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    O-RING SEAL WITH LUBRICANT ADDITIVES FOR ROCK BIT BEARINGS
    3.
    发明专利
    O-RING SEAL WITH LUBRICANT ADDITIVES FOR ROCK BIT BEARINGS 未知

    公开(公告)号：CA2217751A1

    公开(公告)日：1998-04-08

    申请号：CA2217751

    申请日：1997-10-08

    Applicant: SMITH INTERNATIONAL

    Inventor： DENTON ROBERT ,  PETERSON STEVEN W ,  FANG ZHIGANG

    IPC: E21B10/22 ,  E21B10/25 ,  F16J15/06 ,  F16J15/32 ,  E21B10/24

    Abstract: O-ring seals for rock bit bearings comprise a body formed from an elastomeric ma terial having one or more lubricant additive uniformly distributed throughout to reduce the co efficient of friction and stick slick amplitude at O-ring seal surfaces. The lubricant additi ves are selected from the group consisting of polytetrafluoroethylene, hexagonal boron nitride, f lake graphite, ultra-high molecular weight polyurethane, and mixtures thereof. O-ring seals mad e from elastomeric compositions of this invention comprise in the range of from about 8 5 to 99 percent by volume elastomeric material, and in the range of from about 1 to 15 percent b y volume of the lubricant additives based on the total volume of the composition.

    O-Ring Seal for Rock Bit Bearings
    5.
    发明专利
    O-Ring Seal for Rock Bit Bearings 未知

    公开(公告)号：CA2144116A1

    公开(公告)日：1995-09-09

    申请号：CA2144116

    申请日：1995-03-07

    Applicant: SMITH INTERNATIONAL

    Inventor： DENTON ROBERT ,  KESHAVAN MADAPUSI K ,  PETERSON STEVEN W

    IPC: E21B10/22 ,  E21B10/25 ,  E21B10/00

    Abstract: An improved O-ring seal for rock bit bearings comprises a body formed from a resilient elastomeric composition and a modified surface comprising a surface enhancing material integral with the body. The surface comprises a layer of surface enhancing material that encapsulates and is molecularly bonded to an underlying surface of an elastomeric seal body. The surface enhancing material selected may include metal disulfides, fluoropolymers, ethylene polymers, silicone polymers, and urethane polymers. The O-ring surface displays enhanced properties of reduced break-off friction, increased lubricity and wettablity, and increased thermal resistance. These enhanced surface properties serve to minimize stick-slip and material loss from the O-ring surface resulting from stick-slip, thereby increasing the service life of the O-ring seal and rock bit.

    O'RING SEAL FOR ROCK BIT BEARINGS
    6.
    发明专利
    O'RING SEAL FOR ROCK BIT BEARINGS 未知

    公开(公告)号：CA2096300A1

    公开(公告)日：1993-11-16

    申请号：CA2096300

    申请日：1993-05-14

    Applicant: SMITH INTERNATIONAL

    Inventor： DENTON ROBERT

    IPC: C08K3/04 ,  C08L15/00 ,  E21B10/22 ,  E21B10/25 ,  F16J15/32 ,  F16J15/54

    Abstract: A dynamic O-ring seal for retaining the lubrication around a rock bit bearing for drilling subterranean formations has a composition comprising 100 parts by weight highly-saturated nitrile elastomer, furnace black in the range of from 40 to 70 parts by weight, peroxide curing agent in the range of from 7 to parts by weight, graphite in the range of from 10 to parts lay weight, zinc oxide or magnesium oxide in the range of from 4 to 7 parts by weight, stearic acid in the range of from 0.5 to 2 parts by weight, and sufficient plasticizer to provide a Shore hardness no more than A 80.

    Elastomeric seals
    9.
    发明专利
    Elastomeric seals 未知

    公开(公告)号：GB2402981B

    公开(公告)日：2007-01-10

    申请号：GB0412992

    申请日：2004-06-11

    Applicant: SMITH INTERNATIONAL

    Inventor： KESHAVAN MADAPUSI K ,  GRIFFO ANTHONY ,  WHITE ALYSIA CANSON ,  DENTON ROBERT ,  HEEL PATRICIA ,  TINKHAM LEROY N ,  SIRACKI MICHAEL A

    IPC: F16J15/10 ,  E21B10/22 ,  F16J15/20 ,  F16J15/32

    Abstract: Ordered elastomeric composites comprise an ordered arrangement of a number of first elastomeric phases distributed uniformly within a continuous matrix second elastomeric phase. The second phase can be formed from an elastomeric material that is relatively harder than an elastomeric material that is used to form the first phases. Each first phase can be in the form of a core having a defined length and diameter, and the second phase can be formed from a number of shells that each surround a respective core. In a preferred embodiment, the arrangement of cores and shells are aligned coaxially with one another to provide a cellular structure. Ordered elastomeric composites of this invention can be used to form part of or an entire elastomeric seal, e.g., in the form of an annular ring adapted for use in a rotary cone drill bit.

    ORDERED ELASTOMERIC COMPOSITE MATERIAL
    10.
    发明专利
    ORDERED ELASTOMERIC COMPOSITE MATERIAL 未知

    公开(公告)号：CA2470797A1

    公开(公告)日：2004-12-11

    申请号：CA2470797

    申请日：2004-06-11

    Applicant: SMITH INTERNATIONAL

    Inventor： DENTON ROBERT ,  WHITE ALYSIA C ,  SIRACKI MICHAEL A ,  KESHAVAN MADAPUSI K ,  HEEL PATRICIA ,  TINKHAM LEROY N ,  GRIFFO ANTHONY

    IPC: F16J15/10 ,  F16J15/32 ,  E21B10/08

    Abstract: Ordered elastomeric composites comprise an ordered arrangement of a number of first elastomeric phases distributed uniformly within a continuous matrix second elastomeric phase. The second phase can be formed from an elastomeric material that is relative ly harder than an elastomeric material that is used to form the first phases. Each first phase can be in the form of a core having a defined length and diameter, and the second phase can be forme d from a number of shells that each surround a respective core. In a preferred embodiment, the arrangement of cores and shells are aligned coaxially with one another to provide a cellular structure. Ordered elastomeric composites of this invention can be used to form part of or an entire elastomeric seal, e. g., in the form of an annular ring adapted for use in a rotary cone drill bit.

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