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| Number | Title | Issue Date |
| 7370711 | Rolling cone drill bit having non-circumferentially arranged cutter elements A rolling cone drill bit including multiple cones with regions of intermeshing and non-intermeshing cutter elements. In the non-intermeshed regions, an array of cutter elements is disposed about the cone surface in a non-circumferential arrangement with the cutter e... | 05/13/2008 |
| 7360612 | Roller cone drill bits with optimized bearing structures A roller cone drill bit may include optimally designed bearing structures and cutting structures. The roller cone drill bit may include three cone assemblies rotatably mounted on respective spindles via respective bearing structures. Each cone assembly may have a re... | 04/22/2008 |
| 7334652 | Roller cone drill bits with enhanced cutting elements and cutting structures Roller cone drill bits are provided with cutting elements and cutting structures optimized for efficient drilling of soft and medium formations interspersed with hard stringers. The cutting elements and cutting structures may be satisfactorily used to drill downhole... | 02/26/2008 |
| 7284623 | Method of drilling a bore hole A method for drilling a borehole through a production zone underlying an overburden of various earth formations includes drilling the borehole through the overburden with a first drill bit. The first drill bit being selected to optimize at least one drilling perform... | 10/23/2007 |
| 7059431 | Self-penetrating drilling method and thrust-generating tool for implementing same The invention concerns a self-penetrating drilling method and a thrust-generating tool: the tool comprises N blades. Each blade comprised K drill cutters. The shapes, positions and orientations of said drill cutters are determined in the following manner: the k... | 06/13/2006 |
| 7013999 | Wedge tooth cutter element for drill bit A cutter element for a rolling cone bit includes a cutting surface having front and back surfaces, a pair of flanking surfaces that intersect in a rounded nose that is offset from the central axis of the cutter element's base. At least one flanking surface includes ... | 03/21/2006 |
| 6997273 | Blunt faced cutter element and enhanced drill bit and cutting structure The cutter element includes a rounded apex offset from the center line of the insert and having a relatively broad and blunt front face and a narrower, more rounded rear face. The cutter element may be disposed in the outermost inner row of a rolling cone cutter of ... | 02/14/2006 |
| 6595304 | Roller bit parallel inlayed compacts This invention relates to a roller bit applying for the oil, natural gas, mine and geological drilling, and more particularly relates to a kind of roller bit with the parallel inlayed compacts, it includes head and cone, the compact land and the teeth-gro... | 07/22/2003 |
| 6394198 | Frictional vibration damper for downhole tools A damper for downhole tools consisting of a plurality of damping inserts arrayed about the tool body so that their radial protrusion describes a circumference greater than desired gauge of the borehole. The damper inserts are configured with rounded worki... | 05/28/2002 |
| 6167917 | Drill pipe A drill pipe having a length of conduit having a first diameter, a first and a second end portion, where each end portion has a second diameter greater than the first diameter. An enlarged portion is located between and spaced from the first and second en... | 01/02/2001 |
| 5547033 | Rotary cone drill bit and method for enhanced lifting of fluids and cuttings A rotary cone drill bit for forming a borehole having a bit body with an upper end portion adapted for connection to a drill string. A number of support arms extend from the bit body. Each support arm has an exterior surface. A number of cutter cone assem... | 08/20/1996 |
| 5456328 | Drill bit with improved rolling cutter tooth pattern A drill bit includes a rolling cutter having a plurality of closed-end circumferential rows of teeth protruding from the body of the cutter. At least one of the rows of teeth lies along a path defined either by multiple helical segments or a canted planar... | 10/10/1995 |
| 5429201 | Drill bit with improved rolling cutter tooth pattern A drill bit includes a rolling cutter having a plurality of circumferential rows of teeth protruding from the body of the cutter. At least one of the rows of teeth is a closed-end circumferential row located on the surface of the cutter along a closed-end... | 07/04/1995 |
| 5224560 | Modular drill bit A modular drill bit mounts legs within recesses in a body which are parallel to the central axis of the body using threaded studs with tapered outer portions, in conjunction with an attached pin having recesses therein receiving the upper ends of the legs... | 07/06/1993 |
| 4848491 | Rotary drill bits A drill bit for drilling deep holes in subsurface formations comprises a bit body having a generally hemispherical leading face and a gauge region, and two blades each extending spirally outwardly across the leading face of the bit body away from the axis... | 07/18/1989 |
| 4717290 | Milling tool This miling tool for underground work consists of a tool body which has a plurality of cutter blades. Each cutter blade has a negative axial rake and an essentially constant negative radial rake. In addition, each cutter arm has a close packing of cylindr... | 01/05/1988 |
| 4552232 | Drill-bit with full offset cutter bodies A rotary drag drill bit is seen wherein cutter bodies are rotatively connected to a main body structure at a fully offset position. The fully offset position is defined by a rotational axis of each cutter body, a longitudinal axis of the drill bit and end... | 11/12/1985 |
| 4408671 | Roller cone drill bit A roller bit for use with a drill string, having at least two cutters which are generally conically shaped; each cutter includes one or more teeth in inclined planes across a conical surface. The bit is attached to the drill string with the axis of rotati... | 10/11/1983 |
| 4393949 | Rock boring apparatus Apparatus for boring holes in rock comprising a boring head rotatable about an axis of advance and a multiplicity of cutters mounted on the head, a plurality of which each comprises a cutter body rotatable about a cutter axis and cutting tooth means formi... | 07/19/1983 |
| 4320808 | Rotary drill bit A rotary drill bit and drill bit cone for drilling bore holes through earth formations. The rotary drill bit includes a generally hollow body portion having a plurality of longitudinally extending shanks which terminate with inwardly directed spindles. A ... | 03/23/1982 |
| 4304440 | Roller cutter A roller cutter especially adapted to fracture permafrost material includes a plurality of cutter teeth integrally formed with, and extending radially outwardly from the outer surface of a rotor. The rotor is antifrictionally supported on a stator to enab... | 12/08/1981 |
| 4194791 | Grooved earthworking bit and method of enhancing the life thereof The specification discloses an insert tipped tool bit having grooves formed on the longitudinal periphery of the bit in the parent material supporting the insert and a method of reducing erosion of the insert supporting parent material by forming grooves ... | 03/25/1980 |
