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| Number | Title | Issue Date |
| 7467658 | Down hole drilling fluid heating apparatus and method An apparatus for providing heat energy to a fluid, including a housing adapted for connection into a working string and for inserting into a borehole, a flow path for the fluid extending within the housing, a pressure drop device positioned within the flow path, and... | 12/23/2008 |
| 7413034 | Steering tool A steering tool for use in drilling a borehole, including a tubular housing, a tool actuating device movably supported within the housing, a plurality of hydraulically actuated steering devices circumferentially spaced about the housing, and a hydraulic control syst... | 08/19/2008 |
| 7321293 | Integrated magnetic ranging tool An improvement in a tool of the type which is adapted for connection into a drilling string, which tool is adapted to perform a function in the drilling string as a first function. The improvement is a magnetic field source incorporated with the tool so that the too... | 01/22/2008 |
| 7320363 | Energized slip ring assembly A slip ring assembly including a slip ring and an electrical contact assembly. The slip ring defines a circumference and an electrical contact groove extending around the circumference of the slip ring. The electrical contact assembly preferably includes a plurality... | 01/22/2008 |
| 7306058 | Anti-rotation device for a steerable rotary drilling device In a drilling apparatus of the type comprising a rotatable drilling shaft and a housing for rotatably supporting a length of the drilling shaft for rotation therein, a rotation restraining device associated with the housing for restraining rotation of the housing. I... | 12/11/2007 |
| 7287603 | Combined casing expansion/casing while drilling method and apparatus A drilling assembly (2) comprises upper (4) and lower (6) drill strings with a fluid passage (80) therethrough for distributing fluid to a bottom hole assembly (10). The upper drill string (4) has an upper end (11) co... | 10/30/2007 |
| 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 |
| 7188689 | Variable gauge drilling apparatus and method of assembly therefor A variable gauge drilling apparatus and a method for assembling a variable gauge drilling apparatus for insertion in a subject borehole. The variable gauge drilling apparatus includes: an apparatus housing having a housing size which is suitable for insertion in a s... | 03/13/2007 |
| 7084782 | Drill string telemetry system and method A telemetry system and method for communicating information axially along a drill string comprised of a drive train supported within a housing. The system includes an axial conducting loop formed by the drill string for conducting an axial electrical signal embodyin... | 08/01/2006 |
| 6948572 | Command method for a steerable rotary drilling device In a drilling system of the type comprising a rotatable drilling string, a drilling string communication system and a drilling direction control device connected with the drilling string, a method is provided for issuing one or more commands to the drilling directio... | 09/27/2005 |
| 6769499 | Drilling direction control device A drilling shaft deflection assembly for a drilling direction control device of the type comprising a rotatable drilling shaft and a housing for supporting a length of the drilling shaft for rotation therein. The deflection assembly is contained within the housing a... | 08/03/2004 |
| 6712366 | Seal assembly for limiting the movement of a seal within a seal housing An improvement in a seal assembly of the type including a seal element retained by a seal housing, where one of the seal element and the seal housing is constructed from a compressible material, where the seal element includes a seal engagement surface and where the... | 03/30/2004 |
| 6640909 | Steerable rotary drilling device A fulcrum bearing assembly for rotatably supporting a shaft within a housing, including at least one row of spherical thrust bearings positioned at a first axial position within the housing, at least one row of spherical thrust bearings positioned at a se... | 11/04/2003 |
| 6244361 | Steerable rotary drilling device and directional drilling method A drilling direction control device, improvements in drilling direction control devices, methods for orienting a rotary driling system, and methods for rotary drilling. The drilling direction control device includes a rotatable drilling shaft, a housing f... | 06/12/2001 |
