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    Diamond bit steel body cutter pocket protection
    43.
    发明专利
    Diamond bit steel body cutter pocket protection 未知

    公开(公告)号：GB2441859A

    公开(公告)日：2008-03-19

    申请号：GB0716777

    申请日：2007-08-29

    Applicant: SMITH INTERNATIONAL

    Inventor： LOCKSTEDT ALAN W ,  OLDHAM THOMAS W

    IPC: E21B10/54 ,  E21B10/46

    Abstract: A drill bit having increased resistance to erosion and hence increased resistance to failure has erosion resistant material in the area surrounding cutter pockets. The drill bit includes a steel bit body having blades (304, figure3), cutter pockets 308 with cutters 310 disposed on the blades and recesses 312 formed in the surface of the cutter pockets. Erosion resistant 316 material is disposed within the recesses.

    Drill bit with cutter pockets formed by plunge EDM
    44.
    发明专利
    Drill bit with cutter pockets formed by plunge EDM 未知

    公开(公告)号：GB2438840A

    公开(公告)日：2007-12-12

    申请号：GB0700400

    申请日：2007-01-09

    Applicant: SMITH INTERNATIONAL

    Inventor： OLDHAM THOMAS W

    IPC: E21B10/00

    Abstract: The disclosure provides an improved method for manufacturing a drill bit. The method includes applying a hardfacing material to the drill bit, forming a cutter pocket within the drill bit with plunge EDM, and inserting a cutting element into the cutter pocket.

    Thermally stable diamond polycrystalline diamond constructions
    47.
    发明专利
    Thermally stable diamond polycrystalline diamond constructions 未知

    公开(公告)号：ZA200507649B

    公开(公告)日：2006-09-27

    申请号：ZA200507649

    申请日：2005-09-21

    Applicant: SMITH INTERNATIONAL

    Inventor： EYRE RONALD K ,  GRIFFO ANTHONY ,  OLDHAM THOMAS W

    IPC: B32B20060101 ,  E21B20060101

    Abstract: Thermally stable diamond constructions comprise a diamond body having a plurality of bonded diamond crystals and a plurality of interstitial regions disposed among the crystals. A metallic substrate is attached to the diamond body. A working surface is positioned along an outside portion of the diamond body, and the diamond body comprises a first region that is substantially free of a catalyst material, and a second region that includes the catalyst material. The diamond body first region extends from the working surface to depth of at least about 0.02 mm to a depth of less than about 0.09 mm. The diamond body includes diamond crystals having an average diamond grain size of greater than about 0.02 mm, and comprises at least 85 percent by volume diamond based on the total volume of the diamond body.

    FIXED CUTTER DRILL BIT FOR ABRASIVE APPLICATIONS
    48.
    发明专利
    FIXED CUTTER DRILL BIT FOR ABRASIVE APPLICATIONS 未知

    公开(公告)号：CA2786820A1

    公开(公告)日：2006-09-03

    申请号：CA2786820

    申请日：2006-03-03

    Applicant: SMITH INTERNATIONAL

    Inventor： ISNOR SIDNEY J ,  AZAR MICHAEL G ,  HOFFMASTER CARL ,  ALSUP SHELTON W ,  OLDHAM THOMAS W ,  OLIVER STUART R

    IPC: E21B10/46

    Abstract: The invention provides a fixed cutter drill bit for drilling through unconsolidated, highly abrasive formations. The bit includes a bit body having a cutting face and a side portion. The bit body comprising carbide matrix material. A plurality of blades azimuthally spaced about the cutting face and a plurality of cutters disposed along the blades. At least one gage pad is disposed along a side of the bit body and includes wear resistant gage elements formed of a material more wear resistant than the matrix material forming a portion of the gage pad. The wear resistant elements have a rounded surface and are embedded in gage pad material proximal a leading edge of the gage pad to provide a rounded wear-resistant edge or surface proximal the leading edge.

    COMPOSITE NOZZLES FOR ROCK BITS
    49.
    发明专利
    COMPOSITE NOZZLES FOR ROCK BITS 未知

    公开(公告)号：CA2159796C

    公开(公告)日：2006-04-11

    申请号：CA2159796

    申请日：1995-10-03

    Applicant: SMITH INTERNATIONAL

    Inventor： LARSEN JAMES L ,  SIRACKI MICHAEL A ,  OLDHAM THOMAS W ,  KESHAVAN MADAPUSI K

    IPC: E21B10/18 ,  E21B10/60 ,  E21B10/61 ,  E21B10/62

    Abstract: A composite mini-extended nozzle is disclosed that is designed to both resist erosion and be strong enough to withstand the shock of a downhole dri lling environment. In addition, means are provided to shroud at least a portion of theextended nozzle to further protect a portion of the nozzle nearest the exit plane from downhole obstructions. A combination of materials used to form the nozz le may include a matrix of tungsten carbides with suitable binder joined to an outer metal jacket nozzle body. A third ceramic matrix material may be utilized to line or partially line an interior passage formed by the mini-extended nozzle and a reduced in diameter portion of the nozzle design may include a built-in frac tureplane in the unlikely event the end of the nozzle hi ts an obstruction. The extended portion of the nozzle will shear off along this fracture plane thereby preve nting a nozzle washout that likely would result in a trip out of the hole to repair the resultant damage to the rock bit.

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