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公开(公告)号：US10900595B2
公开(公告)日：2021-01-26
申请号：US16077912
申请日：2016-12-16
发明人： Takamasa Kawai , Taro Kanayama , Masaki Yoshikawa , Haruhiko Seki , Masateru Ueta , Jun Takano , Tsuyoshi Yoneyama
IPC分类号： F16L15/04 , E21B17/042
摘要： Provided is a threaded joint for an oil well tubing which possesses sufficient sealability when the external pressure is applied to the threaded joint by suppressing the plastic deformation of a nose portion and sufficient galling resistance. The sufficient galling resistance is provided by preventing the occurrence of galling at the time of making up the threaded joint during verification test performed in accordance with ISO13679:2002 even when the threaded joint for an oil well tubing has a small thickness. Parameters including sizes of the threaded joint at positions of a seal point and shoulder portions satisfy formula 1 ((Ds12−Ds02)/(D12−D02)≥0.30), formula 2 (tan θ>(ΔD+δ)/{2(Lt−Ls)}), and Ls/Ln is set to 0.2 to 0.6.
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公开(公告)号：US10443765B2
公开(公告)日：2019-10-15
申请号：US14768661
申请日：2013-12-18
发明人： Takuya Nagahama , Hiroshi Chikatsune , Kazunari Takahashi , Masaki Yoshikawa , Jun Takano , Masateru Ueta , Takamasa Kawai
IPC分类号： F16L15/06 , F16L15/00 , E21B17/042
摘要： A threaded joint for pipes including a pin and a box, characterized in that the relationship 0.05 degrees≤θsb−θsp≤2.0 degrees is satisfied, where θsb is an angle of an insertion surface of the female thread on the box side relative to a plane perpendicular to an axis of pipe, and θsp is an angle of an insertion surface of the male thread, which faces the insertion surface of the female thread, on the pin side relative to the plane perpendicular to the axis of pipe.
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公开(公告)号：US09982815B2
公开(公告)日：2018-05-29
申请号：US14908062
申请日：2014-07-29
发明人： Takamasa Kawai , Kazunari Takahashi , Hiroshi Chikatsune , Masaki Yoshikawa , Jun Takano , Takuya Nagahama , Masateru Ueta , Hideo Sato , Haruhiko Seki , Tsuyoshi Yoneyama
IPC分类号： F16L15/06 , E21B17/08 , E21B17/042
CPC分类号： F16L15/06 , E21B17/042 , E21B17/08
摘要： A premium threaded joint has a pin-side shoulder angle θ1, a box-side shoulder angle θ2, a seal interference quantity δ and a seal point distance xp satisfying θ2−θ1=α×δ/xp, α=7 to 14, and a pin distal end thickness tp1 defined by a difference Re−Ri between a radius Re of a pin most distal end portion and an inner radius Ri of a pin distal end portion is 0.25 times or more as large as a pin raw pipe thickness tp0.
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公开(公告)号：US20150198270A1
公开(公告)日：2015-07-16
申请号：US14412286
申请日：2013-07-01
发明人： Takuya Nagahama , Kazunari Takahashi , Hiroshi Chikatsune , Masaki Yoshikawa , Jun Takano , Takamasa Kawai , Masateru Ueta
IPC分类号： F16L15/00
CPC分类号： F16L15/00 , E21B17/042 , E21B17/08 , F16L15/004 , F16L15/06 , F16L2201/40
摘要： A threaded joint for pipes is provided in which a box-side lip length L, which is the axial distance between a pin-nose-end corresponding point P of the box component 1 and a load surface 18b of a lip-side internal thread ridge 50 closest to the pin-nose-end corresponding point P, is 300 or more times as long as an insertion surface interval δ, which is the axial interval between an insertion surface 19b of an internal thread ridge at a position two or more ridges backwards from the lip-side internal thread ridge 50 and an insertion surface 19a of an external thread ridge facing the insertion surface 19b when tightened, that is, L≧300×δ.
摘要翻译： 提供了一种用于管道的螺纹接头，其中盒侧唇长度L是箱部件1的销鼻端对应点P与唇侧内螺纹脊的载荷面18b之间的轴向距离 最接近针鼻端部对应点P的距离为距离位于两个或更多个脊部的内螺纹脊的插入表面19b之间的轴向间隔的插入表面间隔δ的300倍或更多倍的300倍或更多倍 从唇缘内螺纹脊50和紧固插入面19b的外螺纹的插入面19a，即L≥300×δ。
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公开(公告)号：US11905765B2
公开(公告)日：2024-02-20
申请号：US17757722
申请日：2020-09-11
发明人： Jun Takano , Takamasa Kawai , Takuya Nagahama , Seigo Goto , Masaki Yoshikawa , Tsuyoshi Yoneyama
IPC分类号： F16L15/06 , E21B17/042 , F16L15/00
CPC分类号： E21B17/042 , F16L15/001 , F16L15/06
摘要： To prevent fracture of a box under a tensile load without increasing the outer diameter of the box. The presently disclosed threaded joint for pipes includes a pin provided with a male thread portion at one end of a first pipe, and a box provided with a female thread portion at one end of a second pipe, where each of a plurality of thread grooves of the female thread portion has a corner portion on a load flank side and a corner portion on a stabbing flank side on a thread bottom side, a corner portion on a load flank side of a first thread groove includes a first arc portion that has a first curvature radius, and a second arc portion that has a second curvature radius, and a ratio of the second curvature radius to the first curvature radius is 3 or more.
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公开(公告)号：US11053749B2
公开(公告)日：2021-07-06
申请号：US16328006
申请日：2017-09-13
发明人： Takamasa Kawai , Taro Kanayama , Masaki Yoshikawa , Jun Takano , Takuya Nagahama
IPC分类号： F16L15/00 , E21B17/08 , F16L15/04 , E21B17/042
摘要： A threaded joint for oil well steel pipe is provided. The threaded joint includes a pin provided with a male thread, and a box provided with a female thread threadedly engaged with the male thread, and at an outer periphery side sealing portion, a cross-sectional area S1 of the pin at a seal point, and a cross-sectional area S0 of a pipe body portion, which is an unprocessed pin portion, satisfy an expression (S1/S0)×100≥15(%), at an inner periphery side sealing portion, a cross-sectional area S2 of the box at a seal point, and a cross-sectional area S0′ of a pipe body portion, which is an unprocessed box portion satisfy an expression (S2/S0′)×100≥20(%), and a surface area S3 of a contact portion of an intermediate shoulder between thread rows and the cross-sectional area S0 satisfy the expression (S3/S0)×100≥10(%).
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公开(公告)号：US10295091B2
公开(公告)日：2019-05-21
申请号：US15111544
申请日：2014-12-18
发明人： Masaki Yoshikawa , Hiroshi Chikatsune , Kazunari Takahashi , Takuya Nagahama , Jun Takano , Masateru Ueta , Takamasa Kawai
IPC分类号： F16L25/00 , F16L15/00 , E21B17/042 , F16L15/06
摘要： A threaded joint is adapted for tubes where the stress or the strain concentration hardly occur at a threaded corner portion of box side even when the threaded joint receives repeated tensile-compressive forces or repeated bending forces. In a radial seal type threaded joint, tensile efficiency TE (%) defined by a ratio Sc/Sp between a cross-sectional area Sc, an area of Critical Cross Section (CCS) including a portion where a tensile stress and a strain become the highest in a tube circumferential cross section of a box and a cross-sectional area Sp of a tube body satisfies formula TE (%)≥2.25×t/ρ+99.9 having a ratio t/ρ between an internal thread height t of the box and a radius of curvature ρ of a corner portion of internally-threaded bottom load surface side.
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公开(公告)号：US20190056049A1
公开(公告)日：2019-02-21
申请号：US16077912
申请日：2016-12-16
发明人： Takamasa Kawai , Taro Kanayama , Masaki Yoshikawa , Haruhiko Seki , Masateru Ueta , Jun Takano , Tsuyoshi Yoneyama
IPC分类号： F16L15/04
摘要： Provided is a threaded joint for an oil well tubing which possesses sufficient sealability when the external pressure is applied to the threaded joint by suppressing the plastic deformation of a nose portion and sufficient galling resistance. The sufficient galling resistance is provided by preventing the occurrence of galling at the time of making up the threaded joint during verification test performed in accordance with ISO13679:2002 even when the threaded joint for an oil well tubing has a small thickness. Parameters including sizes of the threaded joint at positions of a seal point and shoulder portions satisfy formula 1 ((Ds12−Ds02)/(D12−D02)≥0.30), formula 2 (tan θ>(ΔD+δ)/{2(Lt−Ls)}), and Ls/Ln is set to 0.2 to 0.6.
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公开(公告)号：US20160319966A1
公开(公告)日：2016-11-03
申请号：US15108856
申请日：2014-10-30
发明人： Takamasa Kawai , Kazunari Takahashi , Hiroshi Chikatsune , Masaki Yoshikawa , Jun Takano , Takuya Nagahama , Masateru Ueta , Tsuyoshi Yoneyama , Hideo Sato , Haruhiko Seki
IPC分类号： F16L15/04 , F16L15/06 , E21B17/042 , F16L15/00
CPC分类号： F16L15/04 , E21B17/042 , F16L15/004 , F16L15/06
摘要： A threaded joint for heavy-walled oil country tubular goods can both ensure sealability and prevent galling in a state where a high external pressure is also applied to the threaded joint in addition to a high compressive force. A surface of a pin side forming a seal portion and a surface of a box side forming a seal portion are formed into a convex curved surface and a tapered surface, respectively. A seal thickness ts of the pin is 15 mm or less, a shape parameter ts/D (D: outer diameter of a pin raw pipe portion) is 0.045 or more, and a complete thread length ratio L/t (L: complete thread length of the pin, t: wall thickness of the pin raw pipe portion) is 4.0 or less.
摘要翻译： 用于重型油井筒的螺纹接头除了具有高的压缩力之外，还可以在螺纹接头上施加高的外部压力的状态下确保密封性并防止磨损。 形成密封部的销侧的表面和形成密封部的盒侧的表面分别形成为凸曲面和锥面。 销的密封厚度ts为15mm以下，形状参数ts / D（D：销原料管部的外径）为0.045以上，完全螺纹长度比L / t（L：完全螺纹 销的长度，t：销原料管部的壁厚）为4.0以下。
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公开(公告)号：US10711533B2
公开(公告)日：2020-07-14
申请号：US15561778
申请日：2016-03-28
发明人： Masaki Yoshikawa , Kazunari Takahashi , Taro Kanayama , Jun Takano , Takamasa Kawai , Tsuyoshi Yoneyama
IPC分类号： E21B17/042 , E21B17/08 , F16L15/04
摘要： A threaded pipe joint, when acted upon by a tensile load, does not break on the female thread-side of a first thread section of a second thread series that extends from an intermediate shoulder. The threaded pipe joint reliably undergoes tensile rupture on the female thread-side of a first thread section of a first thread series, which is the original critical cross-section site. The threaded pipe joint is configured so that when the male and female threads of the intermediate shoulder are screwed together, the load flank-side thread gaps L1G and L2G of a first thread series, which is the radially inward thread series, and a second thread series, which is the radially outward thread series, on the two sides of the intermediate shoulder always satisfy the relationship L1G
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