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公开(公告)号：US20210025523A1
公开(公告)日：2021-01-28
申请号：US16977835
申请日：2019-02-14
发明人： Takamasa KAWAI , Masaki YOSHIKAWA , Jun TAKANO , Takuya NAGAHAMA , Haruhiko SEKI
IPC分类号： F16L15/00 , E21B17/042
摘要： A screw joint in which an efficient screw length of a joint portion is achieved. This screw joint is for an oil well pipe of an integral type and includes: (i) a pin that is provided with a male screw portion which is a male taper screw, at one end of a steel pipe; and (ii) a box that is provided with a female screw portion which is a female taper screw fitted to the male screw portion, at one end of the steel pipe, in which a structure, in which the pin and the box are in metal contact with each other to seal a fluid, is provided at least at one place of a seal portion on an outer peripheral surface side of a pipe end side of the pin and a seal portion on an inner peripheral surface side of a pipe end side of the box
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公开(公告)号：US20230044251A1
公开(公告)日：2023-02-09
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： E21B17/042 , F16L15/00 , 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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