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    Cutting element with controlled superabrasive contact area and drill bits so equipped
    2.
    发明专利
    Cutting element with controlled superabrasive contact area and drill bits so equipped 未知

    公开(公告)号：GB2329405B

    公开(公告)日：2002-06-26

    申请号：GB9819098

    申请日：1998-09-03

    Applicant: BAKER HUGHES INC

    Inventor： SCOTT DANNY E ,  SMITH REDD H ,  HORTON RALPH M ,  CHAVES ARTHUR A

    IPC: E21B10/56 ,  E21B10/573

    Abstract: Cutting elements providing a relatively constant superabrasive area in contact with the formation responsive to weight on bit during a substantial portion of the useful life of a circular cutting face cutting element or other cutting element exhibiting a non-linear cutting edge, for example, from about 5% diametrical wear to in excess of about 30% diametrical wear in the case of a circular cutting element, measured across the cutting face. The superabrasive table of the cutting element is configured, internally, externally, or both, to vary in depth radially and laterally, as required, so that an increase in width of the contact or wear flat area with the formation and the variation in table depth as the cutting element wears, are substantially offsetting. The rate of penetration of a drill bit so equipped may thus be maintained at a desirable magnitude without a substantial increase in weight on bit as the cutting element wears, since the superabrasive contact area is maintained relatively constant.

    3.
    发明专利
    未知

    公开(公告)号：ITTO980801A1

    公开(公告)日：2000-03-22

    申请号：ITTO980801

    申请日：1998-09-22

    Applicant: BAKER HUGHES INC

    Inventor： SCOTT DANNY E ,  SMITH REDD H ,  HORTON RALPH M ,  CHAVES ARTUR A

    IPC: E21B10/56 ,  E21B10/573

    Abstract: Cutting elements providing a relatively constant superabrasive area in contact with the formation responsive to weight on bit during a substantial portion of the useful life of a circular cutting face cutting element or other cutting element exhibiting a non-linear cutting edge, for example, from about 5% diametrical wear to in excess of about 30% diametrical wear in the case of a circular cutting element, measured across the cutting face. The superabrasive table of the cutting element is configured, internally, externally, or both, to vary in depth radially and laterally, as required, so that an increase in width of the contact or wear flat area with the formation and the variation in table depth as the cutting element wears, are substantially offsetting. The rate of penetration of a drill bit so equipped may thus be maintained at a desirable magnitude without a substantial increase in weight on bit as the cutting element wears, since the superabrasive contact area is maintained relatively constant.

    Polycrystalline diamond cutters having modified residual stresses
    6.
    发明专利
    Polycrystalline diamond cutters having modified residual stresses 未知

    公开(公告)号：GB2384260A

    公开(公告)日：2003-07-23

    申请号：GB0306894

    申请日：1999-12-24

    Applicant: BAKER HUGHES INC

    Inventor： BUTCHER TRENT N ,  HORTON RALPH M ,  JUREWICZ STEPEN R ,  SCOTT DANNY E ,  SMITH REDD H

    IPC: B22F7/06 ,  E21B10/56 ,  E21B10/573

    Abstract: A method of forming a polycrystalline diamond compact cutter including a polycrystalline diamond table secured to a carbide substrate comprises: ```placing in a processing container an amount of diamond grains and carbide material to form a polycrystalline diamond table bonded to a carbide substrate; ```subjecting the diamond grains and carbide material in the processing container to a high- pressure, high-temperature sintering process, the process comprising: ```ramping up temperature and pressure over approximately a one-minute period; ```subjecting the diamond grains and carbide material to a pressure level of at least 60 Kb and a temperature of about 1450{C for a period of approximately eight minutes; ```ramping the temperature downwardly to at least a solidus temperature of the carbide material; ```maintaining a dwell period of about four minutes to about six minutes to anneal the diamond grains and carbide material into a sintered polycrystalline diamond compact; and ```ramping down the pressure and temperature over approximately a two-minute period; and ```bonding the sintered polycrystalline diamond compact to a carbide support to form a polycrystalline diamond compact cutter including a carbide substrate exhibiting at least a reduced level of residual tensile stress as compared to a carbide substrate of a conventional polycrystalline diamond compact cutter in an immediately post-fabricated state.

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