Nonsymmetrical Bit Patents (Class 175/398)
  • Patent number: 9290994
    Abstract: A horizontal directional drilling sonde housing has a cavity for receiving a sonde. Signal channels extend from the cavity to an exterior of the housing. A polymer lines at least part of the cavity and fills the signal channels. The drilling tool has a bit body and a drilling body. The two bodies have respective lateral surfaces which engage each other to prevent the transverse movement of the drilling body relative to the bit body during operations. The drill bit has a forward extending drill tooth, which drill tooth is removable from a bore. A spacer is located in the bore between the bottom end of the bore and the tooth. The drilling bit has buttons located on the side in a spiral configuration about a longitudinal axis of the bit.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: March 22, 2016
    Inventor: Charles T. Webb
  • 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: 8960336
    Abstract: A rock drill bit having a shank fitted with a clamping end and a drilling tip located from the clamping end. The drilling tip has at least three blades and a central zone centered on a drill bit axis. The blades each include on a top side thereof a lip constituted by a leading chipping face and a trailing flank. The lips substantially converge onto each other within a the central zone of the drilling tip, wherein in the central zone, a long lip of the lips runs through the drill bit axis and has a commensurate overshoot segment extending beyond the drill bit axis.
    Type: Grant
    Filed: September 3, 2009
    Date of Patent: February 24, 2015
    Assignee: Heller Tools GmbH
    Inventors: Heinrich Kersten, Joerg Frommeyer, Sven Elmers, Hermann Albers, Ranier Lampe
  • Patent number: 8939237
    Abstract: A drilling apparatus is adapted for connection to a drill string such that the drill string rotates the drilling apparatus in a rotational cutting motion. The drilling apparatus includes a sonde housing having a distal end and a proximal end. The sonde housing includes a top platform positioned adjacent the distal end of the sonde housing and further includes a tongue positioned on the top platform. The drilling apparatus further includes a rotary cutting tool mounted to the distal end of the sonde housing.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: January 27, 2015
    Assignee: Vermeer Manufacturing Company
    Inventors: Randy R. Runquist, Keith A. Hoelting
  • Patent number: 8757298
    Abstract: A drilling unit for drilling a borehole and having an outer drill bit being rotationally driven by a primary rotary drive mechanism about a primary axis of rotation and having an outer bit cutting face disposed for drilling engagement with formation material. The outer drill bit defines an inner bit passage intersecting the outer bit cutting face. An inner drill bit is rotationally driven within the inner bit passage by a secondary rotary drive mechanism and has a secondary axis of rotation that can be the same or can be laterally offset from the primary axis of rotation. An inner bit cutting face is defined by the inner drill bit and is located within the inner bit passage. Rotation of the outer drill bit for borehole drilling causes orbital rotation of the inner drill bit about the primary axis of rotation simultaneously with rotation of the inner drill bit about the secondary axis of rotation for continuously cutting away formation material at the central region of the borehole being drilled.
    Type: Grant
    Filed: April 26, 2011
    Date of Patent: June 24, 2014
    Inventor: Edwin J. Broussard, Jr.
  • Patent number: 8720611
    Abstract: Downhole drilling tools designed and manufactured to reduce bit axial force and torque and to enhance drilling efficiency comprising laying out some cutters in one spiral direction of rotation about a bit rotational axis and other cutters in an opposite spiral direction of rotation; evaluating forces acting on cutters during simulated engagement with a downhole formation (straight and transitional drilling); and modifying cutter layout with respect to a spiral direction of rotation. Some embodiments further comprise, prior to simulation, placing cutters in cutter groups/sets at respective locations to obtain a level of force balance. Multilevel force balanced downhole drilling tools may be designed using five respective simulations: cutter group level, neighbor cutter group level, cutter set level, group of N (N=3 or N=4) consecutive cutters level and all cutters level. Cutter layout procedures and algorithms to minimize respective bit forces and in some embodiments to obtain force balance are described.
    Type: Grant
    Filed: December 15, 2010
    Date of Patent: May 13, 2014
    Assignee: Halliburton Energy Services, Inc.
    Inventor: Shilin Chen
  • Publication number: 20140048337
    Abstract: According to the invention, a method for designing a rotary drill bit for drilling a cavity in a medium is disclosed. The method may include determining a characteristic of a drillstring with which the rotary drill bit is coupled. The method may also include determining an initial number of groups of cutters for the rotary drill bit, where each group of cutters includes a plurality of cutters substantially aligned along a different radius of the drilling face. The method may moreover include determining a characteristic of the medium relative to a characteristic of the cutters. The method may additionally include determining a characteristic of a rotational motion source used to rotate the rotary drill bit. The method may further include determining the angles of pitch between each of the groups of cutters to minimize an amount of sticking or slipping of the bit in the medium during a drilling operation.
    Type: Application
    Filed: October 25, 2013
    Publication date: February 20, 2014
    Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventor: JAHIR PABON
  • Publication number: 20140034395
    Abstract: A drill head is provided with three main cutting edges each having a straight direction of extension with a predominant radial direction component. The directions of extension limit two adjacent main bore dust discharge sectors, each spanning a main sector angle. Three drill head cutting legs each forming a main cutting edge where the three main cutting edges have different lengths along their directions of extension. Concentric ring shaped removal areas overlap at least partially such that a triple removal area coverage is provided in an outer ring zone and a double removal area coverage is provided in an inner ring zone.
    Type: Application
    Filed: August 1, 2013
    Publication date: February 6, 2014
    Inventors: Rainer EGGERS, Florian PROBST, Walter HULM, Manfred GEIER
  • Patent number: 8631883
    Abstract: A sectorial force balanced drill bit, including conventional and bi-center drill bits, having the true center of rotation the same as, or about the same as, the bit mass axis. The bit mass axis is a longitudinal axis located off-center to the geometric axis of the bit and comprises the center of mass point. Additionally, a method for sectorially force balancing drill bits is provided. The method includes dividing the drill bit into one or more sections, calculating the magnitude and direction of the resultant radial imbalance force for the cutters of each section, adjusting the cutters and/or blades until the magnitude of the resultant radial imbalance force is about the same for each section and the direction of the resultant radial imbalance force for each section is about 2?/n, where n is the number of sections, from the adjacent section.
    Type: Grant
    Filed: March 6, 2009
    Date of Patent: January 21, 2014
    Assignee: Varel International Ind., L.P.
    Inventor: Alfazazi Dourfaye
  • Patent number: 8561729
    Abstract: A casing end tool has a bowl-like (or cup-like) body defined by a wall having an outer convex surface and an inner concave surface opposite of the outer convex surface. The bowl-like body has a center axis. The inner concave surface is non-axisymmetric with respect to the center axis, while the outer convex surface is axisymmetric with respect to the center axis. The non-axisymmetric configuration is provided in one implementation through the presence of a set of raised boss or land structures formed on the inner concave surface. In another implementation, the non-axisymmetric configuration is provided by channels formed in the inner concave surface.
    Type: Grant
    Filed: June 3, 2010
    Date of Patent: October 22, 2013
    Assignee: Varel International, Ind., L.P.
    Inventors: William W. King, Michael Reese, Steven W. Drews, Ian Alastair Kirk
  • Patent number: 8544569
    Abstract: An offset rock bit (12) has a steering face (28) and a shoe (30) provided by a recess formed into the steering face (28). A slot (66) formed into the shoe (30) for receiving a pull back adapter (50) in a centrally located position in the forward end of the offset rock bit (12). The pull back 5 adapter (50) has a pull back eye (52) with a central axis (62) which is aligned with a centrally disposed longitudinal axis (20) of the offset rock bit (12) and the tool string (10). This aligns the pull back eye (52) of the pull back adapter (50) with a borehole formed using the offset rock bit (12). The pull back adapter (50) also includes side edges (54, 56) which are configured for centering the pull back adapter (50) and pull back conduit within the borehole.
    Type: Grant
    Filed: February 22, 2012
    Date of Patent: October 1, 2013
    Assignee: Radius HDD Direct, LLC
    Inventors: Ronald F. Wright, David G. Bullock
  • 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: 8210286
    Abstract: A drill bit includes a plurality of continuous segments impregnated with diamond that are each mounted to form a corresponding blade. The regions between the blades define a plurality of fluid passages on the bit face. The blades extend radially outwardly to the gage. The continuous segments may be either straight or spiral in design. Furthermore, the design of the segments supports varying one or more of: diamond content, width, back rake angle and/or relief angle along a length of the segment.
    Type: Grant
    Filed: May 2, 2011
    Date of Patent: July 3, 2012
    Assignee: Varel International, Ind., L.P.
    Inventors: Alfazazi Dourfaye, Michel De Reynal
  • Publication number: 20120152621
    Abstract: An offset rock bit (12) has a steering face (28) and a shoe (30) provided by a recess formed into the steering face (28). A slot (66) formed into the shoe (30) for receiving a pull back adapter (50) in a centrally located position in the forward end of the offset rock bit (12). The pull back 5 adapter (50) has a pull back eye (52) with a central axis (62) which is aligned with a centrally disposed longitudinal axis (20) of the offset rock bit (12) and the tool string (10). This aligns the pull back eye (52) of the pull back adapter (50) with a borehole formed using the offset rock bit (12). The pull back adapter (50) also includes side edges (54, 56) which are configured for centering the pull back adapter (50) and pull back conduit within the borehole.
    Type: Application
    Filed: February 22, 2012
    Publication date: June 21, 2012
    Applicant: Radius HDD Direct, LLC
    Inventors: Ronald F. Wright, JR., David G. Bullock
  • Patent number: 8196683
    Abstract: A drill bit includes a plurality of continuous segments impregnated with diamond that are each mounted to form a corresponding blade. The regions between the blades define a plurality of fluid passages on the bit face. The blades extend radially outwardly to the gage. The continuous segments may be either straight or spiral in design. Furthermore, the design of the segments supports varying one or more of: diamond content, width, back rake angle and/or relief angle along a length of the segment.
    Type: Grant
    Filed: July 26, 2011
    Date of Patent: June 12, 2012
    Assignee: Varel International, Ind., L.P.
    Inventors: Alfazazi Dourfaye, Michel de Reynal
  • Patent number: 8122979
    Abstract: An offset rock bit (12) has a steering face (28) and a shoe (30) provided by a recess formed into the steering face (28). A slot (66) formed into the shoe (30) for receiving a pull back adapter (50) in a centrally located position in the forward end of the offset rock bit (12). The pull back adapter (50) has a pull back eye (52) with a central axis (62) which is aligned with a centrally disposed longitudinal axis (20) of the offset rock bit (12) and the tool string (10). This aligns the pull back eye (52) of the pull back adapter (50) with a borehole formed using the offset rock bit (12). The pull back adapter (50) also includes side edges (54, 56) which are configured for centering the pull back adapter (50) and pull back conduit within the borehole.
    Type: Grant
    Filed: December 18, 2009
    Date of Patent: February 28, 2012
    Assignee: Radius HDD Direct, LLC
    Inventors: Ronald F. Wright, Jr., David G. Bullock
  • Publication number: 20110315455
    Abstract: Cutting elements for downhole cutting tools comprise a top surface having a cutting surface portion and a cutting profile asymmetrically disposed across the top surface. The cutting elements comprise first and second longitudinal side surfaces and first and second lateral side surfaces, each having a respective cross-section. The cross-section of one of the longitudinal side surfaces can have one beveled portion and the cross-sections of the other longitudinal side surface and the first and second lateral side surfaces can have two beveled portions. A cutting end of a downhole cutting tool comprises two cutting elements disposed facing each another with a portion of the cutting surface portion of a first cutting element being disposed opposite the cutting profile of the second cutting element and the cutting surface portion of the second cutting element being disposed opposite the cutting profile of the first cutting element.
    Type: Application
    Filed: June 24, 2010
    Publication date: December 29, 2011
    Inventors: Calvin J. Stowe, II, Andrew D. Ponder
  • Publication number: 20110315448
    Abstract: Cutting elements for downhole cutting tools comprise a top surface having a cutting surface portion and a cutting profile disposed across the top surface. The cutting elements comprise first and second longitudinal side surfaces and first and second lateral side surfaces, each having a respective cross-section. The cutting profile can be disposed on the cutting surface either asymmetrically or symmetrically. Asymmetrical disposition permits two cutting elements to be arranged facing each other to cover a center point of a cutting tool. The cutting edge of asymmetrical or symmetrically disposed cutting profiles can have a shape that facilitates self-sharpening during cutting.
    Type: Application
    Filed: March 24, 2011
    Publication date: December 29, 2011
    Inventors: Calvin J. Stowe II, Andrew D. Ponder
  • 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: 8042625
    Abstract: A drilling tool has a body with a main drilling region and a pilot drilling region, eccentric to the main drilling region. The main drilling region has main blades and the pilot drilling region has pilot blades. The main drilling region has a main pass-through diameter, centered upon a first axis, one of the main blades extending to the main pass-through diameter, the pilot region having a pilot gauge diameter, centered upon a second axis of rotation at least one of the pilot blades extending to the pilot gauge diameter, wherein part of a circle of diameter equal to the pilot gauge diameter and centered upon the second axis of rotation extends outside of a circle of diameter equal to the main pass-through diameter and centered upon the first axis.
    Type: Grant
    Filed: November 2, 2009
    Date of Patent: October 25, 2011
    Assignee: National Oilwell Varco, L.P.
    Inventors: Ridha Chafai, James Edward Wallace
  • Publication number: 20110203854
    Abstract: A drill bit includes a plurality of continuous segments impregnated with diamond that are each mounted to form a corresponding blade. The regions between the blades define a plurality of fluid passages on the bit face. The blades extend radially outwardly to the gage. The continuous segments may be either straight or spiral in design. Furthermore, the design of the segments supports varying one or more of: diamond content, width, back rake angle and/or relief angle along a length of the segment.
    Type: Application
    Filed: May 2, 2011
    Publication date: August 25, 2011
    Applicant: Varel International, Ind., L.P.
    Inventors: Alfazazi Dourfaye, Michel de Reynal
  • Patent number: 7958953
    Abstract: A bi-center drilling tool comprises a main reamer region located eccentrically to an axis of rotation of the tool, and a leading cutting structure located ahead of the main reamer region, in the drilling direction. The leading cutting structure is located so as to apply a side loading to the drilling tool. The side loading is in direction to counter the loading which, in use, is due to the main reamer region being eccentric to the axis of rotation.
    Type: Grant
    Filed: October 6, 2009
    Date of Patent: June 14, 2011
    Assignee: National Oilwell Varco, L.P.
    Inventor: Ridha Chafai
  • Patent number: 7958940
    Abstract: A process is provided to drill through a composite frac plug. The plug is in an oil well. The process utilizes an improved mill. The process also rotates drill pipe at one hundred to five hundred rpm and circulates drilling fluid such that the velocity of the fluid upwardly over the exterior of the drill pipe is in the range of three hundred to four hundred and seventy-five feet per minute. One thousand to three thousand pounds of slack off weight is applied during the process.
    Type: Grant
    Filed: March 31, 2009
    Date of Patent: June 14, 2011
    Inventor: Steve D. Jameson
  • Patent number: 7950476
    Abstract: A rolling cone drill bit includes a cutter element having a cutting portion with a chisel crest and a pilot portion extending beyond the chisel crest. The pilot portion includes a cutting surface that may be generally conical, or form a second chisel crest. The cutting tip of the pilot portion is supported by buttress portions which emerge from and extend beyond the flanks of the chisel crest to provide additional strength and support for the material of the pilot portion that extends beyond the height of the chisel crest.
    Type: Grant
    Filed: November 16, 2009
    Date of Patent: May 31, 2011
    Assignee: Smith International, Inc.
    Inventors: Scott D. McDonough, Amardeep Singh
  • Patent number: 7891444
    Abstract: A drill bit comprises a plurality of cutting blades arranged circumferentially, the cutting blades having a cutting edge formed by a connecting ridge line between a cutting face and a flank; and a tip formed by coupling radially inner ends of the cutting edges to each other at a center portion of a bit tip end, wherein at least one of the cutting blades has a first flank and a second flank, wherein the first flank has a blade tip side flank close to the cutting edge and a base end side flank formed on the base end side of the blade tip side flank, and wherein a tilt angle ?1 of the blade tip side flank 3a is smaller than a tilt angle ?2 of the base end side flank 3b which is tilted toward the axial direction.
    Type: Grant
    Filed: March 7, 2005
    Date of Patent: February 22, 2011
    Assignee: Kabushiki Kaisha Miyanaga
    Inventor: Masaaki Miyanaga
  • Patent number: 7836980
    Abstract: Methods of forming cutting element pockets in blades of earth-boring tools include forming a first recess and a second recess intersecting at a location defining the a back of the pocket using a cutter oriented in a manner so as to avoid tool path interference with adjacent blades. A filler material is disposed in the second recess to the location of the back of the pocket. Earth-boring tools including such cutting element pockets.
    Type: Grant
    Filed: August 13, 2007
    Date of Patent: November 23, 2010
    Assignee: Baker Hughes Incorporated
    Inventors: John H. Stevens, Nicholas J. Lyons
  • Patent number: 7766103
    Abstract: A drill bit and a single pass drilling apparatus are disclosed. The one-piece drill bit is rotatable about a drilling axis and has a connection portion, adapted to be rigidly connected to a drill steel, a pilot part and a reamer part. The reamer part has a leading and at least one trailing first rock machining means disposed on one side of the pilot part within a sector defined by sector angle ?. At least one of the trailing first rock machining means is axially spaced from the leading first rock machining means in the direction toward the trailing end of the drill bit.
    Type: Grant
    Filed: February 13, 2008
    Date of Patent: August 3, 2010
    Assignee: Sandvik Intellectual Property AB
    Inventor: Pierre Ravat
  • Patent number: 7694755
    Abstract: An earth boring drill bit design for alleviating balling varies the junk slot depth in junk slots subject to balling from the other junk slots. Using variable depth bit bodies enhances the hydraulic characteristics of the bit as well as assists in the placement of the nozzles for machining purposes. This flexibility optimizes the area changes along the ducts required by the bit's operation.
    Type: Grant
    Filed: October 15, 2007
    Date of Patent: April 13, 2010
    Assignee: Baker Hughes Incorporated
    Inventors: Timothy King Marvel, William Henry Sherwood, Jr., David A. Trivas, Michael R. Wells
  • Patent number: 7631709
    Abstract: A rolling cone drill bit includes a cutter element having a cutting portion with a chisel crest and a pilot portion extending beyond the chisel crest. The pilot portion includes a cutting surface that may be generally conical, or form a second chisel crest. The cutting tip of the pilot portion is supported by buttress portions which emerge from and extend beyond the flanks of the chisel crest to provide additional strength and support for the material of the pilot portion that extends beyond the height of the chisel crest.
    Type: Grant
    Filed: January 3, 2007
    Date of Patent: December 15, 2009
    Assignee: Smith International, Inc.
    Inventors: Scott D. McDonough, Amardeep Singh
  • 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: 20090200081
    Abstract: A shear cutter drill bit for drilling a subterranean formation is provided having a bit body; a bit face on the bit body having at least a center zone, an efficiency zone, and an outer zone, the efficiency zone being located between the center zone and the outer zone; and a plurality of cutters having a backrake angle located on the bit face; wherein a majority of the cutters located in the efficiency zone of the bit face have a more aggressive backrake angle than a majority of the cutters located in the center zone of the bit face and a majority of the cutter located in the outer zone of the bit face.
    Type: Application
    Filed: February 8, 2008
    Publication date: August 13, 2009
    Applicant: X-TREME BITS & DOWNHOLE TOOLING LTD.
    Inventors: Timothy P. Beaton, John James Herman
  • Patent number: 7559379
    Abstract: In one aspect of the present invention, a drill string has a drill bit with a body intermediate a shank and a working face. The working face has at least one cutting element. A jack element is disposed within the drill bit body and has a distal end substantially protruding from the working face. The distal end has a primary deflecting surface having an angle relative to a central axis of the jack element of 15 to 75 degrees.
    Type: Grant
    Filed: August 10, 2007
    Date of Patent: July 14, 2009
    Inventors: David R. Hall, David Lundgreen, Daryl Wise
  • 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: 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
  • Publication number: 20090138242
    Abstract: According to the invention, a method for designing a rotary drill bit for drilling a cavity in a medium is disclosed. The method may include determining a characteristic of a drillstring with which the rotary drill bit is coupled. The method may also include determining an initial number of groups of cutters for the rotary drill bit, where each group of cutters includes a plurality of cutters substantially aligned along a different radius of the drilling face. The method may moreover include determining a characteristic of the medium relative to a characteristic of the cutters. The method may additionally include determining a characteristic of a rotational motion source used to rotate the rotary drill bit. The method may further include determining the angles of pitch between each of the groups of cutters to minimize an amount of sticking or slipping of the bit in the medium during a drilling operation.
    Type: Application
    Filed: November 27, 2007
    Publication date: May 28, 2009
    Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventor: Jahir A. Pabon
  • Publication number: 20090107732
    Abstract: 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 plurality of fluid passages on the bit face. One or more of the cutting structures may include outermost ends that exhibit a cross-sectional geometry that is elongated in a direction along a defined axis. The cutting structures may be oriented such that the defined axis is neither coplanar with, nor parallel to, an intended rotational path of the at least one discrete cutting structure during operation of the bit. In one embodiment, the cutting structure is oriented such that the defined axis is at an acute angle relative to a tangent of the intended rotational path for the associated cutting structure. Other or different features may include, for example, additional, differently configured cutting elements.
    Type: Application
    Filed: October 31, 2007
    Publication date: April 30, 2009
    Inventors: Eric E. McClain, Marcus R. Skeem
  • Patent number: 7513319
    Abstract: A drill steel includes a drill bit and a reamer bit. The drill steel rotates the drill bit to form a hole in a work surface and drives forward to insert the reamer bit into the hole. The reamer bit includes a plurality of inserts positioned on a cylindrical drilling surface to ream out the hole by carving channels in the hole interior surface. The inserts include cutting elements that have radiused or arcuate edges.
    Type: Grant
    Filed: June 11, 2007
    Date of Patent: April 7, 2009
    Inventor: Donald L. DeVall
  • Publication number: 20090044663
    Abstract: Methods of forming cutting element pockets in blades of earth-boring tools include forming a first recess and a second recess intersecting at a location defining the a back of the pocket using a cutter oriented in a manner so as to avoid tool path interference with adjacent blades. A filler material is disposed in the second recess to the location of the back of the pocket. Earth-boring tools having such cutting element pockets are also disclosed.
    Type: Application
    Filed: August 13, 2007
    Publication date: February 19, 2009
    Inventors: John H. Stevens, Nicholas J. Lyons
  • Publication number: 20070278014
    Abstract: Disclosed within is a drill bit with a plural set of blades having redundant cutter elements and single sets of blades having unique cutter element arrangements. The redundant cutter elements have equivalent longitudinal and axial spacing as corresponding cutter elements. The distance from a longitudinal axis of the bit to a redundant cutter element is equivalent to the distance from the longitudinal axis to the corresponding cutter element.
    Type: Application
    Filed: May 30, 2006
    Publication date: December 6, 2007
    Applicant: Smith International, Inc.
    Inventor: Peter T. Cariveau
  • Patent number: 7228922
    Abstract: A drill bit has a pair of cutting teeth with cutting elements extending from a cutting end portion of the drill bit. Each cutting tooth extends radially, outwardly parallel to a longitudinal axis of the drill steel. The cutting teeth are juxtaposed with one another on the longitudinal axis. Each cutting tooth includes a plurality of raised cutting elements connected to a plurality of lowered edge portions. The cutting elements produce concentric circular channels in the working surface of a rock formation, as the drill bit rotates during the cutting operation. The drill bit also includes a pocket for accumulating and removing dislodged material during the cutting operation.
    Type: Grant
    Filed: June 8, 2004
    Date of Patent: June 12, 2007
    Inventor: Donald L. DeVall
  • Patent number: 7137462
    Abstract: A drill bit constructed to improve a tip end of the cutting pointed portion to efficiently discharge chips from a center portion of a crush face of a drill hole to thereby improve cutting efficiency, is disclosed. A plurality of cutting blades 3a, 3b, and 3c are formed to be arranged in a circumferential direction of a cutting blade chip 3 formed by a cemented carbide block body. The cutting blades 3a, 3b, and 3c are each structured to have a cutting edge 4 formed by an edge between a face 6 and a flank 7 of the associated cutting blades. In this drill bit, a groove 8 is configured to be provided in a center portion of the tip end of the cutting blade chip in contact with tip ends of the cutting blade chip, and the tip ends of the cutting edges 4 have pointed portions.
    Type: Grant
    Filed: October 31, 2003
    Date of Patent: November 21, 2006
    Assignee: Kabushiki Kaisha Miyanaga
    Inventor: Masaaki Miyanaga
  • Patent number: 7086489
    Abstract: Disclosed are cutter elements for a drill bits having particular, but not exclusive, application on the nose portion of the cone cutters of a rolling cone bit. The cutter elements include a base, a cutting portion, and a plurality of cutting lobes extending radially from the cutting portion. Each lobe includes a forward-facing cutting face and trailing portion having a trailing surface that intersects the cutting face in a nonlinear cutting edge. The trailing surface is non-planar and recedes away from the cutting edge. In certain embodiments, the trailing surface is a partial dome shaped surface. The trailing portion provides strength and buttresses the cutting edge.
    Type: Grant
    Filed: April 25, 2005
    Date of Patent: August 8, 2006
    Assignee: Smith International, Inc.
    Inventor: Scott McDonough
  • Patent number: 7036609
    Abstract: A sonde (transmitter) housing having a one-piece design for improved housing rigidity. The housing includes a mechanically-adjustable mounting configuration adaptable to a variety of sonde applications. A method of making the sonde housing in a one-piece design and infinitely orienting the sonde clocking electronics.
    Type: Grant
    Filed: January 14, 2002
    Date of Patent: May 2, 2006
    Assignee: Vermeer Manufacturing Company
    Inventors: Tod Michael, Ric Smith, Mark Facile
  • Patent number: 6913098
    Abstract: An improved bi-center with improved directional stability and wear resistance is disclosed, said bit optimally utilizing a plurality of shaped PDC cutting elements selectively situated about the cutting surfaces of the pilot and the reamer to produce a minimal force imbalance, where further said pilot bit and the reamer are force balanced to further reduce imbalance in the operation of the tool.
    Type: Grant
    Filed: November 21, 2002
    Date of Patent: July 5, 2005
    Assignee: ReedEycalog, L.P.
    Inventors: Coy M. Fielder, Rogerio H. Silva
  • Publication number: 20040222024
    Abstract: An apparatus for the directional drilling of a bore hole through a solid substrate includes a main bore head mounted for rotation on a flexible drive shaft and a pilot bore head for weakening a region of substrate in advance of the main bore head, the weakened region being eccentrically located relative to the main bore head. The apparatus further incudes means for enabling the drilling access of the main bore head, during subsequent drilling of the bore hole, to become substantially aligned with the weakened region of substrate.
    Type: Application
    Filed: June 10, 2004
    Publication date: November 11, 2004
    Inventor: William George Edscer
  • Publication number: 20040188149
    Abstract: A drill out bi-center bit and a method for using the same are provided that offer the ability to drill out cement and casing shoes, and increased stability. The bi-center bit includes a bit body having a first end operable to be coupled with a drill string, a second end including a pilot section, and an eccentric reamer section intermediate the first and second ends. A first plurality of cutter assemblies is disposed upon the exterior surface of the pilot section, while a second plurality of cutter assemblies is disposed upon the reamer section. A plurality of recessed cutter assemblies is also disposed upon the pilot section, such that the recessed cutter assemblies are located within a radius beginning at a central axis of the pilot section and terminating at a central axis of the reamer section and are recessed with respect to a lower surface of the pilot.
    Type: Application
    Filed: March 26, 2003
    Publication date: September 30, 2004
    Inventors: Gary M. Thigpen, Carl W. Keith
  • Patent number: 6789635
    Abstract: A drill bit configured for use in horizontal directional boring includes a spoon-shaped body with a rearwardly angled or inclined arcuate front end face that widens from a leading edge to a trailing edge in a circumferential direction, the front face sloping rearwardly from a leading side surface to a trailing edge in a circumferential direction, the leading and trailing side surfaces extending rearwardly in from the front end face. The leading side surface is wider than the trailing side surface. In one configuration, the front end surface and leading side face are each provided with a plurality of carbide inserts or studs which may be arranged in a row.
    Type: Grant
    Filed: June 18, 2002
    Date of Patent: September 14, 2004
    Assignee: Earth Tool Company, L.L.C.
    Inventors: Steven W. Wentworth, Robert F. Crane, Douglas B. Caraway
  • Publication number: 20040099442
    Abstract: The invention relates to a method for opening rock with a chisel, especially for producing a drillhole in rock by means of a drilling device that comprises a percussion drive and a rotating thrust rod assembly. The percussion unit, via the drill head, exerts a thrust impulse on the breast in a segment thereof in order to knock out rock from the breast. In a subsequent step, the percussion unit is rotated by an angle &agr; via the rod assembly. Pieces of rock are knocked out from the breast by exerting thrust impulses via the drill head and the drill tip in the corresponding new segment of the breast.
    Type: Application
    Filed: October 28, 2003
    Publication date: May 27, 2004
    Inventor: Franz-Josef Puttman
  • Publication number: 20040099448
    Abstract: An improved bi-center with improved directional stability and wear resistance is disclosed, said bit optimally utilizing a plurality of shaped PDC cutting elements selectively situated about the cutting surfaces of the pilot and the reamer to produce a minimal force imbalance, where further said pilot bit and the reamer are force balanced to further reduce imbalance in the operation of the tool.
    Type: Application
    Filed: November 21, 2002
    Publication date: May 27, 2004
    Inventors: Coy M. Fielder, Rogerio H. Silva
  • Publication number: 20040079554
    Abstract: A cup-shaped drill head with an inner conical surface (2) for force-locking connection with an exterior conical surface (3) of a driving drill shaft (4), which at the leading end changes over into a cup base (5) with a center point (P), whereby in the change over from the cup base (5) to the inner conical surface (2) a lesser curvature (K) is present than at the center point (P).
    Type: Application
    Filed: October 15, 2003
    Publication date: April 29, 2004
    Inventors: Udo Hauptmann, Peter Sternberger, Reinhard Schulz, Martin Richter