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| Number | Title | Issue Date |
| 7377332 | Multiple inserts of different geometry in a single row of a bit A method for designing a roller cone drill bit having a plurality of cutting elements in a row. The method includes defining a pitch pattern for the plurality of cutting elements such that a first group of adjacent cutting elements are arranged in a first pitch and ... | 05/27/2008 |
| 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 |
| 7318492 | Rotary drill bit A drill bit for drilling a borehole with a steerable drilling system, the drill bit comprising a longitudinal axis, and a cutting profile with a leading face section blended with a curved region into a tapered gauge region having a tapered gauge profile. The tapered... | 01/15/2008 |
| 7234549 | Methods for evaluating cutting arrangements for drill bits and their application to roller cone drill bit designs A method for evaluating a cutting arrangement for a drill bit includes selecting a cutting element arrangement for the drill bit and calculating a score for the cutting arrangement. This method may be used to evaluate the cutting efficiency of various drill bit desi... | 06/26/2007 |
| 7195078 | Multiple inserts of different geometry in a single row of a bit A method for designing a roller cone drill bit having a plurality of cutting elements in a row. The method includes defining a pitch pattern for the plurality of cutting elements such that a first group of adjacent cutting elements are arranged in a first pitch and ... | 03/27/2007 |
| 7182407 | Rock boring device with an oscillating and nutating rotary disc cutter A rock boring device (10) including a rotary disc cutter (11). The disc cutter (11) is driven in an oscillating manner and also driven or free to nutate, and the device includes a mounting section (22) for the rotary disc cutter and a dri... | 02/27/2007 |
| 7096981 | Alternating inclinations of compacts for drill bit Compacts are oriented in certain places on roller cones of an earth boring bit to increase the number of compacts in certain rows. The compacts that are pressed into holes in rows on the cones. The compacts are of tungsten carbide and have a cutting end axis and a b... | 08/29/2006 |
| 7066288 | Asymmetric compact for drill bit Asymmetrical compacts are utilized in certain places on roller cones of an earth boring bit to increase the number of compacts in certain rows. The compacts that are pressed into holes in rows on the cones. The compacts are of tungsten carbide and have a cutting end... | 06/27/2006 |
| 7040424 | Drill bit and cutter having insert clusters and method of manufacture Disclosed is a rolling cone cutter and drill bit employing multiple inserts retained as a cluster in an aperture in the cone cutter. Apertures in which the insert clusters are retained are multilobed apertures formed by intersecting bores formed in the cone steel. T... | 05/09/2006 |
| 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 |
| 6986395 | Force-balanced roller-cone bits, systems, drilling methods, and design methods Roller cone drilling wherein the bit optimization process equalizes the downforce (axial force) for the cones (as nearly as possible, subject to other design constraints). ... | 01/17/2006 |
| 6942045 | Drilling with mixed tooth types A rotary-cutter Earth-penetrating bit in which a given track of bottom hole is attacked by inserts of two different types, e.g. chisel-shaped and pointed, wider and narrower, higher and shorter, and/or of different materials. The different types of inserts can both ... | 09/13/2005 |
| 6929079 | Drill bit cutter element having multiple cusps Cutter elements for use in rolling cones rock bits are disclosed having a crown that includes multiple, spaced-apart cusps for enhancing formation removal by creating overlapping Hertzian contact zones. The cusps may be partially dome-shaped, berm shaped or otherwis... | 08/16/2005 |
| 6834733 | Spiral wave bladed drag bit A drag-type drill bit for bore hole drilling in earth formation comprises a bit body having a threaded pin on one end for coupling to a drill string. A substantially dome-shaped cutter head is formed integral with the bit body opposite from the threaded pin. Formed ... | 12/28/2004 |
| 6827161 | Roller cone drill bit having non-axisymmetric cutting elements oriented to optimize drilling performance A method for optimizing drilling performance of a roller cone drill bit is disclosed. The method includes simulating drilling with the bit in a selected earth formation to determine at least one drilling performance parameter. The orientation of at least one non-axi... | 12/07/2004 |
| 6766870 | Mechanically shaped hardfacing cutting/wear structures A hardfacing material is applied to cutting elements formed on the surface of cutters of an earth-boring bit. The hardfacing material forms the outer surface of the teeth, and also substantially forms scrapers on the shell of each of the cutters. The adding of the h... | 07/27/2004 |
| 6725952 | Bowed crests for milled tooth bits A drill bit has a bit body and at least one roller cone rotatably mounted on the bit body. The cone has a plurality of milled teeth at selected locations on the cone. At least one of the milled teeth has a substrate having a convex crest and a layer of hardfacing ap... | 04/27/2004 |
| 6651758 | Rolling cone bit with elements fanned along the gage curve An earth-boring bit for drilling a borehole comprises a bit body having a bit axis, at least two rolling cone cutters rotatably mounted on the bit body, a plurality of inner row cutter elements positioned on at least one cone cutter in a first inner row, ... | 11/25/2003 |
| 6612384 | Cutting structure for roller cone drill bits New cutting structures for roller cone drill bits. In one aspect, a drill bit includes a bit body, roller cones attached to the bit body and able to rotate with respect to the bit body, and a plurality of cutting elements disposed on each of the roller co... | 09/02/2003 |
| 6601661 | Secondary cutting structure A three cone roller bit with rolling cone cutters that are provided with both primary and secondary cutting elements. The primary cutting elements extend outwardly from lands on the outer surface of the cutter body. The secondary cutting elements are disp... | 08/05/2003 |
| 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 |
| 6484824 | Failure indicator for rolling cutter drill bit A bearing failure indicator for sealed and lubricated rolling cutter earth boring drill bits is disclosed. A plurality of cutting inserts, arranged in a plurality of rows, are secured in the rolling cone cutters. At least two of the rolling cone cutters a... | 11/26/2002 |
| 6450269 | Method and bit for directional horizontal boring A bit for directional boring according to the invention includes a bit body having a frontwardly facing sloped face effective for steering the bit in dirt. The sloped face defines a steering plane that defines an acute included angle relative to a lengthw... | 09/17/2002 |
| 6443246 | Long barrel inserts for earth-boring bit An earth-boring bit for attachment to a drill string has rotatable cones with rows of cutting elements. The cutting elements are arranged in generally circumferential rows on each of the cones and interference fit into apertures in the shell surface. The ... | 09/03/2002 |
| 6415687 | Rotary cone drill bit with machined cutting structure and method A rotary cone drill bit is provided with at least one cutter cone assembly having a machined cutting structure which will maintain an effective cutting profile despite abrasion, erosion and/or wear of the associated cutting elements. The machined cutting ... | 07/09/2002 |
| 6401839 | Roller cone bits, methods, and systems with anti-tracking variation in tooth orientation A roller cone drill bit in which the orientations of the teeth are varied within a single row, and/or between the heel row of one cone and the heel row of another cone, to prevent tracking.... | 06/11/2002 |
| 6213225 | Force-balanced roller-cone bits, systems, drilling methods, and design methods Roller cone drilling wherein the bit optimization process equalizes the downforce (axial force) for the cones (as nearly as possible, subject to other design constraints). Bit performance is significantly enhanced by equalizing downforce.... | 04/10/2001 |
| 6206116 | Rotary cone drill bit with machined cutting structure A rotary cone drill bit is provided with at least one cutter cone assembly having a machined cutting structure which will maintain an effective cutting profile despite abrasion, erosion and/or wear of the associated cutting elements. The machined cutting ... | 03/27/2001 |
| 6095262 | Roller-cone bits, systems, drilling methods, and design methods with optimization of tooth orientation A novel and improved roller cone drill bit and method of design are disclosed. A roller cone drill bit for drilling through subterranean formations having an upper connection for attachment to a drill string, and a plurality cutting structures rotatably m... | 08/01/2000 |
| 6062325 | Rotary drill bits A rotary drag-type drill bit, for drilling holes in subsurface formations, comprises a bit body having a leading face and a gauge region, a number of blades formed on the leading face of the bit and extending outwardly away from the axis of the bit so as ... | 05/16/2000 |
| 5979575 | Hybrid rock bit An earth-boring bit has a rotating cutter of a hybrid design. The bit has a bit body and a bearing shaft which is cantilevered downwardly and inwardly from the bit body. The cutter is mounted for rotation on the bearing shaft and has a plurality of cuttin... | 11/09/1999 |
| 5967245 | Rolling cone bit having gage and nestled gage cutter elements having enhancements in materials and geometry to optimize borehole corner cutting duty A rolling cone bit includes a cone cutter having a gage row and an adjacent nestled gage row of cutter elements that are positioned on gage so as to divide or share the borehole corner cutting duty. The wear resistance, hardness, toughness and shape of th... | 10/19/1999 |
| 5904212 | Gauge face inlay for bit hardfacing Steel bodies are manufactured in a production process that employs polystyrene patterns in a lost foam casting process. The patterns are machined to permit the formation of complex shapes that cannot be reproduced in simple patterns that are extractable f... | 05/18/1999 |
| 5881829 | Rolling-cutter mining bit with relatively soft formation cutting structure An earth-boring bit has a bit body with at least one bearing shaft depending inwardly and downwardly therefrom. A cutter is mounted for rotation on each bearing shaft and has a cutter shell surface and a plurality of cutting elements arranged on the shell... | 03/16/1999 |
| 5839526 | Rolling cone steel tooth bit with enhancements in cutter shape and placement A steel tooth bit includes one or more rolling cone cutters having a generally conical surface, a heel surface, and preferably a transition surface therebetween. A row of gage cutter elements are secured to the cone cutter on the transition surface and ha... | 11/24/1998 |
| 5671817 | Drill bit with dual reaming rows A rolling cutter drill bit has multiple rows of gage reaming inserts mounted in the gage face of the cutters. A first interlocking row of gage reaming inserts is positioned on the gage face of a cutter in close proximity to the gage row, such that the rea... | 09/30/1997 |
| 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 |
| 5353885 | Rock bit A rock bit is disclosed having a plurality of rolling cone cutters each having a gage row of inserts oriented to face the borehole bottom for crushing the same, and a second row of heel gage inserts which are oriented to face the borehole sidewall for scr... | 10/11/1994 |
| 5323865 | Earth-boring bit with an advantageous insert cutting structure An earth-boring bit is provided with three cutters, at least one of the three cutters are provided with a heel cutting structure defined by a plurality of heel inserts having crests thereon, the heel inserts being disposed in at least one substantially ci... | 06/28/1994 |
