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    Cutting element for rock bit
    65.
    发明专利
    Cutting element for rock bit 未知

    公开(公告)号：GB2375364A

    公开(公告)日：2002-11-13

    申请号：GB0213827

    申请日：1999-02-12

    Applicant: SMITH INTERNATIONAL

    Inventor： ANDERSON NATHAN ROY ,  BELNAP DANIEL J ,  CAWTHORNE CHRIS E ,  EYRE RONALD K ,  KESHAVEN MADAPUSI K ,  NESE PER I ,  SIRACKI MICHAEL ALLEN ,  PORTWOOD GARY RAY

    IPC: E21B10/56 ,  E21B17/10 ,  E21B10/16

    Abstract: A culling element for a rock drilling bit comprises a cylindrical grip section (10, figure 1A) from which extends a protrusion 512 having a non-axisymmetric outer surface and a layer of ultra hard material 530 having a convex axisymmetric outer surface is formed over the protrusion. A critical contact region or zone 574, which is the portion of an insert closest to a hole wall while drilling and the region most liable to cracking due to stresses during drilling, is defined on the insert. Measured from a central axis (32, figure 1A) the critical zone is located not less than a first angle (72, figure 1A) of around 20{ and not greater than a second angle (73, figure 1A) of around 80{. Inside this region the ultra hard layer, generally polycrystalline diamond or polycrystalline cubic boron nitride, is thicker than outside to reduce cracking or delamination. One or more transition layers may be placed between the protrusion and the ultra hard layer.

    Cutting element for rock bit
    66.
    发明专利
    Cutting element for rock bit 未知

    公开(公告)号：GB2375127A

    公开(公告)日：2002-11-06

    申请号：GB0213834

    申请日：1999-02-12

    Applicant: SMITH INTERNATIONAL

    Inventor： ANDERSON NATHAN ROY ,  BELNAP JOHN DANIEL ,  CAWTHORNE CHRIS E ,  EYRE RONALD K ,  KESHAVEN MADAPUSI K ,  NESE PER I ,  SIRACKI MICHAEL ALLEN ,  PORTWOOD GARY RAY

    IPC: E21B10/56 ,  E21B17/10 ,  E21B10/16

    Abstract: A cutting element for a rock drilling bit comprises a cylindrical grip section (10, figure 1A) from which extends a protrusion 712 having an axisymmetric outer surface and a layer of ultra hard material 730 having a convex non-axisymmetric outer surface is formed over the protrusion. A critical contact region or zone 774, which is the portion of an insert closest to a hole wall while drilling and the region most liable to cracking due to stresses during drilling, is defined on the insert. Measured from a central axis (32, figure 1A) the critical zone is located not less than a first angle (72, figure 1A) of around 20{ and not greater than a second angle (73, figure 1A) of around 80{. Inside this region the ultra hard layer, generally polycrystalline diamond or polycrystalline cubic boron nitride, is thicker than outside to reduce cracking or delamination. One or more transition layers may be placed between the protrusion and the ultra hard layer.

    METHOD FOR SIMULATING DRILLING OF ROLLER CONE BITS AND ITS APPLICATION TO ROLLER CONE BIT DESIGN AND PERFORMANCE
    67.
    发明专利
    METHOD FOR SIMULATING DRILLING OF ROLLER CONE BITS AND ITS APPLICATION TO ROLLER CONE BIT DESIGN AND PERFORMANCE 未知

    公开(公告)号：CA2340547A1

    公开(公告)日：2001-09-13

    申请号：CA2340547

    申请日：2001-03-12

    Applicant: SMITH INTERNATIONAL

    Inventor： CAWTHORNE CHRIS E ,  HUANG SUJIAN

    IPC: E21B10/16 ,  E21B10/08 ,  E21B44/00

    Abstract: A method for simulating the drilling performance of a roller cone bit drilli ng an earth formation may be used to generate a visual representation of drilling, to design roller cone drill bits, and to optimize the drilling performance of a roller cone bit. The method for generating a visual representation of a roller cone bit drilling earth formations includes selecting bit design parameters, selecting drilling parameters, and selecting an earth formation to be drilled. The method further includes calculating, from the bit design parameters, drilling parameters and earth formation, parameters of a crater formed when one of a plurality of cutting elements contacts the earth formation. Th e method further includes calculating a bottomhole geometry, wherein the crater is removed from a bottomhole surface. The method also includes incrementally rotating the bit and repeating the calculating of crater parameters and bottomhole geometry based on calculated roller cane rotation speed and geometrical location with respect to rotation of said roller cone drill bit about its axis. The method also includes converti ng the crater and bottomhole geometry parameters into a visual representation.

    Drill bit
    70.
    发明专利
    Drill bit 未知

    公开(公告)号：GB2347701A

    公开(公告)日：2000-09-13

    申请号：GB0002397

    申请日：2000-02-02

    Applicant: SMITH INTERNATIONAL

    Inventor： CAWTHORNE CHRIS E ,  NGUYEN QUAN VAN ,  STRACKI MICHAEL A ,  PETERSON STEVEN W

    IPC: E21B10/22 ,  E21B10/25

    Abstract: A rolling cone drill bit has a bit body having at least one leg, including a journal segment and a shirttail 14. The shirttail 14 has a leg backface 18. A rolling cone cutter 20 has a cone backface 26. The leg backface 18 is canted relative to the cone bearing axis (angle alpha). A seal 40 is positioned in the interface between the leg backface 18 and the cone backface 26. In a further embodiment the seal 40 has an operating axis that is canted with respect to the bearing axis (angle beta).

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