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| Number | Title | Issue Date |
| 7836975 | Morphable bit A bottom hole assembly for drilling a cavity including a chassis configured to rotate is provided. The chassis may include a conduit, a circuit, a pressure transfer device, a plurality of pistons, a plurality of valves, and a plurality of cutters. The conduit may ac... | 11/23/2010 |
| 7493971 | Concentric expandable reamer and method An expandable downhole tool comprises a tubular body, at least one moveable arm disposed within the tubular body and being radially translatable between a retracted position and a wellbore engaging position, and at least one piston operable to mechanically support t... | 02/24/2009 |
| 7383900 | Drill bit and system for drilling a borehole A drill bit for drilling a borehole in an object, the drill bit having a central longitudinal axis and comprising a bit body provided with a central shank for connecting the drill bit to a drilling system. The drill bit further comprises at least one cutting arm, ea... | 06/10/2008 |
| 7370712 | Under reamer An under reamer for expanding a borehole through an earthen formation is taught. The under reamer includes: a mandrel including an end for connection into a drill string and an opposite end and a housing including an inner bore, telescopically disposed over the mand... | 05/13/2008 |
| 7360952 | Bicycle hub A bicycle hub is provided that comprises a hub axle, a hub body, a bearing and a clearance adjusting member. The bearing includes an outer ring coupled to the hub body, an inner ring coupled to the hub axle, and a plurality of rolling components disposed between the... | 04/22/2008 |
| 7350596 | Methods and apparatus for expanding the diameter of a borehole A borehole reamer which may be deployed to a desired depth in an existing uncased borehole or below existing casing and used to substantially expand the diameter of the borehole. The diameter may be expanded by an amount that ranges from a fraction to a multiple of ... | 04/01/2008 |
| 7314099 | Selectively actuatable expandable underreamer/stablizer An expandable downhole tool comprises a tubular body having an axial flowbore extending therethrough, at least one moveable arm, and a selectively actuatable sleeve that prevents or allows the at least one moveable arm to translate between a collapsed position and a... | 01/01/2008 |
| 7306056 | Directional cased hole side track method applying rotary closed loop system and casing mill A bottomhole assembly (BHA) for single trip sidetracking operations has a mill for forming an open hole section in a cased wellbore and a steering unit for controlling drill bit orientation. During use, the drilling system is assembled at the surface and tripped int... | 12/11/2007 |
| 7195080 | Expandable drilling tool and method A system is provided (1) for increasing the diameter of at least a portion of a well bore, the system being intended to be attached to a drill pipe (3), the system having a support element (10) bearing cutting arms (13, 14) which is movab... | 03/27/2007 |
| 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 |
| 7152702 | Modular system for a back reamer and method A modular back reamer to be used in subterranean drilling includes a drive stem, a reamer body having a plurality of receptacles, wherein the receptacles are configured to retain a cutting leg assembly, and a plurality of shims engaged within the receptacles to secu... | 12/26/2006 |
| 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 |
| 6902014 | Roller cone bi-center bit A roller cone bi-center bit for economically drilling an enlarged borehole below casing in earth formation is provided. The bi-center bit includes a rolling cone cutter or other appropriate cutter to enlarge a pilot bore also made by rolling cone or other type of cu... | 06/07/2005 |
| 6892815 | Coal bed methane borehole pipe liner perforation system A coalbed methane borehole pipe liner perforation system comprises a plastic pipe punch that slips down inside a coalbed methane production borehole lined with a non-perforated plastic pipe. A ground-penetrating radar is used inside the plastic-pipe lined borehole t... | 05/17/2005 |
| 6668949 | Underreamer and method of use An underreamer (5) is formed from a tubular body (10) having a longitudinal bore therethrough, and providing an integral piston actuator (20) responsive to hydraulic pressure to move cutters (40) into engagement with the well bore and springs (60) to resi... | 12/30/2003 |
| 6427788 | Underreaming rotary drill A drilling apparatus for underreaming includes a top sub, a pressure sleeve mated to the top sub, and a blade body mated to the pressure sleeve. A pilot bit is mated to the lower end of the blade body. A plurality of movable cutting blades are pivotably a... | 08/06/2002 |
| 5971085 | Downhole unit for use in boreholes in a subsurface formation A downhole unit for use in subsurface boreholes, for example a bias unit for imparting a lateral bias to the drill bit to control the direction of drilling, includes a main body and a number of pads pivotally mounted on the main body for engagement with t... | 10/26/1999 |
| 5957224 | Double bit assembly and method of using the same A method to drill a hole in the soil by a bit assembly and a bit assembly comprising a ring-shaped bit (2) to drill the outer circle of the hole and to which a protection tube system (4), mounted in the hole while drilling, is coupled, and a cylindric inn... | 09/28/1999 |
| 5074355 | Section mill with multiple cutting blades A section mill for cutting through well casing, the mill including multiple sets of cutting blades which are selectively engaged to continue cutting operations as blades dull. The cutting blade sets are selectively indexable such that as a first set dulls... | 12/24/1991 |
| 5036921 | Underreamer with sequentially expandable cutter blades An underreamer tool has a body with upper and lower portions having an upper cutter blade slot extending transversely through the upper portion and a lower cutter blade slot extending transversely through the lower portion at a right angle thereto. The up... | 08/06/1991 |
| 4809793 | Enhanced diameter clean-out tool and method A downhole cutting tool, specifically adapted to function as an enhanced diameter clean-out tool, includes longitudinal bores which are opened to fluid flow when cutting members are moved to their extended positions. Upper and lower subassemblies are conn... | 03/07/1989 |
| 4153121 | Fluid operated undercutter The invention herein relates to an undercutting device which is provided with a substantially tubular body adapted to be placed within a parallel-sided hole. A rotary percussion head is provided at one end of the body and has one or more cutting tools whi... | 05/08/1979 |
