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    PLUG FOR WELL DRILLING PROVIDED WITH RING-SHAPED RATCHET STRUCTURE
    1.
    发明申请
    PLUG FOR WELL DRILLING PROVIDED WITH RING-SHAPED RATCHET STRUCTURE 审中-公开

    公开(公告)号：US20170218720A1

    公开(公告)日：2017-08-03

    申请号：US15489924

    申请日：2017-04-18

    Applicant: KUREHA CORPORATION

    Inventor： Takeo TAKAHASHI ,  Masayuki OKURA

    IPC: E21B33/12 ,  E21B33/129

    CPC classification number: E21B33/1208 ,  C09K8/426 ,  E21B23/06 ,  E21B29/02 ,  E21B33/128 ,  E21B33/1291 ,  E21B43/26

    Abstract: A plug for well drilling comprising a mandrel and members attached on an outer circumferential surface orthogonal to an axial direction of the mandrel, wherein at least one of the members or the mandrel is formed from a degradable material; a ring-shaped ratchet structure formed from a plurality of interlocking parts that allows movement of the member in one direction along the axial direction of the mandrel and restricts movement in the opposite direction is provided on an inner circumferential surface of the member and the outer circumferential surface of the mandrel; preferably further comprising a pushing jig including a ratchet structure and a ring-shaped plate adjacent to the axial direction leading side of the pushing jig. Additionally, a well drilling method using the plug for well drilling, comprising degrading a part or all of the plug after blocking a borehole.

    METHOD FOR PRODUCING RUBBER MEMBER FOR DOWNHOLE TOOL
    3.
    发明申请
    METHOD FOR PRODUCING RUBBER MEMBER FOR DOWNHOLE TOOL 审中-公开

    公开(公告)号：US20190382520A1

    公开(公告)日：2019-12-19

    申请号：US16515221

    申请日：2019-07-18

    Applicant: Kureha Corporation

    Inventor： Takeo TAKAHASHI ,  Masayuki OKURA

    IPC: C08G18/32 ,  E21B33/12

    Abstract: Provided is a rubber member for downhole tools, of which a decrease rate of 50% strain compressive stress after immersion for 24 hours in 150° C. water relative to 50% strain compressive stress before immersion is not less than 5%, and preferably not less than 50%. The rubber member is suitable for a seal member, ball sealer, ball seat, and a protecting member. Also provided is a downhole tool comprising the rubber member, and a method for recovering a hydrocarbon resource using the downhole tool.

    POLY-L-LACTIC ACID SOLID-STATE EXTRUSION MOLDED ARTICLE, METHOD FOR PRODUCING THE SAME, AND USE APPLICATIONS OF THE SAME
    6.
    发明申请
    POLY-L-LACTIC ACID SOLID-STATE EXTRUSION MOLDED ARTICLE, METHOD FOR PRODUCING THE SAME, AND USE APPLICATIONS OF THE SAME 审中-公开
    聚-L-酸乳酸固体挤出成型制品及其制造方法及其应用

    公开(公告)号：US20150354311A1

    公开(公告)日：2015-12-10

    申请号：US14759958

    申请日：2014-01-09

    Applicant: (KUREHA CORPORATION)

    Inventor： Masayuki OKURA ,  Takeo TAKAHASHI ,  Hiroyuki SATO

    IPC: E21B33/12 ,  B29C71/02 ,  E21B7/00 ,  B29C47/00

    CPC classification number: E21B33/12 ,  B29C47/0004 ,  B29C47/0009 ,  B29C47/0057 ,  B29C47/92 ,  B29C71/02 ,  B29C2071/022 ,  B29C2947/92695 ,  B29C2947/92704 ,  B29K2067/046 ,  B29L2031/26 ,  C08J5/04 ,  C08J2367/04 ,  E21B7/00 ,  E21B33/138

    Abstract: A poly-L-lactic acid (PLLA) solid-state extrusion molded article having a weight average molecular weight of from 100,000 to 380,000 and a melt viscosity of from 20 to 2,000 Pa·s (at a temperature of 240° C. and a shear rate of 120 sec−1) and having an L-form content of from 80 to 100%, the article having a thickness or diameter of from 10 to 500 mm and a tensile strength of from 5 to 100 MPa at a temperature of 66° C. (the article may contain a filler and have a tensile strength of from 5 to 200 MPa); a downhole tool member or a ball sealer for well drilling and completion formed by machining the solid-state extrusion molded article; an isolation plug provided with the downhole tool member; and a production method for a PLLA solid-state extrusion molded article comprising steps of supplying a resin material containing a PLLA to an extruder, solid-state extrusion molding the material, pressurizing the solid-state extrusion molded product, drawing the pressurized product while applying a back pressure in the direction of a forming die to suppress the expansion of the solid-state extrusion molded product; and a well drilling and completion method.

    Abstract translation: 一种聚L-乳酸（PLLA）固态挤出成型制品，其重均分子量为100,000至380,000，熔体粘度为20至2,000Pa·s（温度为240℃， 剪切速率为120秒-1），L型含量为80〜100％，制品的厚度或直径为10〜500mm，拉伸强度为5〜100MPa，温度为66℃ （制品可能含有填料，拉伸强度为5〜200MPa）; 用于通过机械加工固态挤出成型制品而形成的用于钻井和完井的井下工具构件或球封闭器; 设置有井下工具构件的隔离塞; 以及PLLA固态挤出成型制品的制造方法，包括以下步骤：向挤出机供给含有PLLA的树脂材料，固态挤出成型材料，对固态挤压成型体进行加压，同时施加加压制品 在成形模的方向上的背压抑制固态挤压成型品的膨胀; 以及钻井和完井方法。

    PLUG FOR WELL DRILLING PROVIDED WITH DIAMETRICALLY EXPANDABLE ANNULAR RUBBER MEMBER FORMED FROM DEGRADABLE RUBBER MATERIAL
    9.
    发明申请
    PLUG FOR WELL DRILLING PROVIDED WITH DIAMETRICALLY EXPANDABLE ANNULAR RUBBER MEMBER FORMED FROM DEGRADABLE RUBBER MATERIAL 审中-公开

    公开(公告)号：US20170158942A1

    公开(公告)日：2017-06-08

    申请号：US15039186

    申请日：2014-12-22

    Applicant: Kureha Corporation

    Inventor： Masayuki OKURA ,  Takeo TAKAHASHI

    IPC: C09K8/42 ,  E21B33/128 ,  E21B33/12

    Abstract: A plug for well drilling includes a mandrel and at least one diametrically expandable annular rubber member and at least one slip disposed on an outer circumferential surface orthogonal to an axial direction of the mandrel; (i) the mandrel being formed from a degradable material; and (ii) the at least one diametrically expandable annular rubber member being formed from a degradable rubber material having a rate of decrease of not less than 5% in 50% strain compressive stress after immersion in water at a temperature of 150° C. for 24 hours relative to the compressive stress before immersion; and/or having a rate of loss of mass of from 5 to 100% after immersion in water at a temperature of 150° C. for 72 hours relative to the mass before immersion. A well drilling method includes a step of isolating a borehole using the plug for well drilling, part or all of the plug being degraded thereafter.

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