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    DIRECTIONAL FLOW NOZZLE RETENTION BODY
    1.
    发明专利
    DIRECTIONAL FLOW NOZZLE RETENTION BODY 未知

    公开(公告)号：CA2343987C

    公开(公告)日：2007-02-13

    申请号：CA2343987

    申请日：2001-04-12

    Applicant: SMITH INTERNATIONAL

    Inventor： SIRACKI MICHAEL A ,  CAWTHORNE CHRIS E ,  NGUYEN QUAN V ,  LARSEN JAMES L

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

    Abstract: A drill bit having one or more nozzle retention bodies attached by a single orientation mounting is disclosed, as is the associated method for its manufacture. The upper end of the nozzle retention body has a fluid inlet in communication with the internal fluid plenum of the drill bit, and the lower end of the nozzle retention body includes a fluid outlet that defines an exit flow angle. The exit flow angle is angularly disposed from the longitudinal axis of the drill bit. The nozzle retention body may advantageously be chamfered or the like to provide a reduced cross-sectional area at the lower end of the nozzle retention body. The oute r surface of the nozzle retention body (and attached hardened elements) may extend substantially to gage, or may fall short of that diameter.

    ULTRA HARD INSERT CUTTERS FOR HEEL ROW ROTARY CONE ROCK BIT APPLICATIONS
    2.
    发明专利
    ULTRA HARD INSERT CUTTERS FOR HEEL ROW ROTARY CONE ROCK BIT APPLICATIONS 未知

    公开(公告)号：CA2113054C

    公开(公告)日：2006-12-12

    申请号：CA2113054

    申请日：1994-01-07

    Applicant: SMITH INTERNATIONAL

    Inventor： CAWTHORNE CHRIS E ,  PORTWOOD GARY ,  SIRACKI MICHAEL A

    IPC: E21B10/16 ,  E21B10/52 ,  E21B10/56 ,  E21B10/567

    Abstract: A rotary cone rock bit for drilling boreholes in an earthen formation has one or more rotary cones rotatively retained an a journal bearing connected to the rock bit body. These rotary cones have a plurality of tungsten carbide inserts and a gage row of tungsten carbide inserts for drilling the hole diameter. A circumferential heel row has extended ultra hard shaped cutters spaced within the heel row. Each of the shaped cutters has a cutting edge that shears a borehole wall formed by the formation as the rotary cone rotates against a bottom of the borehole formed by the formation. The shaped cutters serve to maintain the borehole diameter and to divert formation debris away from bearing surfaces formed between the rotary cone and the journal bearing. Preferably. the ultra hard cutters have a polycrystalline diamond cutting edge:

    DUAL FUNCTIONING SEAL FOR ROCK BITS
    5.
    发明专利
    DUAL FUNCTIONING SEAL FOR ROCK BITS 未知

    公开(公告)号：CA2217592C

    公开(公告)日：2004-01-13

    申请号：CA2217592

    申请日：1997-10-07

    Applicant: SMITH INTERNATIONAL

    Inventor： CAWTHORNE CHRIS E ,  HUANG SUJIAN ,  FANG ZHIGANG ,  SIRACKI MICHAEL A

    IPC: E21B10/22 ,  E21B10/25 ,  F16J15/32 ,  F16J15/34 ,  E21B10/08

    Abstract: Dual functioning seals for use in forming a lubricant seal in a rotary rock bit comprise an annular elastomeric seal body having a dynamic seal surface for sealing against a dynamic surface and a static seal surface for sealing against a static surface. The seal body has an asymmetric axial cross-sectional geometry the dynamic seal surface having a greater radius of curvature than that of the static seal surface. The dynamic and static seal surfaces are formed from different elastomeric materials, and the dynamic seal surface is formed from an elastomeric material that is harder and more wear resistant than the elastomeric material used to form the static seal surface. A rotary rock bit seal constructed in this manner is well adapted to accommodate the different operating conditions and sealing requirements that exist both at the dynamic and static surfaces of the seal to ensure optimal seal performance and, thereby enhance the service life of the rock bit.

    ROCK BIT SEAL WITH EXTRUSION PREVENTION MEMBER
    6.
    发明专利
    ROCK BIT SEAL WITH EXTRUSION PREVENTION MEMBER 未知

    公开(公告)号：CA2397141A1

    公开(公告)日：2003-02-08

    申请号：CA2397141

    申请日：2002-08-08

    Applicant: SMITH INTERNATIONAL

    Inventor： CAWTHORNE CHRIS E ,  MOURIK NEPHI M

    IPC: E21B10/22 ,  E21B10/25 ,  E21B10/08

    Abstract: Annular seals of this invention comprise an elastomeric seal body that is configured to fit within a seal gland of a rock bit. The seal comprises a first seal surface, for providing a seal along a dynamic rotary surface formed between the seal body and one portion of the rock bit, and a second seal surface, for providing a seal between the seal body and another portion of the .rock bit. The annular seal further comprises an extrusion prevention member that is positioned adjacent a surface of the seal body between the first and second seal surfaces. The extrusion prevention member can be integral, partially-attached, or independent of the seal body. The extrusion prevention member is preferably formed from a material having a hardness that is greater than that of the seal body. The member is positioned along the seal body at a location adjacent a groove, formed between opposed members of the rock bit, to act as a physical barrier to prevent the seal from being extruded therethrough.

    Nozzle retention body
    8.
    发明专利
    Nozzle retention body 未知

    公开(公告)号：GB2361728A

    公开(公告)日：2001-10-31

    申请号：GB0109304

    申请日：2001-04-12

    Applicant: SMITH INTERNATIONAL

    Inventor： NGUYEN QUAN VAN ,  SIRACKI MICHAEL ALLEN ,  LARSEN JAMES L ,  CAWTHORNE CHRIS E

    IPC: E21B10/18 ,  E21B10/60 ,  E21B10/61 ,  E21B10/22

    Abstract: A drill bit has a nozzle retention body (130), where the upper end of a nozzle retention body (130) has a fluid inlet (230) in communication with an internal fluid plenum (13) of the drill bit (100) and the lower end includes a fluid outlet that defines an axial flow angle. The exit flow angle is angularly disposed from the longitudinal axis of the drill bit. The nozzle retention body (130) may be chamfered to provide a reduced cross-sectional area at the lower end of the nozzle retention body (130).

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