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    DRILL PIPE INSIDE BLOWOUT PREVENTER
    11.
    发明专利
    DRILL PIPE INSIDE BLOWOUT PREVENTER 未知

    公开(公告)号：CA1234540A

    公开(公告)日：1988-03-29

    申请号：CA479698

    申请日：1985-04-22

    Applicant: HUGHES TOOL CO

    Inventor： CUNNINGHAM ROBERT A

    IPC: E21B21/10 ,  E21B34/08 ,  E21B33/06

    Abstract: An inside blowout preventer for use in an earth boring drill string has features to reduce erosion. The blowout preventer has a valve body for connection into the drill string with a longitudinal passage extending through the body. The ball seat is located in the longitudinal passage. A ball storage location is located below the seat, and offset from the longitudinal passage. A ball is carried in the storage location during downward flow, and moves into the longitudinal passage to seat against the seat if the upward flow is sufficient. The storage location is located in an area of the longitudinal passage which has a much larger flow area than through the seat. The downward flow impinges on a portion of the ball. A communication passage extends from the storage location downward to a reduced diameter section of the longitudinal passage.

    SHAFT DRILL BIT WITH OVERLAPPING CUTTER ARRANGEMENT
    13.
    发明专利
    SHAFT DRILL BIT WITH OVERLAPPING CUTTER ARRANGEMENT 未知

    公开(公告)号：CA1110226A

    公开(公告)日：1981-10-06

    申请号：CA341026

    申请日：1979-11-30

    Applicant: HUGHES TOOL CO

    Inventor： CUNNINGHAM ROBERT A ,  PESSIER RUDOLF C O

    IPC: E21B7/28 ,  E21B10/12 ,  E21B10/16 ,  E21B10/28 ,  E21B10/52 ,  E21B9/12 ,  E21B9/24

    Abstract: An earth boring drill bit for large diameter shafts has an improved cutter arrangement. The drill bit has a cutter support member with a number of cutters mounted to it for disintergrating with earth formation face. At least one inner cutter is mounted near the center for cutting the center area. A number of gage cutters are mounted at the periphery to cut the gage area of the shaft. A number of intermediate cutters are spaced between the inner and gage cutters. Each intermediate cutter overlaps one-half of its width with an adjacent intermediate cutter.

    TOOL JOINT WITH INTERNAL/EXTERNAL MAKE-UP SHOULDER
    16.
    发明专利
    TOOL JOINT WITH INTERNAL/EXTERNAL MAKE-UP SHOULDER 未知

    公开(公告)号：CA1182490A

    公开(公告)日：1985-02-12

    申请号：CA410430

    申请日：1982-08-30

    Applicant: HUGHES TOOL CO

    Inventor： HALL JAMES R ,  CUNNINGHAM ROBERT A

    IPC: E21B17/042 ,  F16L15/06 ,  F16L15/00

    Abstract: A tool joint for earth boring drill pipe members has features that increase the amount of torque required to yield the connection. The tool joint has both external and internal make-up shoulders. The pin and box are dimensioned so that the box face contacts the external shoulder while there still is a clearance between the pin face the internal shoulder. At normal make-up torque, the external shoulder will be tightened to its normal amount. The internal shoulder will tighten to its yield only if additional torque is encountered while drilling. The internal shoulder adds to the amount of torque required to yield the tool joint connection.

    Inside downhole blowout preventer
    18.
    发明专利
    Inside downhole blowout preventer 未知

    公开(公告)号：GB2102474A

    公开(公告)日：1983-02-02

    申请号：GB8219071

    申请日：1982-07-01

    Applicant: HUGHES TOOL CO

    Inventor： CUNNINGHAM ROBERT A ,  BAUGH JOHN LINDLEY

    IPC: E21B21/10 ,  E21B34/08

    Abstract: An inside blowout preventer assembly for connection into a drill string for earth boring for minimizing fluid erosion, has a centralized ball valve retainer 39 with an annular flow area larger in comparison with the area of the opening 55 of the seat 51 to control the flow rate to levels to minimize erosion. The surfaces 31,33 of the inside of the assembly are tapered to further minimize turbulence and erosion. The retainer 39 that holds the ball valve 43 in a centralized position has a flow passage 45 causing the ball valve 43 to be stationary during downward fluid flow and to assist upward movement during upward flow. Inserts 29,37 are utilized to form the inside of the assembly to simplify construction and enable easy replacement.

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