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| Number | Title | Issue Date |
| 7669671 | Segmented sleeve on a downhole tool string component In one aspect of the invention a downhole tool string component has a segmented sleeve slideably attached over the exterior of a mandrel which is adapted for connection to an adjacent tool string component. An end of the sleeve is abutted against a shoulder element ... | 03/02/2010 |
| 7661488 | Regulator of angle and reactive moment of a gerotor type motor having a spindle and drilling bit in a bent drilling string A device for drilling controlled directional wells comprises a central hollow element and three hollow tubular elements connected thereto out-of-line with respect to each other. The first hollow tubular element connected by a thread to the spindle and the central ho... | 02/16/2010 |
| 7445059 | Drill string deflecting apparatus Manipulation of the rate of drilling fluid flow down a drill string containing the apparatus causes a drilling fluid powered linear motor, preferably a piston, to move an output shaft, hingedly attached to the general body to laterally, and selectively, deflect the ... | 11/04/2008 |
| 7360609 | Directional drilling apparatus A general housing encloses a drilling motor that can be disabled to permit optimum rotary drilling practice. A mode selector responds to manipulation of the drilling fluid flow rate and permits activation of the drilling motor to drive a drill bit. The general housi... | 04/22/2008 |
| 7347283 | Using a rotating inner member to drive a tool in a hollow outer member A rotating inner member is used to drive a downhole tool housed within the hollow outer member of a dual-member drill string. The downhole tool preferably will be adapted to receive rotational energy from the inner member. In a preferred embodiment, the downhole too... | 03/25/2008 |
| 7311157 | Tool for controlling rotation of a bottom hole assembly with respect to a drillstring A tool for controlling rotation of a bottom hole assembly with respect to a drillstring has a mandrell with a longitudinal groove and a circumferential groove extending therearound and in communication with the longitudinal groove, a locking element extending around... | 12/25/2007 |
| 7299886 | Stabilized down hole drilling motor A down hole drilling motor includes a stator housing having an exterior surface, an upper end, a lower end, an upper vane mounting region at the upper end and lower vane mounting region at the lower end. An upper mounting sleeve engages the upper vane mounting regio... | 11/27/2007 |
| 7287607 | Directional drilling apparatus A drilling motor is housed in the upper portion of a housing, with a drive shaft extending through a lower portion of the housing. The two portions are coupled by bearing that has an axis of rotation that is tilted a small amount relative to the axes of both portion... | 10/30/2007 |
| 7284605 | Apparatus and methods for reducing stand-off effects of a downhole tool A method for reducing stand-off effects of a downhole tool includes disposing the downhole tool in a borehole, wherein the downhole tool comprises at least one moveable section disposed between an energy source and a receiver on the downhole tool; and activating the... | 10/23/2007 |
| 7252150 | Downhole tool A downhole tool including a selectively releasable joint, a downhole drilling assembly including the downhole tool, and a corresponding method. In one embodiment of the invention, a downhole drilling assembly includes a downhole tool having a first body and a second... | 08/07/2007 |
| 7239098 | Digital adaptive sensorless commutational drive controller for a brushless DC motor Various embodiments of an electrical motor, a brushless DC motor controller, and applications thereof. In one embodiment, a fluid-moving device is provided with a brushless DC motor and a motor controller. The controller may include a set of comparators and a clocke... | 07/03/2007 |
| 7237624 | Electronic roll indexing compensation in a drilling system and method An assembly is configured for sensing its roll orientation, referenced to a roll indexing orientation that is defined by the assembly, so as to produce a roll output signal and for transmitting the roll output signal in a predetermined way. A housing is configured t... | 07/03/2007 |
| 7234544 | Drill tool shaft-to-housing locking device In a tool having an inner member supported within an outer member, wherein the tool defines a longitudinal axis, a device is provided for preventing relative rotation of the inner member and the outer member. The device is comprised of a locking mechanism and a lock... | 06/26/2007 |
| 7219727 | Wear resistant tubular connection A wear resistant casing connection including a wear resistant portion on its exterior surface is taught. A casing connection having a controlled bend angle is also taught. ... | 05/22/2007 |
| 7216726 | Downhole fluid-tight flexible joint A downhole tool comprises a joint, and a resilient member 65 which extends through the joint and provides a restoring force which tends to strengthen the joint. The joint may comprise a flex coupling 61 which allows limited articulation of the joint. F... | 05/15/2007 |
| 7204327 | Reverse circulation directional and horizontal drilling using concentric drill string Method and apparatus for drilling a directional or horizontal wellbore in a hydrocarbon formation using concentric drill string having an inner pipe and an outer pipe defining an annulus there between. A bottomhole assembly comprising a directional drilling means su... | 04/17/2007 |
| 7195083 | Three dimensional steering system and method for steering bit to drill borehole A steering assembly includes upper and lower tubular housings connected by a universal joint. An angle cam is disposed on the end of the lower housing and projects into the upper housing. A plurality of wedge members extend axially from the upper housing and into en... | 03/27/2007 |
| 7191828 | Hydraulically set concentric packer with multiple umbilical bypass through the piston A hydraulically set concentric packer with multiple umbilical bypass through the piston. In a described embodiment, a packer for use in a subterranean well includes a piston which displaces to set the packer in the well, and a line extending through the piston. The ... | 03/20/2007 |
| 7188685 | Hybrid rotary steerable system A bottom hole assembly is rotatably adapted for drilling directional boreholes into an earthen formation. It has an upper stabilizer mounted to a collar, and a rotary steerable system. The rotary steerable system has an upper section connected to the collar, a steer... | 03/13/2007 |
| 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 |
| 7165609 | Apparatus for handling tubular goods An apparatus for handling tubular goods which includes an elongate tubular body having a peripheral sidewall and opposed ends. The peripheral sidewall has a plurality of axial slots arranged circumferentially around the tubular body parallel to an axis of the tubula... | 01/23/2007 |
| 7159668 | Centralizer A centralizer 10 for mounting on a tubular member such as a section of casing, together with one or more stops 42, 48 for retaining the centralizer thereon. The stops 42, 48 are provided with profiles for engaging the centralizer to restrict rot... | 01/09/2007 |
| 7147066 | Steerable drilling system and method A bottom hole assembly 10 for drilling a deviated borehole includes a positive displacement motor (PDM) 12 or a rotary steerable device (RSD) 110 having a substantially uniform diameter motor housing outer surface without stabilizers extending r... | 12/12/2006 |
| 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 |
| 7104345 | Downhole rotatable-shaft connector assembly and method A connector assembly for connecting with a rotatable shaft is provided. The connector assembly includes a mating sleeve threadably coupleable about the shaft and a center sleeve sized and shaped for deployment between the shaft and the mating sleeve. The center slee... | 09/12/2006 |
| 7062858 | Hand tool and knife for deburring A hand tool for deburring is provided, as well as a cutting blade to be inserted into the tool, the tool comprising a housing, and a rotatable holding device, the holding device being positioned in and being rotatable in the housing and having a chamber for releasab... | 06/20/2006 |
| 7048078 | Expandable underreamer/stabilizer A downhole tool that functions as an underreamer or as a stabilizer in an underreamed borehole. The tool includes one or more moveable arms disposed within a body having a flowbore therethrough in fluid communication with the wellbore annulus. The tool alternates be... | 05/23/2006 |
| 7028789 | Drilling assembly with a steering device for coiled-tubing operations The present invention provides a drilling assembly for drilling deviated wellbores. The drilling assembly includes a drill bit at the lower end of the drilling assembly. A drilling motor provides the rotary power to the drill bit. A bearing assembly of the drilling ... | 04/18/2006 |
| 7025152 | Using a rotating inner member to drive a tool in a hollow outer member A rotating inner member is used to drive a downhole tool housed within the hollow outer member of a dual-member drill string. The downhole tool preferably will be adapted to receive rotational energy from the inner member. In a preferred embodiment, the downhole too... | 04/11/2006 |
| 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 |
| 7017650 | Earth loop energy systems Wellbore heat loop systems, fillers for bores in the systems, and methods of the use of such systems; the systems in certain aspects having a heat loop wellbore in the earth having heat loop pipe extending down to one side of a bottom member and up therefrom on anot... | 03/28/2006 |
| 7013994 | Directional drilling apparatus Directional drilling apparatus for use in drilling a deviated bore comprises a mandrel for mounting to a drill string and having a main axis. A non-rotating mass is rotatably mounted on the mandrel and has a center-of-gravity spaced from the mandrel axis. The appara... | 03/21/2006 |
| 7004263 | Directional casing drilling A directional casing drilling system including a casing string for rotation of a drill bit, a shaft coupled to the casing string, and a sleeve having pads that are hydraulically extensible. The sleeve may be positioned about a portion of the shaft. The invention may... | 02/28/2006 |
| 6962214 | Rotary seal for directional drilling tools A rotary valve assembly for a rotary steerable tool is disclosed for directing flow of an abrasive laden drilling fluid; the valve assembly has a first sealing surface rotatably engaging a second sealing surface. At least one of the surfaces has at least about 5% of... | 11/08/2005 |
| 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 |
| 6949025 | Downhole motor universal joint assembly A downhole motor universal joint assembly includes a female coupler which receives a male end of a drive shaft. The female coupler has a retainer that prevents separation of the male end and the female coupler. The retainer has a rearward extending skirt with flow p... | 09/27/2005 |
| 6942044 | Three-dimensional steering tool for controlled downhole extended-reach directional drilling A steering tool for extended-reach directional drilling in three dimensions comprises a mud pulse telemetry section, a rotary section, and a flex section assembled as an integrated system in series along the length of the tool. The flex section comprises a flexible ... | 09/13/2005 |
| 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 |
| 6935442 | Stabilizer device for rotary string of drill rods with reduced friction The stabilizer (1) has a tubular central body (3) having means for connection (3a, 3b) to a first and a second component of the string of drill rods and at least one external contact element (4) with a wall (2 | 08/30/2005 |
| 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 |