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| Number | Title | Issue Date |
| 8066086 | Sleeve arrangement Sleeve arrangement for a drill rig, especially adapted for damping sound and sealing to the ground, said drill rig comprising a feed beam (4) having a drill end (41) and a rear end (42), said feed beam (4) comprising a first and a second ... | 11/29/2011 |
| 7878272 | Forced balanced system A downhole tool including a purely mechanical stabilizer is disclosed. The stabilizer includes a plurality of fixed blades, each of which includes at least one automatically extendable and retractable piston. In use, a balance of forces determines the radial positio... | 02/01/2011 |
| 7861804 | Sleeve arrangement Sleeve arrangement for a drill rig, especially adapted for damping sound and sealing to the ground, said drill rig comprising a feed beam (4) having a drill end (41) and a rear end (42), said feed beam (4) comprising a first and a second ... | 01/04/2011 |
| 7845434 | Technique for drilling straight bore holes in the earth A stabilizer assembly is at least 12′ long and preferably at least 14′ long and is used to drill a straight bore hole in the earth. A central passage through the assembly closely follows a centerline as may be determined by measuring the wall thickness of the tu... | 12/07/2010 |
| 7412761 | Method of creating a sleeve on tubing A method and apparatus for the application of a sleeve upon a tubular, such as a pipe string, used in downhole applications, for example in oil and gas exploration or recovery. A mould is located around the tubular into which a composite material is injected. The ma... | 08/19/2008 |
| 7392861 | Stabilizer for a rod, particularly a string of drilling rods Stabilizer (1) designed to be slid onto a rod (2), particularly a string of drilling rods. It comprises at least one elastic part (4) that can deform when the stabilizer (1) is held in an initial position in compression against a shoulder... | 07/01/2008 |
| 7383898 | Inner and outer motor with eccentric stabilizer A downhole motor arrangement for a directional drilling comprises a first motor component (22), a second motor component (24) encircling at least part of the first motor component (22), and a third motor component (26) encircling at least... | 06/10/2008 |
| 7347286 | Drill string valve assembly A drill string valve assembly includes a tubular valve body, including an outer surface and an inner bore for housing a valve mechanism to control fluid flow through the bore; and an axial load support releasably securable to the outer surface of the valve body, the... | 03/25/2008 |
| 7267185 | Bit retainer system A bit retainer system comprising a casing, a driver sub adapted to be disposed around a shank of a bit, and a bit retainer. The driver sub comprises a threaded connector, a threaded pin end configured to engage with the hammer case, and a stop. The bit retainer comp... | 09/11/2007 |
| 7267184 | Modular housing for a rotary steerable tool According to one embodiment of the invention, a rotary steerable tool includes a drive shaft configured to be coupled to a drill string at an upper end thereof and configured to be coupled to a drilling tool at a lower end thereof. A middle portion of the drive shaf... | 09/11/2007 |
| 7253671 | Apparatus and method for compensating for clock drift in downhole drilling components A precise downhole clock that compensates for drift includes a prescaler configured to receive electrical pulses from an oscillator. The prescaler is configured to output a series of clock pulses. The prescaler outputs each clock pulse after counting a preloaded num... | 08/07/2007 |
| 7234517 | System and method for sensing load on a downhole tool A system and method for determining load on a downhole tool according to which one or more sensors are embedded in one or more components of the tool or in a material on one or more of the components. The sensors are adapted to sense load on the components. ... | 06/26/2007 |
| 7225887 | Method of drilling an ultra-short radius borehole A method of drilling a borehole into an earth formation using a drill string having an upper part and a lower part which is more flexible than the upper part, the method involving drilling a first section of the borehole, drilling a second section of the borehole fr... | 06/05/2007 |
| 7204325 | Spring mechanism for downhole steering tool blades A steering tool for use in a well bore is disclosed. The tool includes at least one extendable and retractable blade deployed thereon. The blade is elastically spring biased radially inwards towards the tool such that upon removal of an actuating force, the blade re... | 04/17/2007 |
| 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 |
| 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 |
| 7128170 | Adjustable stabiliser for directional drilling A stabiliser (10) has a body (12) having a through-bore (16). A mandrel (14), also having a through-bore (20), is axially slidable in the body bore to actuate and de-actuate the tool. A step (64) in the body defines annular ... | 10/31/2006 |
| 7096940 | Centralizer system for insulated pipe A centralizer system is provided for use in a marine riser system with an insulated pipe, which may be a titanium stress joint. The centralizer system utilizes one or more centralizers mounted such that insulation material is provided in an annulus between the one o... | 08/29/2006 |
| 7083010 | Apparatus and method for drilling and reaming a borehole A drilling assembly, a reamer, and an adjustable diameter stabilizer are disclosed. The reamer includes cutter elements mounted on at least a first fixed blade for reaming a previously-formed borehole or for forming a borehole of increased diameter beneath an existi... | 08/01/2006 |
| 7063146 | System and method for processing signals in a well A system and method for transferring data across a component in a well, according to which a first module receives the data and transmits the data, via electromagnetic waves, through the component, and a second module receives the transmitted data from the first mod... | 06/20/2006 |
| 7044218 | Apparatus for radially expanding tubular members An apparatus for radially expanding tubular members. ... | 05/16/2006 |
| 7040422 | Drill string member A drill string member is formed by providing a former and a cylindrical member to be shaped in relationship with the former. Seals are provided between opposing ends of a thick wall cylinder and the cylindrical member, a pressure is applied in the annulus between th... | 05/09/2006 |
| 7028788 | Wear sleeve Wear sleeve for a drill pipe coupling (10), where a sleeve (18) is arranged in a drill pipe coupling on one of the two adjoining, coupled together drill pipes (12, 14) in a drill string, where the sleeve has an outer diameter that is larger than... | 04/18/2006 |
| 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 |
| 6929076 | Bore hole underreamer having extendible cutting arms A bore hole underreamer is provided having a hollow body with a longitudinal axis, which has an external wall, at least two cylindrical bores provided through the external wall and whose axes are transverse to the longitudinal axis. Each of the bores have a cylindri... | 08/16/2005 |
| 6926099 | Drill out bi-center bit and method for using same A drill out bi-center bit and a method for using the same are provided that offer the ability to drill out cement and casing shoes, and increased stability. The bi-center bit includes a bit body having a first end operable to be coupled with a drill string, a second... | 08/09/2005 |
| 6924745 | System and method for monitoring packer slippage A system and method for monitoring a device in a well, according to which a sensor associated with the device monitors any movement of the device in the well and outputs a corresponding signal. The signal is processed and transmitted to a remote location. ... | 08/02/2005 |
| 6910534 | Apparatus for attaching a sensor to a tubing string A method and apparatus, for deploying a sensor attached to tubing in a highly deviated or horizontal wellbore, that are characterized by a stationary attachment system that securely fixes a sensor to a tubing string such that the sensor is coupled to the casing rega... | 06/28/2005 |
| 6907944 | Apparatus and method for minimizing wear and wear related measurement error in a logging-while-drilling tool A tool is presented for making density measurements of a formation surrounding a wellbore, comprising a collar housing in a drill string. The housing has at least one first section with a first outer diameter, and at least one sensing section with a second outer dia... | 06/21/2005 |
| 6845816 | ADI centralizer A centralizer for use in centralizing casing or other tubulars such as tubulars in an oil or gas well comprising an annular body with a bore extending through the body and one or more blades, the centralizer being adapted to fit around a tubular to be centralized, a... | 01/25/2005 |
| 6840337 | Method and apparatus for removing cuttings An apparatus and method for removing cuttings in a deviated borehole using drilling fluids. The apparatus includes a pipe string and a bottom hole assembly having a down hole motor and bit for drilling the borehole. The pipe string has one end attached to the bottom... | 01/11/2005 |
| 6732821 | Profiled element for rotary drilling equipment and applications to components of a string of drill pipes A profiled element for rotary drilling equipment and applications to components of a string of drill pipes has an area of abutment on the wall of a drilling hole having a maximum diameter constituting the maximum diameter of the rotary drilling equipment and a turbu... | 05/11/2004 |
| 6702046 | Drill device for a drilling apparatus The drill device has a body with a front end and a rear end and which is connectable to the shaft of a drilling apparatus. A plurality of angularly spaced apart slots are formed in the exterior of the device which extend between the front and rear ends. E... | 03/09/2004 |
| 6681875 | Guide tube of a drill string configured to facilitate unscrewing thereof from a member of the drill string A guide tube for use in a rock drill string includes a main portion, a sleeve disposed at a first end of the main portion, and a male thread portion disposed at a second end of the main portion. The sleeve forms a recess having a female thread. A flush ch... | 01/27/2004 |
| 6666285 | Logging-while-drilling apparatus and methods for measuring density Logging-while-drilling gamma ray back scatter density system with elements configured to minimize material between sensor and the borehole environs, maximize shielding and collimation efficiency, and increase operational reliability and ruggedness. The sy... | 12/23/2003 |
| 6585052 | Casing centralizer A tubing centralizer for borehole drilling disclosed. The centralizer includes a retaining collar and an outer sleeve. In a method for installing the centralizer onto a joint of tubing, the retaining collar is mounted onto the joint of tubing and the oute... | 07/01/2003 |
| 6516900 | Apparatus for directional drilling Grip and guiding device for directional drilling, in order to drill straight or curved holes with a predetermined path. The device includes a drill string (11-21) comprising parts which rotate during drilling, including a drill bit (11) or a water hammer ... | 02/11/2003 |
| 6516877 | Sucker rod protector An apparatus for reducing abrasive wear within a housing that includes a body having at least one protrusion selectively positioned and extending outwardly from the outer surface thereof, the body being placed concentrically within the housing and rubbing... | 02/11/2003 |
| 6484820 | Method and device for driving bore-holes, especially in the sea bed, using a guide tip A process and an apparatus for sinking drill holes, in particular exploration and extraction drill holes, with a drill pipe, which at its end facing the floor to be mined is provided with a guide point fixed in the longitudinal direction of the drill pipe... | 11/26/2002 |
| 6328119 | Adjustable gauge downhole drilling assembly A downhole drilling assembly including a housing having an upper end for connection to a drill string and a lower end, a fluid passage extending through the housing from the upper end to the lower end, a power unit contained within the housing, a drive as... | 12/11/2001 |
