |
| 7163058 | Hydraulic jar device An arrangement by a hydraulic jar device, especially for use in underground wells, where the jar device is installed in a pipe string led down into the well, and designed so that e.g. a stuck object in the well may be loosened or broken up by upward or downward perc... | 01/16/2007 |
| 7159673 | Drilling system with expandable sleeve A drilling system and method for drilling a borehole into an earth formation is provided. The drilling system has a drill string having a lower section provided with a sleeve which is radially expandable from a retracted mode in which the sleeve extends around the l... | 01/09/2007 |
| 7114970 | Electrical conducting system A generally tubular drill string has a conductive path over a plurality of drill pipe section (10). Each drill pipe section has a first end and a second end, and a wall, and the first end has a first radial sealing surfaces (11) and the second end has ... | 10/03/2006 |
| 7096980 | Rotary impact well drilling system and method A system and method for applying rotary percussive impacts to a drill bit, according to which an anvil is connected to the bit and a hammer is driven in one direction in the anvil when the bit encounters a relatively large load. Energy is stored during the movement ... | 08/29/2006 |
| 7073610 | Downhole tool A downhole tool for generating a longitudinal mechanical load. In one embodiment, a downhole hammer is disclosed which is activated by applying a load on the hammer and supplying pressurizing fluid to the hammer. The hammer includes a shuttle valve and piston that a... | 07/11/2006 |
| 7066251 | Hydraulic jar lock An internal, positive engagement lock that locks a tool, such as a hydraulic drilling jar, in the fully open position when the tool is racked back and when tripping in and out of the hole close to the surface. The lock mechanism is spring biased into a locked positi... | 06/27/2006 |
| 7066263 | Tension multiplier jar apparatus and method of operation A tension multiplier jar apparatus which multiplies the tension by a multiple factor using a compressible energizing fluid acting on differential areas to provide greater over-pull to jar objects in the well. There is first included an overall assembly which include... | 06/27/2006 |
| 7040421 | Liquid driven downhole drilling machine In a liquid downhole drilling machine, the guiding bushing (31) for the drill bit is rotatably journaled in the housing (11, 12) and, via a one-way coupling (29), coupled to a turning sleeve (22) that has axial ridges (24) that bou... | 05/09/2006 |
| 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 |
| 7017682 | Drill string shutoff valve A valve assembly connects into a drill string for opening and closing a passage within the drill string. The valve assembly has an inner valve member for opening and closing an inner passage of the drill string. The valve member moves between the open and closed pos... | 03/28/2006 |
| 7017681 | Device for performing hydrodynamic action on wellbore walls The proposed invention relates to wellbore technologies and is intended to produce action on productive rock. Device for hydrodynamic action on wall of a well comprising a casing jointed with the pipe conduit directly or via a roller support and inside of which the ... | 03/28/2006 |
| 6953098 | Hydraulic drill string accumulator A hydraulic accumulator for use in a drill string having a fluid passage for supply of fluid to a hydraulic drill string tool is provided. The accumulator comprises a body provided with connecting means for connecting the accumulator to the drill string and an expan... | 10/11/2005 |
| 6948560 | Jar for use in a downhole toolstring A jar (10), for use in a downhole toolstring comprising: a hollow housing (11); a jar mandrel (13); a latch sub (14); one or more latch keys (16); a cam surface (17); a chamber (23); a compression spring; and an adjus... | 09/27/2005 |
| 6907927 | Method and apparatus to vibrate a downhole component An apparatus for use in a wellbore comprises a housing having a longitudinal axis and a mechanism having one or more impact elements adapted to move along the longitudinal axis in an oscillating manner to impart a back and forth force on the housing to vibrate the h... | 06/21/2005 |
| 6729419 | Electro-mechanical drilling jar A drilling jar comprising a mandrel with a shoulder extending radially outward. The shoulder defines at least one openable and closeable orifice therethrough. An outer housing is slidably disposed about the mandrel to define an upper chamber above the shoulder and a... | 05/04/2004 |
| 6725932 | Down hole jar tool The down hole jar tool is a tool used to apply jarring forces to objects that may be obstructing the path of a down hole, or above-ground operation that requires a repetitive jarring action to dislodge or remove such objects. The tool is used by providing a linear i... | 04/27/2004 |
| 6655460 | 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 d... | 12/02/2003 |
| 6571870 | Method and apparatus to vibrate a downhole component An apparatus for use in a wellbore comprises a housing having a longitudinal axis and a mechanism having one or more impact elements adapted to move along the longitudinal axis in an oscillating manner to impart a back and forth force on the housing to vi... | 06/03/2003 |
| 6453997 | Hydraulically driven fishing jars A fishing jar is placed in a work string for delivering blows to a stuck object in a well. This fishing jar utilizes energy stored in the work string for delivering the blow, rather than having a main spring of its own. The fishing jar uses hydraulic pres... | 09/24/2002 |
| 6308779 | Hydraulically driven fishing jars A fishing jar is placed in a work string for delivering blows to a stuck object in a well. This fishing jar utilizes energy stored in the work string for delivering the blow, rather than having a main spring of its own. The fishing jar uses hydraulic pres... | 10/30/2001 |
| 6263986 | Hydraulic drilling jar A hydraulic drilling jar for use in association with downhole drilling and adaptable for connection between components of a drill string or the like. The hydraulic drilling jar generally comprises an outer generally hollow hydraulic housing, an inner mand... | 07/24/2001 |
| 6202767 | Double acting hydraulic jar A jar mechanism comprises an outer body member an, inner body member which is movably mounted on the outer body member, and a fluid chamber which is defined by the inner and outer body members. A resistance mechanism is in fluid communication with the flu... | 03/20/2001 |
| 6135217 | Converted dual-acting hydraulic drilling jar A jar up, bump down hydraulic drilling jar is described. A hydraulic tripping valve arrangement permits the storage of large amounts of static force before releasing a hammer to strike an anvil surface with substantial force. The hammer is positioned on t... | 10/24/2000 |
| 5984028 | Converted dual-acting hydraulic drilling jar A jar up, bump down hydraulic drilling jar is described. A hydraulic tripping valve arrangement permits the storage of large amounts of static force before releasing a hammer to strike an anvil surface with substantial force. The hammer is positioned on t... | 11/16/1999 |
| 5937956 | Ram boring machine A ram-boring machine with forward and reverse motion control which comprises a percussion piston that can be axially displaced in a tubular housing, a control tube that is arranged in the housing and controls the forward and reverse motion of the percussi... | 08/17/1999 |
| 5918689 | Jar enhancer A tool for enhancing the impact of either an upward or downward blow delivered by a single-acting jar to an object stuck in a well bore includes first and second tubular members telescopically arranged and vertically reciprocable with respect to one anoth... | 07/06/1999 |
