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| Number | Title | Issue Date |
| 7814993 | Downhole power generator and method A generator (10) is provided for positioning downhole in a drill string (12) to generate power powering one or more downhole tools (16). The generator includes a progressive cavity housing (28) and a progressive cavity rotor (30) w... | 10/19/2010 |
| 7562725 | Downhole pilot bit and reamer with maximized mud motor dimensions A drilling unit containing a combined pilot bit and reamer. The drilling unit includes a housing containing a mud motor and a pilot bit extending from its distal end. A reamer is mounted to the housing. The mud motor turns the pilot bit while the reamer is turned ei... | 07/21/2009 |
| 7549487 | Mandrel and bearing assembly for downhole drilling motor A downhole drilling motor beating assembly includes a tubular mandrel adapted to connect to a rotational power output of downhole motor. The bearing assembly includes a mandrel having: an upper end proximal to the downhole motor, a lower end with a pin connection di... | 06/23/2009 |
| 7404458 | Rotary percussive drilling device The device has a drill body, of generally cylindrical shape, connected by a flexible pipe to a high-pressure water pump placed on a low-height carrying vehicle. A striking piston is mounted movably, and is resiliently returned, in the drill body, and is subjected to... | 07/29/2008 |
| 7371034 | Drilling attachment A drilling attachment for use in wet and dry drilling operations includes a housing having first and second fluid conduits, and a drive shaft mounted within the housing and having fluid transmitting first and second end portions in fluid communication with a respect... | 05/13/2008 |
| 7353621 | Cleaning apparatus for vertical separator A cleaning apparatus for a material dryer may include an air source, a pulse nozzle selectively in fluid communication with the air source and located within a section of the solids outlet assembly, and a controller for controlling an air flow from the air source pe... | 04/08/2008 |
| 7337858 | Drill bit assembly adapted to provide power downhole In one aspect of the invention, a drill bit assembly has a body portion intermediate a shank portion and a working portion, the working portion having at least one cutting element. The working portion also has an opening to an axial chamber disposed in the body port... | 03/04/2008 |
| 7328755 | Hydraulic drill bit assembly In one aspect of the present invention a drill bit assembly has a body portion intermediate a shank portion and a working portion. The working portion has at least one cutting element and the body portion has at least a portion of a jackleg apparatus. The jackleg ap... | 02/12/2008 |
| 7318489 | Hydraulic motor arrangement and method of operating a hydraulic motor A hydraulic motor for use in subterranean drilling operations in which a drive fluid within a first reservoir is forced through the motor by a high pressure working fluid, such as drilling mud, the drive fluid entering a second reservoir upon exiting the motor. Upon... | 01/15/2008 |
| 7275605 | Rotatable drill shoe A rotatable drilling shoe attachable to a section of casing that allows for drilling and casing of a well bore in a single trip. The drilling shoe includes a fixed section and a rotatable section that has a drillable bit attached thereto. The drilling shoe further i... | 10/02/2007 |
| 7270196 | Drill bit assembly In one aspect of the present invention a drill bit assembly comprises a body portion intermediate a shank portion and a working portion. The working portion has at least one cutting element. The body portion has at least a portion of a reactive jackleg apparatus whi... | 09/18/2007 |
| 7198119 | Hydraulic drill bit assembly In one aspect of the present invention a drill bit assembly has a body portion intermediate a shank portion and a working portion. The working portion has at least one cutting element and the body portion has at least a portion of a jackleg apparatus. The jackleg ap... | 04/03/2007 |
| 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 |
| 7168507 | Recalibration of downhole sensors In downhole drilling tools, a first set of inexpensive and/or relatively small sensors that typically have lower accuracy and higher drift than conventional downhole sensors are located in the drill string adjacent to the bit. A second set of highly accurate sensors... | 01/30/2007 |
| 7168603 | Hydrogen powered fastener driving tool with onboard generator of hydrogen A hydrogen operated fastener driving tool assembly including a hydrogen generator that is an integral part of the driving tool assembly. The hydrogen generator can use chemicals to generate hydrogen or electrolysis. Additionally, the generator may be disposable. Wha... | 01/30/2007 |
| 7159676 | Fluid distributor device for down-hole-drills A fluid distributor device is for a percussive drill assembly including a generally tubular casing (2) having a longitudinal centerline and a piston (6) disposed within the casing so as to define a reservoir chamber (27) in the casing. The distr... | 01/09/2007 |
| 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 |
| 7096955 | Long duration fuel cell system A subsea fuel cell and system adapted for long duration use. The subsea fuel cell comprises a fuel cell stack and a water discharge system. In alternate embodiments, the subsea fuel cell can further comprise an impurity discharge system. ... | 08/29/2006 |
| 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 |
| 7069998 | Fuel cell for downhole and subsea power systems This invention relates to fuel cells, and in one embodiment, to fuel cells that are especially well suited for downhole use in oil and gas wells, and for subsea use in connection with offshore wells. ... | 07/04/2006 |
| 7063247 | Power driven equipment utilizing hydrogen from the electrolysis of water Applicant's novel invention relates to a novel hydrogen generator for supplying hydrogen to drive a hydrogen operated engine. The regulator can supply hydrogen to drive an engine for operating the cutter assembly of a lawnmower as well as supply the output of a hydr... | 06/20/2006 |
| 7040417 | Drilling systems The present invention discloses, in certain aspects, systems and methods for producing cyclical impacts and, in certain aspects for moving a drilling apparatus for drilling a borehole in a formation, the system in certain embodiments including a housing with a longi... | 05/09/2006 |
| 7003995 | Hydrotapping power unit A hydrotapping power unit is disclosed that is operable to hold a hydrotapping tool in a home position adjacent a part while the latter is being hydroformed in a die cavity, to then advance the tool to pierce a hole in the hydroformed part while the part remains in ... | 02/28/2006 |
| 6994175 | Hydraulic drill string A hydraulic drill string device can be in the form of a percussive hydraulic in-hole drilling machine that has a piston hammer (50) with an axial through hole (51) into which a tube (35) extends. The tube forms a channel for flushing fluid from ... | 02/07/2006 |
| 6959760 | Downhole pulser A power generator for use in a wellbore formed in an earth formation, including an internal combustion engine having a cylinder and a piston defining a combustion chamber in the cylinder, the engine being arranged to induce a reciprocating movement to the piston rel... | 11/01/2005 |
| 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 |
| 6910542 | Acoustic flow pulsing apparatus and method for drill string An underground drilling method and apparatus generates intense pressure pulses at a location at the surface. The pressure pulses propagate down through a drill string to a drill bit. The pulses may be generated by creating water hammer in flowing drilling mud. Inten... | 06/28/2005 |
| 6702045 | Drilling apparatus There is provided drilling apparatus (10) comprising a hammer casing (11), a free piston motor piston guide and porting sleeve (12), a drive sub (13), a drill bit (15) splined by shank (16) to the drive sub (13). Below the splined portion (17) the drive s... | 03/09/2004 |
| 6568485 | Stalled motor by-pass valve Between a drilling motor and the upwardly continuing drill string a housing contains a speed sensor rotationally connected to the motor rotor. Motor speed is sensed and if rotating at a rate less than a selected speed, a cooperating by-pass valve opens to... | 05/27/2003 |
| 6516897 | Self-contained excavator and anchor apparatus and method A self-contained excavation device, with specific application as a beach umbrella excavator and anchor apparatus, includes a cutting head with a stepped cutting edge to penetrate thin shell layers, recesses defining anchor shelves to prevent pullout from ... | 02/11/2003 |
| 6464023 | Hydraulic in-the-hole percussion rock drill A hydraulic percussion drill includes a piston hammer disposed in a cylinder for reciprocating movement in response to pressure fluid acting continuously on one transverse face of the piston hammer and in response to valving of pressure fluid alternately ... | 10/15/2002 |
| 6374924 | Downhole drilling apparatus A downhole drilling apparatus for interconnection in a casing or liner string having a drill bit disposed thereon for enabling the drilling of intersecting wellbores without removal of the drill bit is disclosed. In a disclosed embodiment, the apparatus c... | 04/23/2002 |
| 6293357 | Hydraulic in-the-hole percussion rock drill A hydraulic reciprocating piston hammer percussion drill includes an elongated piston hammer having opposed reduced diameter shank portions and disposed in a cylinder for reciprocating movement in response to pressure fluid acting continuously on one tran... | 09/25/2001 |
| 6073708 | Downhole mud pressure intensifier A mud pressure intensifier works with existing conventional drill strings without requiring special equipment or drilling fluids. The intensifier is self-contained and is located in the drill string between the drill bit and the rest of the string. The ro... | 06/13/2000 |
| 6050349 | Hydraulic system for mud pulse generation A hydraulic system for supplying hydraulic fluid for operating a mud pulse generator includes an accumulator that has a reservoir. The accumulator is arranged to maintain the fluid pressure in the reservoir. The system also has a pressure operated, one wa... | 04/18/2000 |
| 5984026 | Pressure converter A pressure converter for mounting above the drill bit on a drill pipe for generating a higher fluid pressure in a portion of a drilling fluid flow, comprises a piston moveable in a cylinder. The piston has a large piston area and an opposite small piston ... | 11/16/1999 |
| 5941325 | Pressure converter (B) Pressure converter for mounting above the drill bit at the lower end of a drill pipe for generating a higher fluid pressure in a portion of a drilling fluid flow, including a piston which is moveable in a cylinder. The piston has a large piston area which... | 08/24/1999 |
| 5934392 | Pressure converter Pressure amplifier mounted at the lower end of a drill pipe for deep drilling to generate an increased fluid pressure. A piston with a pressure stroke and a return stroke between end positions in a cylinder has a large piston area which during the pressur... | 08/10/1999 |
| 5890547 | Pressure converter Pressure amplifier for mounting above the drill bit at the lower end of a drill pipe for generating an increased fluid pressure in a drilling fluid flow, for example for obtaining an increased drilling effect. A reciprocating piston in a cylinder is desig... | 04/06/1999 |
| 5662180 | Percussion drill assembly A compressor piston divides a first compartment into two compression chambers, while a hammer piston divides a second compartment into two drive chambers, each of the compression chambers being connected to a respective one of the drive chambers to form a... | 09/02/1997 |
