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公开(公告)号：US11719365B2
公开(公告)日：2023-08-08
申请号：US17595734
申请日：2020-08-20
发明人： Yousuke Oku , Sadao Douchi
IPC分类号： F16L15/06 , E21B17/042
CPC分类号： F16L15/06 , E21B17/042
摘要： A threaded connection for large diameter steel pipe exhibits high torque resistance and high sealability and, at the same time, provides a shear resistance that suits the size of the steel pipe to be connected. The threaded connection includes a tubular pin provided on a tip of a steel pipe with large diameter, and a tubular box 20 adapted to be drawn up on the pin as the pin is screwed in. The pin includes a male threadform made with a taper thread. The box includes a female threadform made with a taper thread. Each of the threadforms are wedge threads and have a dovetail-shaped cross section. The male threadform is designed such that the width of the thread in an end region of the male threadform closer to the tip is set to a size corresponding to the size of the pipe body of the steel pipe.
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公开(公告)号：US20210156204A1
公开(公告)日：2021-05-27
申请号：US16612608
申请日：2018-04-11
发明人： Satoshi Maruta , Yousuke Oku , Tadashi Nakamura
IPC分类号： E21B17/042
摘要： A threaded connection includes a pin and a box. The pin includes, in the order from a free end side of the pin toward a tubular body side thereof, an inner sealing surface, an inner male threaded portion, a shoulder portion, an outer male threaded portion, and an outer sealing surface. The box includes, in the order from a tubular body side of the box toward a free end side thereof, an inner sealing surface, an inner female threaded portion, a shoulder portion, an outer female threaded portion, and an outer sealing surface. Between the inner sealing surface and the inner female threaded portion of the box, an inner groove along a circumferential direction is provided, and some threads of the inner male threaded portion of the pin are contained in the inner groove.
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公开(公告)号：US11143337B2
公开(公告)日：2021-10-12
申请号：US16647215
申请日：2018-11-06
发明人： Yousuke Oku , Masaaki Sugino
IPC分类号： F16L15/00
摘要： A threaded connection for steel pipe with improved sealability against the internal and external pressures is provided. A threaded connection 1 includes a pin 10 and a box 20. The pin 10 includes a male thread 11, a nose 12, a pin shoulder surface 13, and a pin sealing surface 14. The box 20 includes a female thread 21, a box shoulder surface 23, and a box sealing surface 24. The box sealing surface 24 has a seal point SP on the taper surface 242 located at the midpoint thereof as determined along the direction of the pipe axis CL. The distance LSP between the tip of the nose 12 and the seal point SP as measured in the direction of pipe axis CL is 13 mm or larger. The shoulder angle α between the pin or box shoulder surface 13 or 23 and a plane VP perpendicular to the pipe axis CL is 2 to 13 degrees. The ratio TB/TP of the wall thickness TB of the box to the wall thickness TP of the pin 10 as measured at the seal point SP is 1.7 or higher.
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公开(公告)号：US11933431B2
公开(公告)日：2024-03-19
申请号：US17427256
申请日：2020-02-07
发明人： Kazuya Ishii , Kunio Goto , Masaaki Sugino , Yousuke Oku
摘要： A threaded connection for pipes includes a pin, a box, a shoulder part plating layer, and a non-shoulder part plating layer. The shoulder part plating layer has an outermost layer formed of a high friction coefficient plating layer, and is arranged on a pin side shoulder part and/or a box side shoulder part. The non-shoulder part plating layer has an outermost layer formed of a low friction coefficient plating layer having a coefficient of friction lower than a coefficient of friction of the high friction coefficient plating layer, and the non-shoulder part plating layer is arranged on at least one of a pin side thread part, a pin side metal seal part, a box side thread part, and a box side metal seal part.
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公开(公告)号：US11828391B2
公开(公告)日：2023-11-28
申请号：US17596391
申请日：2020-08-20
发明人： Yousuke Oku , Satoshi Maruta , Masaaki Sugino , Alan Fothergill
IPC分类号： F16L15/00 , E21B17/042
CPC分类号： F16L15/007 , E21B17/042
摘要： In a threaded connection of a two-step thread construction including intermediate shoulder surfaces, a break is prevented near the intermediate critical cross sections upon application of a tensile load, and the intermediate shoulder surfaces are easier to create, thus improving productivity. The outer periphery portion of a pin located between an intermediate shoulder surface of the pin and a second male thread is provided with a circumferential groove including a curved surface smoothly contiguous to the intermediate shoulder surface, thereby mitigating plastic strains generated near the pin intermediate critical cross section PICCS. The inner periphery portion of a box located between an intermediate shoulder surface of the box and a first female thread is provided with a circumferential groove including a curved surface smoothly contiguous to the intermediate shoulder surface, thereby mitigating plastic strains generated near a box intermediate critical cross section BICCS.
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公开(公告)号：US11015746B2
公开(公告)日：2021-05-25
申请号：US16469695
申请日：2018-01-17
发明人： Satoshi Maruta , Yousuke Oku
摘要： A threaded connection that provides high sealing performance is provided. A threaded connection (10) includes a pin (1) and a box (2). An inner male thread (13) of the pin (1) includes a parallel portion (131). The parallel portion (131) is located at an end portion of the inner male thread (13) adjacent to the pin inner sealing surface (11), and has thread roots parallel to the pipe axis. An inner female thread (23) of the box (2) includes a tapered portion (231). The thread height in the tapered portion (231) is larger than that in the parallel portion (131). Da
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公开(公告)号：US12007045B2
公开(公告)日：2024-06-11
申请号：US17754227
申请日：2020-12-22
发明人： Satoshi Maruta , Yousuke Oku
IPC分类号： F16L15/00
CPC分类号： F16L15/007
摘要： In a threaded connection for pipe with a two-step thread construction, including intermediate shoulders, during stabbing, the internal-pressure sealing surface of the pin near its tip is prevented from contacting the intermediate shoulder of the box and thus receiving damage. LP, LB, hP and hB shown in FIG. 2 satisfy Expressions (1) and (2), provided below. θseal is the angle of slope of the straight line connecting the two ends, as determined along the axial direction, of the internal-pressure sealing surface of the pin. Expression (3), provided below, is also satisfied.
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公开(公告)号：US11629560B2
公开(公告)日：2023-04-18
申请号：US16465662
申请日：2017-12-27
发明人： Yousuke Oku , Masaaki Sugino
IPC分类号： F16L15/04 , E21B17/042 , F16L15/00 , F16L15/06 , F16L58/18
摘要： A threaded connection for steel pipe with improved sealing performance is provided. A threaded connection (1) includes a pin (10) and a box (20). The pin (10) includes a pin shoulder surface (11), a pin sealing surface (12) and a male thread (13). The box (20) includes a box shoulder surface (21), a box sealing surface (22) and a female thread (23). The male thread (13) and female thread (23) are constituted by wedge threads. When the connection has been made up, the pin shoulder surface (11) is in contact with the box shoulder surface (21), the stabbing flank and load flank of the male thread (13) are in contact with the stabbing flank and load flank, respectively, of the female thread (23), and the pin sealing surface (12) is in contact with the box sealing surface (22). The shoulder angle is 4° or larger. The shoulder angle is the angle formed by each of the shoulder surfaces (11, 21) with a plane perpendicular to the pipe axis (CL) when the connection is not made up.
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公开(公告)号：US11608692B2
公开(公告)日：2023-03-21
申请号：US16612608
申请日：2018-04-11
发明人： Satoshi Maruta , Yousuke Oku , Tadashi Nakamura
IPC分类号： E21B17/042 , F16L15/04 , F16L15/00
摘要： A threaded connection includes a pin and a box. The pin includes, in the order from a free end side of the pin toward a tubular body side thereof, an inner sealing surface, an inner male threaded portion, a shoulder portion, an outer male threaded portion, and an outer sealing surface. The box includes, in the order from a tubular body side of the box toward a free end side thereof, an inner sealing surface, an inner female threaded portion, a shoulder portion, an outer female threaded portion, and an outer sealing surface. Between the inner sealing surface and the inner female threaded portion of the box, an inner groove along a circumferential direction is provided, and some threads of the inner male threaded portion of the pin are contained in the inner groove.
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公开(公告)号：US20200278056A1
公开(公告)日：2020-09-03
申请号：US16647215
申请日：2018-11-06
发明人： Yousuke Oku , Masaaki Sugino
IPC分类号： F16L15/00
摘要： A threaded connection for steel pipe with improved sealability against the internal and external pressures is provided. A threaded connection 1 includes a pin 10 and a box 20. The pin 10 includes a male thread 11, a nose 12, a pin shoulder surface 13, and a pin sealing surface 14. The box 20 includes a female thread 21, a box shoulder surface 23, and a box sealing surface 24. The box sealing surface 24 has a seal point SP on the taper surface 242 located at the midpoint thereof as determined along the direction of the pipe axis CL. The distance LSP between the tip of the nose 12 and the seal point SP as measured in the direction of pipe axis CL is 13 mm or larger. The shoulder angle α between the pin or box shoulder surface 13 or 23 and a plane VP perpendicular to the pipe axis CL is 2 to 13 degrees. The ratio TB/TP of the wall thickness TB of the box to the wall thickness TP of the pin 10 as measured at the seal point SP is 1.7 or higher.
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