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| Number | Title | Issue Date |
| 7363691 | Method and apparatus for forming a mono-diameter wellbore casing A mono-diameter wellbore casing. The mono-diameter wellbore casing is formed by plastically deforming and radially expanding a first tubular member within a wellbore. A second tubular member is then plastically deformed and radially expanded in overlapping relation ... | 04/29/2008 |
| 7343983 | Method and apparatus for isolating and testing zones during reverse circulation drilling A zone isolating and testing apparatus comprising an isolation tool and a downhole flow control means and a method of using such apparatus. The zone isolating and testing apparatus is particularly useful for testing zones during reverse circulation drilling using co... | 03/18/2008 |
| 7287608 | Method and device for drilling a hole in soil or rock material and for forming an anchoring A method and device for boring a hole in soil or rock material and for forming an anchoring are disclosed. A borehole is formed by inserting a drill bit, and tensioning elements coupled to the drill bit are introduced into the borehole. After completion, the boring ... | 10/30/2007 |
| 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 |
| 7275593 | 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 ... | 10/02/2007 |
| 7255172 | Hydrodynamic, down-hole anchor A method of removably anchoring well tubing in a well bore may include selecting a well having a bore diameter and an anchor positioned therein. The anchor may have a housing defining an anchor diameter and extension members extending therefrom toward the bore diame... | 08/14/2007 |
| 7216700 | Torsional resistant slip mechanism and method A well bore tool with a torsional resistant slip mechanism for resisting axial and torsional forces comprising a mandrel, a plurality of slips disposed about the circumference of the mandrel. The slips include a plurality of inserts oriented to resist axial forces a... | 05/15/2007 |
| 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 |
| 7195079 | Directional reaming system A horizontal directional drilling system is used to drive operation of a guidable reamer assembly connected to a drill string. The guidable reamer assembly preferably has a cutting member with a central longitudinal axis and a support member also having a central lo... | 03/27/2007 |
| 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 |
| 7188687 | Downhole filter A downhole filter comprises a tubular member having a wall defining a plurality of openings. The openings have an outer width less than an inner width. The parts of the opening defining the smaller width are defined by radially outer parts of the openings, such that... | 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 |
| 7156181 | Puller-thruster downhole tool A method and apparatus for propelling a tool having a body within a passage. The tool includes a gripper including at least a gripper portion which can assume a first position that engages an inner surface of the passage and limits relative movement of the gripper p... | 01/02/2007 |
| 7134512 | Method of downhole drilling and apparatus therefor A downhole drilling apparatus suspended by tubing includes a drill bit driven by an electric motor powered by a cable means. The motor is mounted upon a hollow shaft which allows fluid to pass through, so that a fluid circuit along the tube and back along the annulu... | 11/14/2006 |
| 7121364 | Tractor with improved valve system A hydraulically powered tractor adapted for advancement through a borehole including an elongate body, aft and forward gripper assemblies, and a valve control assembly housed within the elongate body. The aft and forward gripper assemblies are adapted for selective ... | 10/17/2006 |
| 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 |
| 7086481 | Wellbore isolation apparatus, and method for tripping pipe during underbalanced drilling The present invention relates to an apparatus and method for isolating a wellbore condition such as formation pressure during a wellbore operation. The invention has particular application in connection with underbalanced drilling. In one arrangement, a formation is... | 08/08/2006 |
| 7066281 | Formation fluid sampling and hydraulic testing tool and packer assembly therefor A drilling apparatus that includes a formation fluid sampling and hydraulic testing tool for a drilling apparatus that includes a drilling string comprised of a drilling pipe and a drilling bit is provided. The tool is mounted on a string that comprises from top to ... | 06/27/2006 |
| 7048047 | Gripper assembly for downhole tools A gripper assembly for anchoring a tractor within a downhole passage and for assisting movement of the tractor 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 pas... | 05/23/2006 |
| 6981560 | Method and apparatus for treating a productive zone while drilling A method and apparatus for delivering a well treatment fluid to a productive zone of a subterranean formation at the same time that a well bore is being drilled is provided. The method includes the steps of delivering a drill-in fluid to a drill bit drilling a well ... | 01/03/2006 |
| 6973978 | Drilling tool having an expandable bladder and method for using same A drilling tool having an expandable bladder and a method for using the same are provided. The drilling tool includes a tool body having an interior cavity, a plurality of extendable arms coupled with the tool body, and an expandable bladder at least partially dispo... | 12/13/2005 |
| 6955232 | Equipment for drilling vertical boreholes The invention relates to equipment for drilling a vertical borehole in hard ground, the equipment comprising: casing put successively into place in the borehole; a drilling machine having a rotary cutting head and ... | 10/18/2005 |
| 6761233 | Apparatus for propulsion in elongated cavities An apparatus for propulsion inside an oblong cavity, such as pipes or the like, is disclosed. The apparatus is characterized by comprising a central rotating part comprising an inclined wheel construction arranged to thrust towards the inner wall of the cavity, in t... | 07/13/2004 |
| 6715559 | Gripper assembly for downhole tractors A gripper assembly for anchoring a tractor within a downhole passage and for assisting movement of the tractor 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 pas... | 04/06/2004 |
| 6640894 | Gripper assembly for downhole tools A gripper assembly for anchoring a tractor within a downhole passage and for assisting movement of the tractor within the passage. The gripper assembly includes an elongated mandrel and flexible toes that can be radially displaced to grip onto the surface... | 11/04/2003 |
| 6588542 | Borehole tool actuating mechanism A borehole tool including a tool body having and an anchoring mechanism, the anchoring mechanism having a drive mechanism including a motor, drive shaft, and clutch; an anchor arm moveable between first and second positions relative to the tool body; a pu... | 07/08/2003 |
| 6578638 | Drillable inflatable packer & methods of use Methods for reclaiming a borehole extending from an earth surface into the earth, part of which borehole is in a lost circulation zone. The methods include the steps of closing off the borehole to fluid flow above the lost circulation zone by installing a... | 06/17/2003 |
| 6561269 | Canister, sealing method and composition for sealing a borehole Canister, sealing method and composition for sealing a borehole. The canister includes a container with slurry inside the container, one or more slurry exits at one end of the container, a pump at the other end of the container, and a piston inside that p... | 05/13/2003 |
| 6530428 | Method and apparatus for in-situ production well testing An apparatus for in situ borehole testing having a drill string with drill pipe and drill bit. An upper sleeve and lower sleeve are telescopically coupled together. A valve seat is located in an interior passage and closes the interior passage when a valv... | 03/11/2003 |
| 6516898 | Continuous wellbore drilling system with stationary sensor measurements The present invention provides continuous or near continuous motion drill strings which include motion sensitive and other MWD sensors which take stationary measurements while the drilling assembly is continuing to drill the wellbore. For simultaneous con... | 02/11/2003 |
| 6464003 | Gripper assembly for downhole tractors A gripper assembly for anchoring a tractor within a downhole passage and for assisting movement of the tractor within the passage. The gripper assembly includes an elongated mandrel and flexible toes that can be radially displaced to grip onto the surface... | 10/15/2002 |
| 6431291 | Packerfoot with bladder assembly having reduced likelihood of bladder delamination A packerfoot includes a bladder assembly comprising an elongated generally tubular inflatable bladder having ends bonded to generally rigid bladder attachment portions. The bladder includes end portions bonded to the bladder attachment portions and a cent... | 08/13/2002 |
| 6343650 | Test, drill and pull system and method of testing and drilling a well A test, drill and pull system for testing a well formation or zone of interest and further drilling of the well in a single trip into the wellbore. The system includes a surface readout tester valve, a rotation-operated reversing valve, a resettable packe... | 02/05/2002 |
| 6315075 | Borehole logging tool with anchoring mechanism A borehole tool, such as a seismic shuttle-type logging tool, including a tool body having at least one sensor package and an anchoring mechanism, the anchoring mechanism having a drive mechanism including a motor, a drive shaft and a clutch; an anchoring... | 11/13/2001 |
| 6296056 | Subsurface measurement apparatus, system, and process for improved well drilling, control, and production Subsurface wellbore conditions are measured directly in the wellbore while the fluid circulation system is not pumping. The measured values are recorded at the subsurface location and subsequently transmitted to the well surface when circulation is resume... | 10/02/2001 |
| 6179055 | Conveying a tool along a non-vertical well A conveyance apparatus for conveying at least one logging tool through an earth formation traversed by a horizontal or highly deviated borehole. The conveyance apparatus comprises a pair of arcuate-shaped cams pivotally mounted to a support member, a spri... | 01/30/2001 |
| 6148912 | Subsurface measurement apparatus, system, and process for improved well drilling control and production Subsurface wellbore conditions are measured directly in the wellbore while the fluid circulation system is not pumping. The measured values are recorded at the subsurface location and subsequently transmitted to the well surface when circulation is resume... | 11/21/2000 |
| 6119774 | Caged slip system An improved cage slip system is disclosed. The cage is constructed so that the cones which actuate the slips extend into the cage openings. The radial extension of the slips is limited so as to retain them if they are extended in an unsupported situation.... | 09/19/2000 |
| 5954131 | Method and apparatus for conveying a logging tool through an earth formation A conveyance apparatus for conveying at least one logging tool through an earth formation traversed by a horizontal or highly deviated borehole is disclosed. The conveyance apparatus comprises a pair of arcuate-shaped cams pivotally mounted to a support m... | 09/21/1999 |
| 5827014 | Friction rock stabilizer This invention relates to a friction rock stabilizer which includes an elongated tendon tube which is reduced in cross-sectional dimension over a portion of its length towards one end of the tube, a slot which extends over at least the unreduced length of... | 10/27/1998 |
