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    Cutter element
    2.
    发明专利
    Cutter element 未知

    公开(公告)号：GB2357532B

    公开(公告)日：2004-06-16

    申请号：GB0030664

    申请日：2000-12-15

    Applicant: SMITH INTERNATIONAL

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

    IPC: E21B10/56 ,  E21B10/567 ,  E21B10/573 ,  E21B17/10

    Abstract: A cutter element for use in a drill bit, comprising a substrate and a cutting layer. The substrate comprises a grip portion and an extension portion, where the grip portion has an insert axis and an extension portion including an interface surface having a first apex. The cutting layer is affixed to the interface surface and has a cutting surface having a second apex. The cutting layer is shaped such that when a plane passing through the first apex and lying parallel to the insert axis and normal to a radius from the insert axis, the plane divides the cutting layer into major and minor portions and the major portion has a major volume that is at least 60 percent of the total volume of said cutting layer. Alternative embodiments of the present invention include variations wherein the first and second apices do not coincide and wherein the interface surface of the substrate is not axisymmetric. Using these variations, cutter elements having sizeable variations in thickness are constructed.

    Single-cone rock bit having cutting structure adapted to improve hole cleaning,and to reduce tracking and bit balling
    5.
    发明专利
    Single-cone rock bit having cutting structure adapted to improve hole cleaning,and to reduce tracking and bit balling 未知

    公开(公告)号：GB2388857B

    公开(公告)日：2004-11-17

    申请号：GB0310084

    申请日：2003-05-01

    Applicant: SMITH INTERNATIONAL

    Inventor： XIANG YING ,  WITMAN IV GEORGE BODO ,  SIRACKI MICHAEL ALLEN

    IPC: E21B10/16

    Abstract: A roller cone drill bit is disclosed which includes a bit body adapted to be coupled to a drill string, a bearing journal depending from the bit body and a single roller cone rotatably attached to the journal. The roller cone has a plurality of inserts disposed thereon. In one aspect, the inserts have an extension length of at least 0.6 inches. A roller cone drill bit is disclosed, including a bit body, a bearing journal depending from the bit body, and a single roller cone rotatably attached to the journal. The roller cone has a plurality of inserts disposed thereon. In another aspect, the inserts are arranged such that at most about 20 percent of the inserts are crossed substantially at centerlines thereof by any single plane which contains the axis of the cone axis 10 and which crosses at least two of the inserts.

    Nozzle retention body
    7.
    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).

    Single-cone rock bit
    9.
    发明专利
    Single-cone rock bit 未知

    公开(公告)号：GB2388857A

    公开(公告)日：2003-11-26

    申请号：GB0310084

    申请日：2003-05-01

    Applicant: SMITH INTERNATIONAL

    Inventor： XIANG YING ,  WITMAN IV GEORGE BODO ,  SIRACKI MICHAEL ALLEN

    IPC: E21B10/16

    Abstract: A roller cone drill bit comprises a bit body 1 adapted to be coupled to a drill string, a bearing journal 1A depending from the bit body and a single roller cone 6 carrying inserts 5 rotatably attached to the bearing journal. The journal defines a rotation angle a between the axis of rotation 11 of the bit such that the roller cone includes an intermittent contact zone 20 and a continuous contact zone 22 thereon. The inserts 5 in the continuous contact zone 22 are made from a super hard material, such as diamond or boron nitride. The inserts may have an extension length of at least 0.6 inches (1.524 cm), may be arranged in columns such that one of the inserts is overlapped only by an adjacent one of the inserts in one of the columns, or may be arranged in helical columns, the columns being arranged so that a plane containing the axis of the cone intersects at least one and at most two of the columns on one side of the cone surface.

    Self relieving seal
    10.
    发明专利
    Self relieving seal 未知

    公开(公告)号：GB2387192A

    公开(公告)日：2003-10-08

    申请号：GB0307665

    申请日：2003-04-03

    Applicant: SMITH INTERNATIONAL

    Inventor： NEVILLE JAMES L ,  LARSEN JAMES L ,  PETERSON STEVEN WILFORD ,  BANDI MANIKIRAN ,  LOCKSTEDT ALAN W ,  CARIVEAU PETER T ,  WHITE ALYSIA CANSON ,  GRIFFO ANTHONY ,  SIRACKI MICHAEL ALLEN

    IPC: E21B10/22 ,  E21B10/25

    Abstract: Self relieving seals of this invention comprise an elastomeric seal body having a first sealing surface and a second sealing surface for contact with respective drill bit sealing surfaces. The seal includes a pair of external surfaces that each extend along the seal body between the first and second sealing surfaces. The seal includes one or more relief ports that are disposed through the seal body and that have openings through each of the seal body external surfaces. The relief port can be specially configured, e.g., have different diameter sections of constant or variable dimensions, to provide a degree of control over pressure equalization through the seal body when the seal is loaded within the drill bit. The seal may include an element, e.g., solid, tubular, or porous, disposed within the relief port to provide a further desired degree of control over pressure equalization though the seal when the seal is loaded within the drill bit. Surface features, on the seal or the drill bit, can be provided to offset the relief port opening from the rock bit so that it is not blocked off. The seal can include a valve mechanism to provide a further degree of control over fluid passage through the relief port.

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