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    Matrix body fixed cutter bits
    12.
    发明专利
    Matrix body fixed cutter bits 未知

    公开(公告)号：GB2480207B

    公开(公告)日：2013-05-22

    申请号：GB201115383

    申请日：2010-02-18

    Applicant: SMITH INTERNATIONAL

    Inventor： LOCKWOOD GREGORY T ,  ZHANG YOUHE

    IPC: E21B10/00 ,  E21B10/42

    Abstract: A drill bit that includes a bit body having a plurality of blades extending radially therefrom, at least a portion of the plurality of blades comprises a first matrix region comprising a plurality of first carbide particles separated by a first binder phase, each of the first carbide particles comprising a mixture of WC and W2C, and wherein the first matrix region has less than about 5 percent by volume, based on the total volume of the first matrix region, of complex metal carbides dispersed in the first binder phase; and at least one cutting element for engaging a formation disposed on at least one of the plurality of blades.

    HIGH-STRENGTH, HIGH-TOUGHNESS MATRIX BIT BODIES
    14.
    发明专利
    HIGH-STRENGTH, HIGH-TOUGHNESS MATRIX BIT BODIES 未知

    公开(公告)号：CA2576072C

    公开(公告)日：2010-03-30

    申请号：CA2576072

    申请日：2007-01-29

    Applicant: SMITH INTERNATIONAL

    Inventor： LIANG DAH-BEN ,  GRIFFO ANTHONY ,  OLDHAM THOMAS W ,  LOCKWOOD GREGORY T

    IPC: E21B10/46 ,  B23B51/00

    Abstract: A drill bit that includes a bit body formed from a matrix powder and at least one cutting element for engaging a formation, wherein the matrix powder included (a) stoichiometric tungsten carbide particles, (b) cemented tungsten carbide particles, and (c) cast tungsten carbide particles, and wherein after formation with the matrix powder, the bit has an erosion rate of less than 0.001 in/hr, a toughness of greater than 20 ksi(in0.5), and a transverse rupture strength of greater than 140 ksi is disclosed.

    Matrix powder for drill bit body
    15.
    发明专利
    Matrix powder for drill bit body 未知

    公开(公告)号：GB2459198A

    公开(公告)日：2009-10-21

    申请号：GB0906694

    申请日：2009-04-17

    Applicant: SMITH INTERNATIONAL

    Inventor： SHENG XIAYANG ,  LOCKSTEDT ALAN W ,  LOCKWOOD GREGORY T

    IPC: B22F7/06 ,  C01B32/949 ,  C22C1/05 ,  C22C29/02 ,  E21B10/00

    Abstract: A matrix powder for forming a matrix drill bit body comprises a plurality of carbide particles having a particle size distribution of ∓20% or less of a median particle size and a plurality of metal binder particles. The metal binder may comprise 8 to 12 weight % of the matrix powder. Optionally, the carbide may be one of cast tungsten carbide, cemented tungsten carbide or macrocrystalline tungsten carbide. Preferably, the mean particle size of the carbide particles ranges from 50 to 840 microns. A drill bit comprises a bit body having a plurality of blades 10, at least a portion of the plurality of blades comprises a first matrix region (10a, Fig. 1b), wherein the first matrix region comprises a plurality of carbide particles, of narrow size distribution, separated by a binder phase. The carbide particles have a mean free path of at least 40 microns.

    16.
    发明专利
    未知

    公开(公告)号：DE602006003272D1

    公开(公告)日：2008-12-04

    申请号：DE602006003272

    申请日：2006-06-30

    Applicant: SMITH INTERNATIONAL

    Inventor： VISWANADHAM RAMAMURTHY ,  LIANG DAH-BEN ,  LOCKWOOD GREGORY T

    IPC: C23C8/04 ,  E21B10/56

    Abstract: A cutting tool (26) that includes at least one tungsten carbide cutting element (28) disposed on a support, wherein at least one tungsten carbide cutting element has at least one localized region (74,76,78) having a material property different from the remaining region, wherein the at least one localized region having a different material property is prepared by a method including determining at least one localized region needing a variation in a material property different from the remaining region; coating a portion of a surface of the at least one tungsten carbide cutting element with a refractory material such that a surface corresponding to the localized region is left uncoated; and treating the coated cutting element with a selected agent to diffuse the selected agent into the localized region is disclosed.

    IMPREGNATED DIAMOND CUTTING STRUCTURES
    20.
    发明专利
    IMPREGNATED DIAMOND CUTTING STRUCTURES 未知

    公开(公告)号：CA2519495A1

    公开(公告)日：2006-04-18

    申请号：CA2519495

    申请日：2005-09-13

    Applicant: SMITH INTERNATIONAL

    Inventor： LOCKWOOD GREGORY T

    IPC: E21B10/46 ,  B21K5/02 ,  B23P15/28 ,  C22C26/00

    Abstract: An insert for a drill bit that includes diamond particles disposed in a matr ix material, wherein the diamond particles have a contiguity of 15% or less is disclosed. A method of forming a diamond-impregnated cutting structure, that includes loading a plurality of substantially uniformly coated diamond particles into a mold cavity, pre-compacting the substantially uniformly coated diamon d particles using a cold-press cycle, and heating the compacted, substantially uniformly coated diamond particles with a matrix material to form the diamon d impregnated cutting structure is also disclosed.

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