公开(公告)号：US11905765B2

公开(公告)日：2024-02-20

申请号：US17757722

申请日：2020-09-11

Applicant: JFE STEEL CORPORATION

Inventor： Jun Takano ,  Takamasa Kawai ,  Takuya Nagahama ,  Seigo Goto ,  Masaki Yoshikawa ,  Tsuyoshi Yoneyama

IPC: F16L15/06 ,  E21B17/042 ,  F16L15/00

CPC classification number: E21B17/042 ,  F16L15/001 ,  F16L15/06

Abstract: 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.

公开(公告)号：US11053749B2

公开(公告)日：2021-07-06

申请号：US16328006

申请日：2017-09-13

Applicant: JFE Steel Corporation

Inventor： Takamasa Kawai ,  Taro Kanayama ,  Masaki Yoshikawa ,  Jun Takano ,  Takuya Nagahama

IPC: F16L15/00 ,  E21B17/08 ,  F16L15/04 ,  E21B17/042

Abstract: 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(%).

公开(公告)号：US10295091B2

公开(公告)日：2019-05-21

申请号：US15111544

申请日：2014-12-18

Applicant: JFE Steel Corporation

Inventor： Masaki Yoshikawa ,  Hiroshi Chikatsune ,  Kazunari Takahashi ,  Takuya Nagahama ,  Jun Takano ,  Masateru Ueta ,  Takamasa Kawai

IPC: F16L25/00 ,  F16L15/00 ,  E21B17/042 ,  F16L15/06

Abstract: 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.

公开(公告)号：US20190056049A1

公开(公告)日：2019-02-21

申请号：US16077912

申请日：2016-12-16

Applicant: JFE Steel Corporation

Inventor： Takamasa Kawai ,  Taro Kanayama ,  Masaki Yoshikawa ,  Haruhiko Seki ,  Masateru Ueta ,  Jun Takano ,  Tsuyoshi Yoneyama

IPC: F16L15/04

Abstract: 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.

公开(公告)号：US20160319966A1

公开(公告)日：2016-11-03

申请号：US15108856

申请日：2014-10-30

Applicant: JFE STEEL CORPORATION

Inventor： Takamasa Kawai ,  Kazunari Takahashi ,  Hiroshi Chikatsune ,  Masaki Yoshikawa ,  Jun Takano ,  Takuya Nagahama ,  Masateru Ueta ,  Tsuyoshi Yoneyama ,  Hideo Sato ,  Haruhiko Seki

IPC: F16L15/04 ,  F16L15/06 ,  E21B17/042 ,  F16L15/00

CPC classification number: F16L15/04 ,  E21B17/042 ,  F16L15/004 ,  F16L15/06

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US10125554B2

公开(公告)日：2018-11-13

申请号：US14897802

申请日：2014-06-09

Applicant: JFE STEEL CORPORATION

Inventor： Takamasa Kawai ,  Kazunari Takahashi ,  Hiroshi Chikatsune ,  Masaki Yoshikawa ,  Jun Takano ,  Takuya Nagahama ,  Masateru Ueta ,  Hideo Sato ,  Haruhiko Seki ,  Tsuyoshi Yoneyama

IPC: F16L15/06 ,  E21B17/042 ,  F16L15/00

Abstract: In a joint for oil country tubular goods, a pitch change is made such that an internally-thread pitch has the same value as an externally-thread pitch from a thread end portion on a box end side to a pitch change position taken on a box center side with respect to a position away from the thread end portion by ½ of an entire length of the threaded portion, and the internally-thread pitch is changed to a value less than the externally-thread pitch at the pitch change position so that a thread gap is gradually decreased from the pitch change position to a position of the thread end portion on the box center side, and the thread gap is eventually set to a value which is 0.2 to 0.8 times as large as the thread gap before the pitch change is made.

公开(公告)号：US09982491B2

公开(公告)日：2018-05-29

申请号：US14896754

申请日：2014-06-09

Applicant: JFE Steel Corporation

Inventor： Takamasa Kawai ,  Kazunari Takahashi ,  Hiroshi Chikatsune ,  Masaki Yoshikawa ,  Jun Takano ,  Takuya Nagahama ,  Masateru Ueta

IPC: E21B17/042 ,  F16B33/02 ,  F16L15/00 ,  F16L15/06

CPC classification number: E21B17/042 ,  F16B33/02 ,  F16L15/004 ,  F16L15/06

Abstract: A threaded joint for an oil country tubular goods includes pins each of which occupies a pipe end portion of a steel pipe for an oil country tubular goods, and includes an externally-threaded portion, a nose extending toward a pipe end side from the externally-threaded portion, and a shoulder forming a distal end of the nose; and a box including internally-threaded portions each forming a threaded portion by being threadedly joined with the externally-threaded portion, and shoulders brought into contact with the shoulders of the pins, wherein the pins and the box being joined to each other by the threaded joining so that portions between the threaded portions and the shoulders are brought into metal-to-metal contact with each other to thereby form seal portions at the contact portions, and the shoulders of the pins and the shoulders of the box forming shoulder faces are brought into contact with each other at the time of make-up of the threaded joint, and a ratio of a chamfer length of pin thread to a thread pitch is 1.0 or more to 3.0 or less.

公开(公告)号：US09709196B2

公开(公告)日：2017-07-18

申请号：US15108856

申请日：2014-10-30

Applicant: JFE Steel Corporation

Inventor： Takamasa Kawai ,  Kazunari Takahashi ,  Hiroshi Chikatsune ,  Masaki Yoshikawa ,  Jun Takano ,  Takuya Nagahama ,  Masateru Ueta ,  Tsuyoshi Yoneyama ,  Hideo Sato ,  Haruhiko Seki

IPC: F16L25/00 ,  F16L15/04 ,  F16L15/00 ,  F16L15/06 ,  E21B17/042

CPC classification number: F16L15/04 ,  E21B17/042 ,  F16L15/004 ,  F16L15/06

Abstract: 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.

公开(公告)号：US20160130884A1

公开(公告)日：2016-05-12

申请号：US14897802

申请日：2014-06-09

Applicant: JFE STEEL CORPORATION

Inventor： Takamasa Kawai ,  Kazunari Takahashi ,  Hiroshi Chikatsune ,  Masaki Yoshikawa ,  Jun Takano ,  Takuya Nagahama ,  Masateru Ueta ,  Hideo Sato ,  Haruhiko Seki ,  Tsuyoshi Yoneyama

IPC: E21B17/042 ,  F16L15/06

CPC classification number: E21B17/042 ,  F16L15/004 ,  F16L15/06

Abstract: In a joint for oil country tubular goods, a pitch change is made such that an internally-thread pitch has the same value as an externally-thread pitch from a thread end portion on a box end side to a pitch change position taken on a box center side with respect to a position away from the thread end portion by ½ of an entire length of the threaded portion, and the internally-thread pitch is changed to a value less than the externally-thread pitch at the pitch change position so that a thread gap is gradually decreased from the pitch change position to a position of the thread end portion on the box center side, and the thread gap is eventually set to a value which is 0.2 to 0.8 times as large as the thread gap before the pitch change is made.

Abstract translation: 在用于油井管状物品的接头中，进行间距改变，使得内螺纹节距具有与从箱端侧的螺纹端​​部到盒子上的间距变化位置的外螺纹间距相同的值 中心侧相对于远离螺纹端部的位置的螺纹部分的整个长度的1/2，并且内螺纹节距改变为小于在间距变化位置处的外螺纹间距的值，使得 螺纹间隙从间距变化位置逐渐减小到箱体中心侧的螺纹端​​部的位置，螺纹间隙最终设定为间距变化前的螺纹间隙的0.2〜0.8倍的值 是做的

公开(公告)号：US12110992B2

公开(公告)日：2024-10-08

申请号：US18044990

申请日：2020-09-30

Applicant: JFE STEEL CORPORATION

Inventor： Masaki Yoshikawa ,  Seigo Goto ,  Seiji Ozaki ,  Hideo Sato

IPC: F16L15/04 ,  F16L15/06

CPC classification number: F16L15/04 ,  F16L15/06

Abstract: A threaded joint wherein a relationship between shoulder angle parameters and thread taper angle parameters for a coupling and a pair of pins inserted from both ends of the coupling is defined by the following expression (1), and a tightening torque with which the threaded joint is tightened is 60% or more and 85% or less of a yield torque determined by the following expression (2):










-
1.5

⁢
°

≤


Δ
⁢
θ

-

Δ
⁢
ω


≤

2.
°


,




(
1
)












T
=


(


T
S

+

T
D


)

⁢

1
12







(
2
)











T
S

=


f
t

⁢

P
c

⁢


E
7

2

⁢

(

2
⁢
π
⁢


E


7


)

⁢

L
4

⁢

1
2









P
c

=

E
⁢


ρ
m

2

⁢



(



(

W
2

)

2

-


(


E
7

2

)

2


)

⁢

(



(


E
7

2

)

2

-


(

d
2

)

2


)



2
⁢


(


E
7

2

)

3

⁢

(



(

W
2

)

2

-


(

d
2

)

2


)











T
D

=


Y
m

⁢



A
S

(


P

2
⁢
π


+



R
t

⁢

f
s



cos
⁢
Θ


+


R
s

⁢

f
s



)

.