Nonsymmetrical Bit (e.g., Nontracking) Patents (Class 175/376)
  • Patent number: 10367464
    Abstract: A digital synthesizer is described that comprises: a ramp generator configured to generate a signal of frequency control words, FCW, that describes a desired frequency modulated continuous wave; a digitally controlled oscillator, DCO configured to receive the FCW signal; a feedback loop; and a phase comparator coupled to the ramp generator and configured to compare a phase of the FCW output from the ramp generator and a signal fed back from the DCO via the feedback loop and output a N-bit oscillator control signal. The digital synthesizer comprises a gain circuit coupled to a multiplier located between the ramp generator and the DCO and configured to apply at least one gain from a plurality of selectable gains to the N-bit oscillator control signal that set a selectable loop gain of the digital synthesizer and thereby set a selectable loop bandwidth; and calculate and apply a gain offset dependent upon the selected gain that is adapted when the selected gain is changed.
    Type: Grant
    Filed: July 10, 2017
    Date of Patent: July 30, 2019
    Assignee: NXP USA, Inc.
    Inventors: Didier Salle, Olivier Vincent Doare, Birama Goumballa, Cristian Pavao Moreira
  • Patent number: 9016407
    Abstract: A drill bit for drilling a borehole in earthen formations comprises a bit body including a cone region, a shoulder region, and a gage region. In addition the bit comprises a first primary blade and a second primary blade. Further, the bit comprises a plurality of primary cutter elements mounted to the first primary blade in different radial positions. Still further, the bit comprises a plurality of primary cutter elements mounted to the second primary blade in different radial positions. Moreover, a first primary cutter element of the plurality of primary cutter elements on the first primary blade and a first primary cutter element of the plurality of primary cutter elements on the second primary blade are each positioned in the cone region and are redundant. The shoulder region has a total cutter redundancy percentage that is less than a total cutter redundancy percentage in the cone region.
    Type: Grant
    Filed: December 5, 2008
    Date of Patent: April 28, 2015
    Assignee: Smith International, Inc.
    Inventors: Bala Durairajan, Carl M. Hoffmaster, Michael G. Azar
  • Patent number: 8672060
    Abstract: A drill bit includes a bit body comprising at its upper end a connection adapted to connect to a drill string and at its lower end a plurality of journals extending downwardly and radially outward from a longitudinal axis of the bit. A plurality of roller cones are rotatably mounted on the plurality of journals and at least three rows of cutting elements are disposed on each of the plurality of roller cones. The outermost row of the at least three rows of cutting elements has an extension height to diameter ratio greater than a mid row, and the mid row has an extension height to diameter ratio greater than an innermost row.
    Type: Grant
    Filed: July 27, 2010
    Date of Patent: March 18, 2014
    Assignee: Smith International, Inc.
    Inventors: Prabhakaran K. Centala, Zhehua Zhang
  • Patent number: 8579051
    Abstract: Described herein are roller cone drill bits and modified roller cones for use in drilling subterranean earth formations, and more specifically roller cone drill bits and roller cones having optimized spear point designs and blade orientations on at least one of the roller cones for reduced tracking and/or increased drilling performance during bit use. The roller cone drill bits include a bit body with a longitudinal axis, one or more bit legs depending from the body, and at least one roller cone attached to each of the bit legs and able to rotate with respect to the bit body, wherein at least one of the roller cones includes a spear point at the cone apex having two or more cutting blades, the cutting blades being oriented at a variety of non-equal, asymmetric angles about a central cone axis with respect to each other, such that tracking during drilling using the drill bit is minimized or eliminated.
    Type: Grant
    Filed: August 6, 2010
    Date of Patent: November 12, 2013
    Assignee: Baker Hughes Incorporated
    Inventors: Robert J. Buske, James Florey
  • Patent number: 8430187
    Abstract: Drilling a sidetrack wellbore out of the side of an existing wellbore utilizing a drillable billet having a path formed in the billet to lead a bi-centered drillbit to kick-out from the wellbore and form a sidetrack wellbore. The bi-centered bit is arranged for the lands of the pilot section to follow the path of the billet while the wings of the ream out a portion of the billet and also ream out the earth to form the full dimension sidetrack wellbore. The bi-centered bit is used to drill the sidetrack wellbore to the target zone so that the entire drilling process extends from the existing wellbore to the target zone without a mandatory withdrawal of the drillstring from the wellbore.
    Type: Grant
    Filed: February 18, 2010
    Date of Patent: April 30, 2013
    Assignee: ConocoPhillips Company
    Inventor: David D. Hearn
  • Patent number: 8061453
    Abstract: A drill bit for drilling a borehole in earthen formations. In an embodiment, the bit comprises a bit body having a bit axis and a bit face. In addition, the bit comprises a pin end extending from the bit body opposite the bit face. Further, the bit comprises a plurality of gage pads extending from the bit body, wherein each gage pad includes a radially outer gage-facing surface. The gage-facing surfaces of the plurality of gage pads define a gage pad circumference that is centered relative to a gage pad axis, the gage pad axis being substantially parallel to the bit axis and offset from the bit axis.
    Type: Grant
    Filed: May 24, 2007
    Date of Patent: November 22, 2011
    Assignee: Smith International, Inc.
    Inventors: Peter T. Cariveau, Bala Durairajan
  • Patent number: 7866417
    Abstract: An earth boring drill bit comprising a milled cutter having rows of teeth hardfacing guides on the cutter. Hardfacing is applied between adjacent teeth hardfacing guides to form a cutting element. The hardfacing may include an annular body with ridges that outwardly project from the body.
    Type: Grant
    Filed: October 21, 2008
    Date of Patent: January 11, 2011
    Assignee: Baker Hughes Incorporated
    Inventors: Robert J. Buske, James L. Overstreet
  • Patent number: 7845435
    Abstract: A hybrid drill bit having both roller cones and fixed blades is disclosed, and a method of drilling. The cutting elements on the fixed blades form a continuous cutting profile from the perimeter of the bit body to the axial center. The roller cone cutting elements overlap with the fixed cutting elements in the nose and shoulder sections of the cutting profile between the axial center and the perimeter. The roller cone cutting elements crush and pre- or partially fracture formation in the confined and highly stressed nose and shoulder sections.
    Type: Grant
    Filed: April 2, 2008
    Date of Patent: December 7, 2010
    Assignee: Baker Hughes Incorporated
    Inventors: Anton F. Zahradnik, Rudolf Carl Pessier, Don Q. Nguyen, Michael Steven Damschen, Karlos B. Cepeda, Tim King Marvel, Matt Meiners
  • Patent number: 7841426
    Abstract: A hybrid drill bit having both roller cones and fixed blades is disclosed. The cutting elements on the fixed blades form a continuous cutting profile from the perimeter of the bit body to the axial center. The roller cone cutting elements overlap with the fixed cutting elements in the nose and shoulder sections of the cutting profile between the axial center and the perimeter. The roller cone cutting elements crush and pre-fracture formation in the weak and highly stressed nose and shoulder sections.
    Type: Grant
    Filed: April 5, 2007
    Date of Patent: November 30, 2010
    Assignee: Baker Hughes Incorporated
    Inventors: Anton F. Zahradnik, Rolf Carl Pessier, Don Q. Nguyen, Michael Steven Damschen, Karlos B. Cepeda, Tim King Marvel, Matt Meiners
  • Patent number: 7819208
    Abstract: An earth-boring bit comprising a bit body configured at its upper extent for connection into a drillstring. A selected number of fixed blades extend downward from the bit body and a selected number of rolling cutters are mounted for rotation on the bit body. A plurality of rolling-cutter cutting elements are arranged on each rolling cutter and a plurality of fixed-blade cutting elements are arranged on each fixed blade. The selected number of fixed blades exceeds the selected number of rolling cutters by at least one.
    Type: Grant
    Filed: July 25, 2008
    Date of Patent: October 26, 2010
    Assignee: Baker Hughes Incorporated
    Inventors: Rudolf Carl Pessier, Don Q. Nguyen, Michael Steven Damschen, Michael L. Doster
  • Patent number: 7681670
    Abstract: A two-cone drill bit with a hydraulic arrangement that can be used for one or more of the following: cleaning roller cones, impinging on a hole bottom, or inducing a helical flow field. A two-cone drill bit having a bit body formed from two leg sections and two spacing members; methods of manufacturing a two-cone drill bit; and methods of improving hydraulics of a two-cone drill bit are disclosed.
    Type: Grant
    Filed: September 10, 2004
    Date of Patent: March 23, 2010
    Assignee: Smith International, Inc.
    Inventors: Prabhakaran K. Centala, James L. Larsen, Mohammed Boudrare
  • Patent number: 7647991
    Abstract: An earth boring bit has cutting elements arranged to avoid tracking. The bit has a bit body having a bit axis of rotation. First, second and third cones are rotatably mounted to the bit body, each of the cones having a plurality of rows of cutting elements including a heel row and an adjacent row. The heel row of the first cone has at least equal the number of cutting elements as the heel rows of the other cones. The adjacent row of the second cone has at least 90 percent as many cutting elements as the heel row of the first cone. The heel row of the third cone has a pitch that is in the range from 20-50% greater than the heel rows of the first cone.
    Type: Grant
    Filed: May 29, 2007
    Date of Patent: January 19, 2010
    Assignee: Baker Hughes Incorporated
    Inventors: Floyd Felderhoff, Matthew R. Isbell, Rudolf C. Pessier
  • Patent number: 7621348
    Abstract: A bit having improved dropping tendencies includes a first plurality of cutters in an active region and a second plurality of cutters in a passive region. The second plurality of cutters has unique radial positions with respect to the first plurality of cutters. The first and the second pluralities of cutters also have cutting tips that extend to the primary cutting profile of the bit. A third plurality of cutters is located in the passive region with cutting tips positioned recessed from the primary cutting profile. A forth plurality of cutters is positioned as back up cutters in the active, region and includes cutters positioned in radial locations such that they overlap, when viewed in rotated profile, with cutters in the third plurality of cutters. The fourth plurality of cutters has cutting tips positioned to extend to the primary cutting profile. The cutters on the bit are arranged such that an imbalance force vector exists on the bit when used to drill though earth formation.
    Type: Grant
    Filed: October 2, 2007
    Date of Patent: November 24, 2009
    Assignee: Smith International, Inc.
    Inventors: Carl M. Hoffmaster, Michael G. Azar
  • Publication number: 20090260890
    Abstract: The harmful effects of tracking are reduced for a drill bit having roller cones with at least one of the outermost rows of active teeth containing one or more teeth having a height that does not extend to the height of at least one of the outermost rows on another roller cone on the bit. The crest on this tooth may have a length in a circumferential direction that is wider than an overall width of the tooth in the outer to inner direction. The invention may be used on any cutter row, not just the outermost row. The design may be used on a different roller cone or row, or more than one cutter row. The anti-tracking feature may be located between the leading and trailing edges of the tooth on one or more roller cones.
    Type: Application
    Filed: April 17, 2009
    Publication date: October 22, 2009
    Applicant: BAKER HUGHES INCORPORATED
    Inventors: Robert J. Buske, James L. Overstreet, Rudolf Carl Pessier
  • Patent number: 7549490
    Abstract: A drill bit having cutting elements disposed on a roller cone surface in a non-linear pattern, wherein at least one of the cutting elements is asymmetrical to its axis of orientation. Also, a method for selecting and adjusting a cutting element orientation based on crater profile geometry which results in increased bottom hole coverage.
    Type: Grant
    Filed: November 7, 2006
    Date of Patent: June 23, 2009
    Assignee: Smith International, Inc.
    Inventors: Scott D. McDonough, Amardeep Singh
  • Patent number: 7549488
    Abstract: 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 bit has a plurality of cutting elements arranged on the roller cones such that a bottom hole coverage greater than about 17 percent is achieved per revolution of the two-cone drill bit.
    Type: Grant
    Filed: January 7, 2008
    Date of Patent: June 23, 2009
    Assignee: Smith International, Inc.
    Inventors: Mohammed Boudrare, Prabhakaran K. Centala
  • Patent number: 7497281
    Abstract: 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 formations with varying amounts of hardness. The cutting elements and cutting structures may also be optimized to reduce tracking and increase wear resistance.
    Type: Grant
    Filed: February 6, 2007
    Date of Patent: March 3, 2009
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Shilin Chen, James S. Dahlem
  • Patent number: 7445063
    Abstract: A drill bit assembly for direct removal of rock with a rotatable bit assembly (5) that includes a plurality of cutters or choppers (7). According to the invention, an number of cutters (7) are so disposed in relation to each other or the bit assembly (5) that a subsequent cutter (7b), seen in the direction of rotation, will engage an edge created by the action of preceding cutter (7a).
    Type: Grant
    Filed: April 7, 2004
    Date of Patent: November 4, 2008
    Assignee: Atlas Copco Secoroc AB
    Inventor: Lars Holmgren
  • Patent number: 7299887
    Abstract: This invention relates to a single cone bit with offset axis and composite cones for oil and gas drilling, mining and other subterranean drilling operations. The bit consists of a head body and a cone. The cone section has a shape of composite cones. The outer circumference of the cone is composed of from back face of the cone to top of the cone an extended gage surface, an outer cone surface and a main cone surface. A plurality of cutting elements is mounted onto each cone surface. A head journal at lower end of the head body is for rotatablely connection with the cone. Between the axis of head journal and the axis of the bit, there is an offset value d along rotating direction of the cone. A gage pad is arranged on head body at a location opposite to the offset direction of the head journal. The gage pad is fitted with inserts or hardfaced with wear resistant alloy to prevent bit from whirling and prevent head body from being worn out and to ensure gage protection.
    Type: Grant
    Filed: March 26, 2003
    Date of Patent: November 27, 2007
    Assignee: Kingdream Public Ltd. Co.
    Inventors: Xuezhong Liu, Yan Zhao
  • Patent number: 7234549
    Abstract: 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 designs. In one example, this method is used to calculate a score for an arrangement based on a comparison of an expected bottomhole pattern for the arrangement with a preferred bottomhole pattern. The use of this method has lead to roller cone drill bit designs that exhibit reduce tracking over prior art bits.
    Type: Grant
    Filed: May 26, 2004
    Date of Patent: June 26, 2007
    Inventors: Scott D. McDonough, Amardeep Singh, Daniel W. Brietzke
  • Patent number: 7195086
    Abstract: An earth boring drill bit is constructed having rotatable cutter for forming a borehole in earth. At least one circumferential row of cutting elements is optimized to create overbreak of rock and eliminate tracking, wherein selected pitches have mathematically determined pairs and the absolute difference between the selected pitch and its pair is greater than 10% of the difference between maximum and minimum pitch for that circumferential row. Furthermore, cutting elements are placed along pre-selected generatrices with deviation from said generatrices, which is less than half the maximum pitch of circumferential rows occupied by said cutting element. The present invention eliminates tracking and reduces detrimental axial resonance frequency vibration while reducing cutting element count, including tungsten-carbide inserts, as compared to conventional roller cutter drill bits used for oil, gas and shot hole drilling wells and simultaneously increases footage drilled, drilling speed, and durability.
    Type: Grant
    Filed: January 30, 2004
    Date of Patent: March 27, 2007
    Inventors: Anna Victorovna Aaron, Viktor Lytvynenko
  • Patent number: 7152701
    Abstract: A roller cone drill bit includes a bit body adapted to be coupled to a drill string, a bearing journal depending from the bit body, and a single roller cone rotatably attached to the bearing journal. The single roller cone has a plurality of cutting elements, where at least one of the plurality of cutting elements is formed of an inner region that is at least partially surrounded by an outer region, where the inner region is more abrasive resistant than the outer region. Such an arrangement in a single roller cone bit allows the at least one cutting element to be “self-sharpening.
    Type: Grant
    Filed: August 17, 2004
    Date of Patent: December 26, 2006
    Assignee: Smith International, Inc.
    Inventors: Richard Butland, John J. Herman, Ronald Birne-Browne, Per Nese, Louis Loiselle, J. Daniel Belnap
  • Patent number: 6863138
    Abstract: A roller bit is provided having super-abrasive inserts on cutting portions to assure that the bit will maintain cutting efficiency. In the described exemplary bits, the axes of the roller cones are also offset by a significant or “high offset” amount from the central longitudinal axis of the bit, thereby providing for increased shearing and grinding action by the bit. The use of high offset in combination with super-abrasive inserts provides for optimal bit cutting designs which provide increases in ROP while preserving the bit's ability to hold gage and remain durable to achieve acceptable footage. Minimum high offsets and preferred high offsets are described for various bit sizes, designs and nomenclatures, including milled tooth bits and insert-type bits designed for use in soft-through-medium formation hardnesses as well as formations with greater hardnesses.
    Type: Grant
    Filed: December 11, 2001
    Date of Patent: March 8, 2005
    Assignee: Smith International, Inc.
    Inventor: Michael Allen Siracki
  • Patent number: 6851493
    Abstract: A PLL synthesizer (100) includes a gear-shifting scheme of the PLL loop gain constant, ?. During frequency/phase acquisition, a larger loop gain constant, ?1 is used such that the resulting phase error is within limits. After the frequency/phase gets acquired, the developed phase error, which is a rough indication of the frequency offset is in a steady-state condition. While transitioning into the tracking mode, the DC offset is added to the DCO tuning signal preferably the DC offset is added to the phase error signal and the loop constant is reduced from ?1 to ?2. This scheme provides for hitless operation, while requiring a low dynamic range of the phase detector (101).
    Type: Grant
    Filed: December 1, 2000
    Date of Patent: February 8, 2005
    Assignee: Texas Instruments Incorporated
    Inventors: Robert B. Staszewski, Kenneth J. Maggio
  • Patent number: 6827161
    Abstract: 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-axisymmetric cutting element on the bit is adjusted and the simulating the drilling and determining the at least one performance parameter are repeated. The adjusting and simulating the drilling are repeated until the at least one performance parameter is determined to be at an optimum value. In one embodiment, the performance parameter includes rate of penetration.
    Type: Grant
    Filed: January 28, 2003
    Date of Patent: December 7, 2004
    Assignee: Smith International, Inc.
    Inventors: Amardeep Singh, Sujian Huang, Scott McDonough
  • Publication number: 20030136588
    Abstract: A roller cone drill bit having selected left hand walk is disclosed. The bit includes a bit body adapted to couple to a drill string, and a plurality of legs depending from the bit body. Each leg has a roller cone rotatably mounted thereon. Each cone includes a plurality of cutting elements thereon. At least one cone has a nose point of its profile displaced radially inward with respect to a nose point of the profile of the other cones. A roller cone drill bit having selected right hand walk is also disclosed. The bit include a bit body adapted to couple to a drill string, and a plurality of legs depending from the bit body. Each leg has a roller cone rotatably mounted thereon, each cone including a plurality of cutting elements thereon defining a profile. At least one cone has a nose point of the profile displaced radially outward with respect to a nose point of the profile of the other cones.
    Type: Application
    Filed: January 24, 2002
    Publication date: July 24, 2003
    Inventors: David Truax, Douglas Rock, Graham Mensa-Wilmot
  • Patent number: 6588515
    Abstract: The invention provides a rock drilling bit with a plurality of cutting teeth raked into the cut of the drilling bit. Such teeth are oriented at an angle of at least about 30 degrees relative to an imaginary line normal to a front surface of the cutting head from which the cutting teeth project. Such an arrangement provides the desired shear cutting force against the rock face while simultaneously reducing the shock and vibration applied to sonde housing and the drill string. The bit according to the invention may further incorporate a rear, frustoconical crushing surface that defines a space or zone crescent-shaped in cross-section that narrows from front to rear, and an improved replacable tooth for use on a rock drilling bit.
    Type: Grant
    Filed: October 26, 2001
    Date of Patent: July 8, 2003
    Assignee: Earth Tool Company, L.L.C.
    Inventors: Steven W. Wentworth, Robert F. Crane
  • Publication number: 20030106721
    Abstract: 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-axisymmetric cutting element on the bit is adjusted and the simulating the drilling and determining the at least one performance parameter are repeated. The adjusting and simulating the drilling are repeated until the at least one performance parameter is determined to be at an optimum value. In one embodiment, the performance parameter includes rate of penetration.
    Type: Application
    Filed: January 28, 2003
    Publication date: June 12, 2003
    Inventors: Amardeep Singh, Sujian Huang, Scott McDonough
  • Patent number: 6561292
    Abstract: One aspect of the invention is a roller cone drill bit including a bit body having three legs depending therefrom, each leg having a journal, a roller cone rotatably mounted on each journal, and each roller cone having a plurality of cutting elements thereon. The cutting elements are arranged in rows on each cone. The rows include at least a gage row and a first row interior of the gage row. The first interior row is staggered with respect to the gage row on each of the three cones. Another aspect of the invention is a roller cone drill bit including a bit body having three legs depending therefrom. Each leg has a journal, a roller cone rotatably mounted on each journal, and each roller cone has a plurality of cutting elements thereon. The cutting elements are arranged in rows on each cone. The rows include at least a gage row and a first row interior of the gage row. The first interior row is staggered with respect to the gage row on at least two of the three cones.
    Type: Grant
    Filed: November 3, 2000
    Date of Patent: May 13, 2003
    Assignee: Smith International, Inc.
    Inventor: Gary R. Portwood
  • Patent number: 6527068
    Abstract: 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-axisymmetric cutting element on the bit is adjusted and the simulating the drilling and determining the at least one performance parameter are repeated. The adjusting and simulating the drilling are repeated until the at least one performance parameter is determined to be at an optimum value. In one embodiment, the performance parameter includes rate of penetration.
    Type: Grant
    Filed: August 16, 2000
    Date of Patent: March 4, 2003
    Assignee: Smith International, Inc.
    Inventors: Amardeep Singh, Sujian Huang, Scott McDonough
  • Publication number: 20020166703
    Abstract: A method and apparatus for reaming or enlarging a borehole with the ability to drill cement, cement float equipment, and debris out of a casing without substantial damage to the casing interior or the reaming apparatus. The reaming apparatus also provides enhanced protection from contact with the casing wall for selected structural features and elements thereof.
    Type: Application
    Filed: April 10, 2002
    Publication date: November 14, 2002
    Inventors: W. Gregory Presley, Christopher S. Charles, Steven R. Radford, Matthew J. Meiners, Mark E. Morris, D. Jay Clinkscales, Jeffrey B. Lund, Robert A. Laing, Matthew D. Mumma
  • Patent number: 6439326
    Abstract: A drill bit including a roller cone and fixed cutters positioned external to the roller cone and radially from the bit axis of rotation. The roller cone is located so that a drill diameter of the cone is substantially concentric with an axis of rotation of the bit. The fixed cutters can be made of tungsten carbide, polycrystalline diamond, boron nitride, or any other superhard material. The fixed cutters are positioned to either maintain the hole diameter drilled by the roller cone or to drill a larger diameter hole than the hole drilled by the roller cone. The single roller cone may be located in the center of a multi-cone bit arrangement or in the center of a PDC bit to assist in drilling the center of a wellbore. The single roller cone may be used to form a bi-center bit in combination with a reaming section. The single roller cone may also be located on an independent sub that is removably attached to the bit body.
    Type: Grant
    Filed: April 10, 2000
    Date of Patent: August 27, 2002
    Assignee: Smith International, Inc.
    Inventors: Sujian Huang, Chris E. Cawthorne
  • Patent number: 6422327
    Abstract: A drill bit for cutting a formation that tends to form ridges comprises: a bit body having a bit axis, a plurality of rolling cone cutters rotatably mounted on the bit body, with each rolling cone cutter having a generally conical surface, a plurality of primary cutter elements extending from one of the cone cutters in a first row, each primary cutter element having an outer side and an inner side, and a plurality of ridge-cutting cutter elements extending from the same cone cutter, the first plurality of ridge-cutting cutter elements being positioned adjacent to the outer side of the first row of primary cutter elements. Each ridge-cutting cutter can be, but is not necessarily, on the same cone cutter as the primary cutter element adjacent to which it cuts, and is preferably positioned on a land or flat adjacent to that primary cutter element.
    Type: Grant
    Filed: November 3, 2000
    Date of Patent: July 23, 2002
    Assignee: Smith International, Inc.
    Inventors: Gary Ray Portwood, J. Albert Sue
  • Publication number: 20020070053
    Abstract: A roller bit is provided having super-abrasive inserts on cutting portions to assure that the bit will maintain cutting efficiency. In the described exemplary bits, the axes of the roller cones are also offset by a significant or “high offset” amount from the central longitudinal axis of the bit, thereby providing for increased shearing and grinding action by the bit. The use of high offset in combination with super-abrasive inserts provides for optimal bit cutting designs which provide increases in ROP while preserving the bit's ability to hold gage and remain durable to achieve acceptable footage. Minimum high offsets and preferred high offsets are described for various bit sizes, designs and nomenclatures, including milled tooth bits and insert-type bits designed for use in soft-through-medium formation hardnesses as well as formations with greater hardnesses.
    Type: Application
    Filed: October 11, 2001
    Publication date: June 13, 2002
    Inventor: Michael Allen Siracki
  • Patent number: 6401839
    Abstract: 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.
    Type: Grant
    Filed: March 10, 2000
    Date of Patent: June 11, 2002
    Assignee: Halliburton Energy Services, Inc.
    Inventor: Shilin Chen
  • Patent number: 6374930
    Abstract: The invention is directed to a roller cone drill for drilling earth formations. The drill bit includes a bit body and a plurality of roller cones attached to the bit body and able to rotate with respect to the bit body. The drill bit further includes a plurality of teeth disposed on each of the roller cones such that the number of teeth on each cone differs by two or fewer from the number of teeth on each of the other cones. In one preferred embodiment, the drill bit includes three roller cones. In another preferred embodiment, the teeth of the bit are arranged on each cone so that teeth on adjacent cones intermesh between the cones. In another preferred embodiment, the drill bit includes a first cone, a second cone, and a third cone, and the number of teeth on each of the cones is 17, 16, and 18, respectively.
    Type: Grant
    Filed: June 8, 2000
    Date of Patent: April 23, 2002
    Assignee: Smith International, Inc.
    Inventors: Amardeep Singh, Sujian Huang
  • Patent number: 6367569
    Abstract: An earth-boring bit for removing rock and earthen formation while being rotated includes a generally circular bit body. A plurality of saddle members are mounted to the bit body, each saddle member supporting and receiving a journal member. A cutter shell is rotatably mounted on bearings disposed on each journal member. A kerf ring is releasably secured to each cutter shell. Each kerf ring includes at least two kerfs circumferentially disposed around the rings, each kerf having a longitudinal axis and a pair of opposing sides that converge to define a crest for receiving inserts for disintegration of formation material. The kerfs are oriented on the kerf ring such that the longitudinal axes of the inserts diverge as the kerfs extend radially outward from the kerf ring. The inserts embedded in each kerf are generally flush with the sides of the kerf and protrude from the crest.
    Type: Grant
    Filed: June 9, 2000
    Date of Patent: April 9, 2002
    Assignee: Baker Hughes Incorporated
    Inventor: Howard J. Walk
  • Publication number: 20020017401
    Abstract: 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, a plurality of gage-cutting cutter elements positioned in a first fanned-gage row on a first one of the one cutters, and a plurality of gage-cutting cutter elements positioned in a second fanned-gage row on a second one of the one cutters, wherein the gage-cutting cutter elements on the bit define a gage curve and cutter elements in the first fanned-gage row and the second fanned-gage row contact the gage curve at different points. In one embodiment, each cutter element has an extension, and the extensions of the uppermost fanned-gage row cutter element and the first inner row cutter element define a step distance such that the ratio of the step distance to the extension of the first inner row cutter element is greater than 0.5.
    Type: Application
    Filed: May 18, 2001
    Publication date: February 14, 2002
    Inventors: Ying Xiang, James Carl Minikus
  • Patent number: 6345673
    Abstract: A roller bit is provided having super-abrasive inserts on cutting portions to assure that the bit will maintain cutting efficiency. In the described exemplary bits, the axes of the roller cones are also offset by a significant or “high offset” amount from the central longitudinal axis of the bit, thereby providing for increased shearing and grinding action by the bit. The use of high offset in combination with super-abrasive inserts provides for optimal bit cutting designs which provide increases in ROP while preserving the bit's ability to hold gage and remain durable to achieve acceptable footage. Minimum high offsets and preferred high offsets are described for various bit sizes, designs and nomenclatures, including milled tooth bits and insert-type bits designed for use in soft-through-medium formation hardnesses as well as formations with greater hardnesses.
    Type: Grant
    Filed: November 20, 1998
    Date of Patent: February 12, 2002
    Assignee: Smith International, Inc.
    Inventor: Michael Allen Siracki
  • Publication number: 20020000335
    Abstract: 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-groove are arranged on the cone, the difference is that there are 2 to 3 compacts having the cylindrical body being arranged on the top of the base teeth along the teeth direction. The cutting performance of the present invention is similar to that of the oblate compacts, and, by utilizing the conventional cylindrical compacts, it is not only easy to process and with low manufacturing cost, but the bit can effectively drill through the stringered earth formation with both hard and soft formation and thus better economic benefit from drilling the stringered formation can be obtained.
    Type: Application
    Filed: April 3, 2001
    Publication date: January 3, 2002
    Inventor: Zhihua Chen
  • Patent number: 6321858
    Abstract: An improved drill bit for directional drilling includes a housing or headpiece having means at a rear end thereof for mounting the bit on a trailing component of a drill head, and passages for ejection of drilling fluid into a borehole. A first axle is mounted to extend forwardly from a front end of the housing, and a first roller is rotatably mounted on the first axle. The first roller has cutting projections such as carbide studs thereon and extends outside of the outer diameter of the housing by a distance which defines the size of the borehole when the drill bit is rotated over 360 degrees. A second axle is mounted to extend from the front end of the housing, and a second roller is rotatably mounted on the second axle at a position offset from the first axle. The second roller extends slightly outside of the outer diameter of the housing, but by a distance less than the distance the first roller extends outside of the housing.
    Type: Grant
    Filed: January 28, 2000
    Date of Patent: November 27, 2001
    Assignee: Earth Tool Company, L.L.C.
    Inventors: Steven W. Wentworth, Robert F. Crane
  • Patent number: 6308789
    Abstract: A drill bit that is arranged to change the direction of drilling. A cone head is rotatably mounted on a shank portion extending from an elongate housing. When the housing is rotated, the cone head generates a concave hole. When a change in direction is required, the housing is rotated a few degrees in one direction and then counter-rotated in the opposite direction. This generates a partial but redirected pilot hole that is also substantially concave in configuration. Continued full rotation causes the drill bit to follow the partial pilot hole in the new direction.
    Type: Grant
    Filed: October 26, 1999
    Date of Patent: October 30, 2001
    Inventors: Neal A. Kuenzi, Rodney R. Kuenzi
  • Patent number: 6263983
    Abstract: The invention provides an improved apparatus for directional boring and in particular an improved system for boring through hard and rocky substrates frequently encountered when boring under obstacles such as roadways. According to one aspect of the invention, a directional drilling apparatus includes a drilling head having a front face angled relative to the lengthwise axis of the tool and configured for steering the drilling apparatus, a housing having an internal chamber for mounting an electronic locating device therein rearwardly of the drilling head for transmitting a signal indicating the orientation of the angled face of the drilling head, and a joint at which the drilling head is removably mounted to the housing of the locating device.
    Type: Grant
    Filed: August 12, 1999
    Date of Patent: July 24, 2001
    Assignee: Earth Tool Company, L.L.C.
    Inventors: Steven W. Wentworth, Robert F. Crane
  • Patent number: 6176329
    Abstract: A drill bit for cutting a formation that tends to form ridges comprises: a bit body having a bit axis, a plurality of rolling cone cutters rotatably mounted on the bit body, with each rolling cone cutter having a generally conical surface, a plurality of primary cutter elements extending from one of the cone cutters in a first row, each primary cutter element having an outer side and an inner side, and a plurality of ridge-cutting cutter elements extending from the same cone cutter, the first plurality of ridge-cutting cutter elements being positioned adjacent to the outer side of the first row of primary cutter elements. Each ridge-cutting cutter can be, but is not necessarily, on the same cone cutter as the primary cutter element adjacent to which it cuts, and is preferably positioned on a land or flat adjacent to that primary cutter element.
    Type: Grant
    Filed: August 5, 1998
    Date of Patent: January 23, 2001
    Assignee: Smith International, Inc.
    Inventors: Gary Ray Portwood, J. Albert Sue
  • Patent number: 6167975
    Abstract: A one cone drill bit is equipped with multiple jet flow guiding grooves along the cone. The multiple grooves connects to a circular groove axially centered on the nose end portion of the cone. The circular groove sweep the cuttings and mud flow across the drilled face and up the well borehole.
    Type: Grant
    Filed: April 1, 1999
    Date of Patent: January 2, 2001
    Assignee: Rock Bit International, Inc.
    Inventor: Roy Dee Estes
  • Patent number: 6095262
    Abstract: 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 mounted on arms extending downward from the connection. A number of teeth are located in generally concentric rows on each cutting structure. The actual trajectory by which the teeth engage the formation is mathematically determined. A straight-line trajectory is calculated based on the actual trajectory. The teeth are positioned in the cutting structures such each tooth having a designed engagement surface is oriented perpendicular to the calculated straight-line trajectory.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: August 1, 2000
    Assignee: Halliburton Energy Services, Inc.
    Inventor: Shilin Chen
  • Patent number: 6039131
    Abstract: A PDC bit for cutting a hole below a point in a formation, the diameter of the hole being greater than the diameter of the hole above the point, comprising: a bit body having an axis of rotation, a first cutting portion having a first radial extent from the axis of rotation, a second cutting portion that is not axially spaced apart from the first cutting portion and that has a second radial extent that is greater than said first radial extent, wherein the total imbalance forces resulting from engagement of said first and said second cutting portions with the formation are balanced such that the resulting torque on the bit is minimized and in particular, the component of the torque on the bit about an axis normal to the axis of rotation is minimized. In some embodiments, the bit has a central recessed portion on its face, which receives a short "core" portion that enhances stabilization of the bit.
    Type: Grant
    Filed: August 25, 1997
    Date of Patent: March 21, 2000
    Assignee: Smith International, Inc.
    Inventor: Timothy P. Beaton
  • Patent number: RE37450
    Abstract: Directional boring bits (1100, 1200) are disclosed which have at least one roller cone (1202, 1104) and also each define a deflecting surface (1104) for deflecting the boring bit when the bit is advanced without rotation. The borehole can be curved by pushing the bit forward without rotation.
    Type: Grant
    Filed: January 19, 2000
    Date of Patent: November 20, 2001
    Assignee: The Charles Machine Works, Inc.
    Inventors: Arthur D. Deken, Cody L. Sewell
  • Patent number: RE37975
    Abstract: A directional boring machine equipped with a boring head comprising a blade assembly. The blade assembly may comprise a plurality of blades with deflecting surfaces. Alternately, the blade assembly has a single, stepped or serrated blade. The serrated blade assembly has a planar blade which is tapered in thickness and width from its base to its forward end. The forward end has teeth cut away on the backside to provide a recess or relief space for cuttings during the drilling process. A relief space or slot also is provided between the front two teeth for the same purpose. The blade is divided into two halves, and the halves are offset so that each of the teeth on each half provides a separate cutting point. The blade is angled in an upward direction relative to the base of the blade assembly to improve penetration and cutting actions. The blade assembly in combination with the boring head body provides exceptional cutting performance in a variety of soils and rock.
    Type: Grant
    Filed: September 25, 2000
    Date of Patent: February 4, 2003
    Assignee: The Charles Machine Works, Inc.
    Inventors: Brent G. Stephenson, Arthur D. Deken, Cody L. Sewell, Richard P. Dunn
  • Patent number: RE42445
    Abstract: An earth boring bit has cutting elements arranged to avoid tracking. The bit has a bit body having a bit axis of rotation. First, second and third cones are rotatably mounted to the bit body, each of the cones having a plurality of rows of cutting elements including a heel row and an adjacent row. The heel row of the first cone has at least equal the number of cutting elements as the heel rows of the other cones. The adjacent row of the second cone has at least 90 percent as many cutting elements as the heel row of the first cone. The heel row of the third cone has a pitch that is in the range from 20-50% greater than the heel rows of the first cone.
    Type: Grant
    Filed: June 4, 2010
    Date of Patent: June 14, 2011
    Assignee: Baker Hughes Incorporated
    Inventors: Floyd Felderhoff, Matthew R. Isbell, Rudolf C. Pessier