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| Number | Title | Issue Date |
| 7389833 | Multi-sectional percussive drill bit assembly A multi-sectional percussive drill bit assembly for drilling holes in earth formation primarily used in conjunction with a pneumatic percussive device. The drill bit assembly is comprised of an easily removable bit that is rotationally driven by a lug and pocket str... | 06/24/2008 |
| 7341116 | Drilling efficiency through beneficial management of rock stress levels via controlled oscillations of subterranean cutting elements A device and system for improving efficiency of subterranean cutting elements uses a controlled oscillation super imposed on steady drill bit rotation to maintain a selected rock fracture level. In one aspect, a selected oscillation is applied to the cutting element... | 03/11/2008 |
| 7337858 | Drill bit assembly adapted to provide power downhole In one aspect of the invention, a drill bit assembly has a body portion intermediate a shank portion and a working portion, the working portion having at least one cutting element. The working portion also has an opening to an axial chamber disposed in the body port... | 03/04/2008 |
| 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 |
| 7168495 | Casing-engaging well tree isolation tool and method of use A casing-engaging wellhead isolation and method of the tool protects wellheads from lifting pressures induced by high fluid pressures and high flow rates used to stimulate low pressure wells. A releasable packer assembly mounted to a bottom end of a mandrel of the t... | 01/30/2007 |
| 7140814 | Spade-type drill bit having helical configuration A spade bit including a longitudinally extending shaft having a cutting member located at a distal end thereof. The cutting member comprises a pair of helically shaped, opposed blades joined along the longitudinal axis of the shaft and an axially extending pilot spu... | 11/28/2006 |
| 7117959 | Systems and methods for remotely determining and changing cutting modes during decoking A decoking system that not only enables an operator to remotely switch the coke-cutting process from boring to cutting mode without removing the drill stem from the coke drum, but also to remotely determine the drill stem's mode so that efficiency, safety and conven... | 10/10/2006 |
| 7055632 | Well stimulation tool and method for inserting a backpressure plug through a mandrel of the tool A well stimulation tool includes a well stimulation tool mandrel with an axial bore having an internal diameter large enough to permit a backpressure plug to be run through the mandrel into a tubing mandrel, such as a tubing hanger or a casing mandrel, to which the ... | 06/06/2006 |
| 6607046 | Expandable drill bit A drill bit suitable to be connected to a drill string for drilling a borehole into an earth formation, the drill string having a central longitudinal axis, the drill bit comprising a bit body connectable to the lower end of the drill string, and a cuttin... | 08/19/2003 |
| 6142250 | Rotary drill bit having moveable formation-engaging members Formation engaging elements are moveably mounted onto a drill bit. Such elements may be used to protect other rigidly mounted formation engaging elements from impacts that occur during use of the drill bit, or they may be used to alter the aggressiveness ... | 11/07/2000 |
| 5027914 | Pilot casing mill A pilot casing mill for removing unwanted pipe from a well bore, which includes a cylindrical pilot having helical vanes and adapted for mounting on one end of a cylindrical mill body. The mill body is provided with longitudinal slots which receive outwar... | 07/02/1991 |
| 5004056 | Percussion-rotary drilling tool The proposed tool comprises a body (1) designed to interact with a percussion-rotary device and a casing (2) shaped as a sleeve. The casing (2) accommodates rock-crushing elements (5, 6) arranged in a manner allowing axial displacement thereof and in the ... | 04/02/1991 |
| 4974688 | Steerable earth boring device A steerable earth boring device comprises a compaction auger rotatably mounted to a housing at one end of the auger such that the compaction auger is substantially externally exposed. A steering tip is pivotably disposed at the other end of the compaction... | 12/04/1990 |
| 4923021 | Combination bit for coking oven A combination bit for both drilling a pilot hole and cutting coke from a coking drum. A manually operable flow divider/diverter valve permits a single workman to quickly and easily change from pilot hold drilling mode to cutting mode without having to cha... | 05/08/1990 |
| 4842337 | Mining bit and holder A cutting apparatus includes a fixed holder and an orientable holder. The fixed holder is mounted to a cutting drum, and the orientable holder receives a cutting bit which may either be a forward attack bit or a conical bit. Orientation of the bit is acco... | 06/27/1989 |
| 4690228 | Changeover bit for extended life, varied formations and steady wear A roller cone bit may be used as a rotating drag bit by treating the roller cones as carriers for a plurality of distinguishable types of drag cutters. The roller cones are each coupled to a mechanism which selectively allows rotation of the roller cones.... | 09/01/1987 |
| 4610318 | Rotary cutter assembly A rotary cutter assembly comprises a drill head having a plurality of receptacles which releasably receive rolling cutter bit assemblies. The bit assemblies are locked in position by a locking sleeve connecting transverse fluid passageways of the drill he... | 09/09/1986 |
| 4456075 | Weeding auger with U-shaped blade An elongated upstanding shank is provided including a ground piercing lower end and an upper end including structure for applying rotary torque to the shank. The lower end portion of the shank supports a generally horizontally disposed U-shaped blade ther... | 06/26/1984 |
| 4278296 | Coal mining drum with adjustable linier edge cutters A coal winning machine with a mechanical tool has a tool body provided with one or more projecting flanges helically surrounding the axis of rotation of the tool body. Cutting tools are provided, each having a linear cutting edge, and these are removably ... | 07/14/1981 |
