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| Number | Title | Issue Date |
| 8177001 | Earth-boring tools including abrasive cutting structures and related methods A drill bit includes a bit body having a face on which two different types of cutters are disposed, the first type being cutting elements suitable for drilling at least one subterranean formation and the second type being at least one of an abrasive cutting structur... | 05/15/2012 |
| 8172011 | Cutting element A method of manufacturing a tool component, which is typically a cutting element or a gauge stone in a rotary drill bit, including a layer of ultra-hard abrasive material bonded to a substrate, the layer of ultra-hard abrasive material comprising a pair of opposed e... | 05/08/2012 |
| 8132633 | Self positioning cutter and pocket A self positioning cutter element and cutter pocket for use in a downhole tool having one or more cutting elements. The self positioning cutter element includes a substrate and a wear resistant layer coupled to the substrate. The cutter element includes a cutting su... | 03/13/2012 |
| 8127869 | Earth-boring tools, methods of making earth-boring tools and methods of drilling with earth-boring tools Earth-boring tools comprise a body having a face at a leading end. A plurality of cutting elements are disposed over the face and configured as a plurality of kerfing pairs comprising two or more cutting elements disposed at substantially the same radial position re... | 03/06/2012 |
| 8096373 | Rotary drill bits and drilling tools having protective structures on longitudinally trailing surfaces A rotary drill bit or other drilling tool for drilling or reaming through subterranean formation and comprising a body comprising a distal end and gage areas near a proximal end thereof and comprising longitudinally upward extensions of a plurality of blades or legs... | 01/17/2012 |
| 8079430 | Drill bits and tools for subterranean drilling, methods of manufacturing such drill bits and tools and methods of off-center drilling Drill bits for subterranean drilling comprising a bit body including at least one blade that includes a blade face comprising a contact zone and a sweep zone are disclosed. In particular, drill bits including at least one blade that extends at least partially over a... | 12/20/2011 |
| 8047309 | Passive and active up-drill features on fixed cutter earth-boring tools and related systems and methods Earth-boring tools include at least one up-drill feature disposed on a transition surface so as to be passive during down drilling and active during up drilling and/or back reaming operations. Systems for down drilling and up drilling with drill bits comprising one ... | 11/01/2011 |
| 8020641 | Drill bit with continuously sharp edge cutting elements A method of optimizing drill bit design and an optimized drill bit for drilling a well into an earth formation comprising a bit body; a number of blades spaced around the bit body, each blade having a curved outer edge and a forward face; a first row of cutter pocke... | 09/20/2011 |
| 8020640 | Impregnated drill bits and methods of manufacturing the same A drill bit that includes a body having a lower end face for engaging a rock formation is disclosed. The end face has a plurality of raised ribs extending from the face of the bit body and separated by a plurality of channels therebetween. At least one of the plural... | 09/20/2011 |
| 8016059 | Gage insert A hard formation drill bit that includes a plurality of gage cutting elements disposed on the at least one roller cone, wherein at least one of the plurality of gage cutting elements includes a cutting portion. The cutting portion includes a partially spherical lead... | 09/13/2011 |
| 7954571 | Cutting structures for casing component drillout and earth-boring drill bits including same A drill bit includes a bit body having a face on which two different types of cutters are disposed, the first type being cutting elements suitable for drilling at least one subterranean formation and the second type being at least one of an abrasive cutting structur... | 06/07/2011 |
| 7861809 | Rotary drag bit with multiple backup cutters A rotary drag bit includes a primary cutter row comprising at least one primary cutter and a multiple backup cutter group. The multiple backup cutter group comprises a first and second trailing cutter row, each comprising at least one cutter positioned to follow the... | 01/04/2011 |
| 7743857 | Cutting elements of gage row and first inner row of a drill bit A rolling cone drill bit is provided that has gage inserts on the first row from the bit axis to cut to full gage diameter that have a cutting portion enhanced with a layer of super abrasive material. The gage cutting surface has a center axis that is canted to be m... | 06/29/2010 |
| 7730976 | Impregnated rotary drag bit and related methods A drill bit is provided that employs a plurality of discrete, post-like, abrasive, particulate-impregnated cutting structures extending upwardly from the bit face. The cutting structures may be disposed on abrasive, particulate-impregnated blades that also define a ... | 06/08/2010 |
| 7703558 | Drilling tool for reducing cutter damage when drilling through formation changes, and methods of design and operation thereof A drilling tool including at least two cutting elements (e.g., redundant or upon a selected profile region) sized, positioned, and configured thereon so as to contact or encounter a change in at least one drilling characteristic of a subterranean formation along an ... | 04/27/2010 |
| 7686106 | Rock bit and inserts with wear relief grooves A rolling cone drill bit includes at least one cutter element comprising a base portion and a cutting portion extending from the base portion. The cutting portion includes a cutting surface with an apex defining an extension height and at least one rib extending fro... | 03/30/2010 |
| 7559383 | Hard material drilling head A solid hard material head for a percussion drilling tool rotatable about a rotational axis (A) in a rotational direction (ω), includes at least one main bit and at least one auxiliary bit (5), circumferentially offset relative to the at least one main bit (... | 07/14/2009 |
| 7441612 | PDC drill bit using optimized side rake angle A fixed cutter drill bit and a method for designing a fixed cutter drill bit includes simulating the fixed cutter drill bit drilling in an earth formation. A performance characteristic of the simulated fixed cutter drill bit is determined. A side rake angle distribu... | 10/28/2008 |
| 7434632 | Roller cone drill bits with enhanced drilling stability and extended life of associated bearings and seals Roller cone drill bits may be formed with cutting elements and cutting structures having cutting element profile angles selected to minimize cone wobble and improve life of associated bearings and seals. Normal force axes of the cutting elements may intersect with e... | 10/14/2008 |
| 7395885 | Cutting element with canted interface surface and bit body incorporating the same The present invention provides a cutting element having a cylindrical body having a canted end face on which is formed an ultra hard material layer and to a bit incorporating such cutting element. One or a plurality of transition layers may be provided between the u... | 07/08/2008 |
| 7370702 | Single mill casing window cutting tool and method An apparatus for cutting a window in a casing pipe in a well, having only a single mill with full gage primary cutting inserts of a very hard, highly wear resistant, material. The primary inserts can be protected from damage by forming each blade on the mill with an... | 05/13/2008 |
| 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 |
| 7367413 | Cutting elements of gage row and first inner row of a drill bit A rolling cone drill bit is provided that has gage inserts on the first row from the bit axis to cut to full gage diameter that have a cutting portion enhanced with a layer of super abrasive material. The gage cutting surface has a center axis that is canted to be m... | 05/06/2008 |
| 7360608 | Rotary drill bits including at least one substantially helically extending feature and methods of operation A rotary drill bit is disclosed, including at least one cutting element affixed thereto and configured to form a distinct borehole surface in response to drilling a subterranean formation. At least one substantially helically extending feature associated with the at... | 04/22/2008 |
| 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 |
| 7357196 | Method and system for predicting performance of a drilling system for a given formation A method and apparatus for predicting the performance of a drilling system for the drilling of a well bore in a given formation includes generating a geology characteristic of the formation per unit depth according to a prescribed geology model, obtaining specificat... | 04/15/2008 |
| 7356450 | Methods for designing roller cone bits by tensile and compressive stresses A method for designing a roller cone bit that includes steps of selecting design parameters for the roller cone bit, drilling parameters, and parameters of an earth formation, simulating drilling of the earth formation by the roller cone bit using the selected drill... | 04/08/2008 |
| 7341119 | Hydro-lifter rock bit with PDC inserts A rolling cone rock bit includes a plurality of PDC or other cutters mounted to the leg of the drill bit and positioned to cut the corner of the bottomhole. The plurality of cutters may be the primary cutting component at gage diameter, or may be redundant to gage t... | 03/11/2008 |
| 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 |
| 7316281 | Two-cone drill bit with enhanced stability A two-cone drill bit that exhibits improved stability. In one embodiment, the two-cone drill bit has a first and a second roller cone arranged to have a cone separation angle between about 145 degrees and about 166 degrees. In some embodiments, the two-cone drill bi... | 01/08/2008 |
| 7316279 | Polycrystalline cutter with multiple cutting edges A cutting element includes a layer of integrally bonded superabrasive particles disposed over a substrate. The layer has an outer circumference comprising at least one trough having a distinct cutting point on either side of the trough. A rock drilling drag bit inco... | 01/08/2008 |
| 7308957 | Fixed-head bit with stabilizing features A fixed-head drill bit includes a bit body having a plurality of cutting elements and at least one wear knuckle disposed on the bit body. Each cutting element includes a cutting surface defining a swept cutting profile when the bit is rotated about an axis. The at l... | 12/18/2007 |
| 7292967 | 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... | 11/06/2007 |
| 7261167 | Method and system for predicting performance of a drilling system for a given formation A method and apparatus for predicting the performance of a drilling system for the drilling of a well bore in a given formation is disclosed. The method generates a geology model of a given formation. The geology model includes a geology characteristic of the given ... | 08/28/2007 |
| 7261753 | Bonding structure and bonding method for cemented carbide element and diamond element, cutting tip and cutting element for drilling tool, and drilling tool A cutting tip for a drilling tool includes a cemented carbide cutting base 11, a diamond element 12 supported by the cutting base 11, and a bonding layer formed between the cutting base 11 and the diamond element 12 in order to bon... | 08/28/2007 |
| 7243745 | Cutting elements and rotary drill bits including same A cutting element for a rotary drill bit that has a superabrasive member joined to a substrate at a three-dimensional interface is disclosed. The interface of the cutting element preferably incorporates a first ring pattern comprising a plurality of circumferentiall... | 07/17/2007 |
| 7237628 | Fixed cutter drill bit with non-cutting erosion resistant inserts The present invention is directed to a drill bit with non-cutting erosion resistant inserts. In one illustrative embodiment, the apparatus comprises a matrix drill bit body comprising a plurality of blades, a plurality of cutting elements positioned on each of the b... | 07/03/2007 |
| 7234550 | Bits and cutting structures An insert for a drill bit which includes a diamond impregnated body, and a shearing portion disposed on said body is shown. In addition, a method for forming a drill bit that includes (a) forming a shearing portion on a diamond-impregnated insert body to form a cutt... | 06/26/2007 |
| 7216565 | Methods of manufacturing and repairing steel body rotary drill bits including support elements affixed to the bit body at least partially defining cutter pocket recesses A steel body rotary drag bit for drilling a subterranean formation includes a plurality of support elements affixed to the bit body, each forming at least a portion of a cutting element pocket. Each of a plurality of cutting elements has a substantially cylindrical ... | 05/15/2007 |
| 7188692 | Superabrasive cutting elements having enhanced durability, method of producing same, and drill bits so equipped A superabrasive cutting element including a diamond or other superabrasive material table having a peripheral cutting edge defined by at least two adjacent chamfers having an arcuate surface substantially tangent to each of the at least two chamfers interposed there... | 03/13/2007 |
