JP2005256885A - Oil well pipe screw joint - Google Patents
Oil well pipe screw joint Download PDFInfo
- Publication number
- JP2005256885A JP2005256885A JP2004066841A JP2004066841A JP2005256885A JP 2005256885 A JP2005256885 A JP 2005256885A JP 2004066841 A JP2004066841 A JP 2004066841A JP 2004066841 A JP2004066841 A JP 2004066841A JP 2005256885 A JP2005256885 A JP 2005256885A
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- JP
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- Prior art keywords
- oil well
- well pipe
- threaded joint
- inner peripheral
- peripheral surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
Description
本発明は、油井管同士を接続する油井管ねじ継手に関する。 The present invention relates to an oil well pipe threaded joint for connecting oil well pipes to each other.
近時、石油掘削の深度はますます深くなりつつあり、油井管の長さが長くなる傾向にある。油井管は、継手によって接続しながら吊下する。長さの長い油井管では、吊り下げ荷重が大きくなり、また各種の原因による衝撃荷重等を避けることは出来ないので、油井管の上部管では、肉厚の大きい管を使用する必要が生じている。 Recently, the depth of oil drilling has been increasing, and the length of the oil well pipe tends to be longer. The oil well pipe is suspended while being connected by a joint. With long oil well pipes, the suspension load becomes large, and impact loads due to various causes cannot be avoided. Therefore, it is necessary to use a thick pipe for the upper pipe of the oil well pipe. Yes.
一方、油井管の継手は、一般に、ねじ継手が用いられ、継手のシール性を重視する油井管では、継手の中央にシールショルダを設けることがある。従来、ねじ継手の中央に設けるシールショルダは、上下の油井管の内径に差がないので、同一の内径に形成されている(例えば、特許文献1参照。)
このような従来のねじ継手では、接続する油井管の内径が異なる場合に、肉厚で内径の小さい管に隣接する部分では、油井管の内径とねじ継手のシールショルダ部の内径に段差を生ずる。このような段差は油井管内を通る流体に対して大きな流動抵抗となるという問題がある。
In such a conventional threaded joint, when the inner diameter of the connected oil well pipe is different, a step is formed between the inner diameter of the oil well pipe and the inner diameter of the seal shoulder portion of the threaded joint in a portion adjacent to the wall having a small wall thickness. . Such a level | step difference has a problem that it becomes a big flow resistance with respect to the fluid which passes the inside of an oil well pipe.
本発明は上記問題点を解決し、油井管内部の流体の流動抵抗を少なくした油井管ねじ継手を提供することを目的とするものである。 An object of the present invention is to solve the above problems and to provide an oil well pipe threaded joint in which the flow resistance of fluid inside the oil well pipe is reduced.
本発明は、上記問題点を解決するためになされたもので、次の技術手段を講じたことを特徴とする油井管ねじ継手である。すなわち、本発明は、内径の異なる油井管を接続する油井管ねじ継手において、接続する油井管の端部に当接するシールショルダ部を設け、該シールショルダ部の内周面を、油井管に当接する部分が接続すべき油井管のそれぞれの内周面に一致し中間部が円滑に変化する面に形成したことを特徴とする油井管ねじ継手である。 The present invention has been made to solve the above problems, and is an oil well pipe threaded joint characterized by taking the following technical means. That is, according to the present invention, in an oil well pipe threaded joint for connecting oil well pipes having different inner diameters, a seal shoulder portion that abuts against an end portion of the oil well pipe to be connected is provided, and the inner peripheral surface of the seal shoulder portion is applied to the oil well pipe. The oil well pipe threaded joint is characterized in that the contacting portion is formed on a surface that smoothly matches the inner peripheral surface of the oil well pipe to be connected and the intermediate portion changes smoothly.
本発明のねじ継手は、接続する油井管の端部の雄ねじに螺合する雌ねじを両端に有し、その中間部に油井管の端部に当接するシールショルダ部を備えている。このシールショルダ部の端部の内周面を油井管のそれぞれの内周面に一致させ、その中間部をなめらかな曲面で連結した形状に成形する。このことにより、油井管の内面とシールショルダの内周面に段差がなくなり、油井管内を通る流体抵抗が著しく小さくなる。 The threaded joint according to the present invention has female threads that are engaged with male threads at the end of an oil well pipe to be connected at both ends, and a seal shoulder portion that is in contact with the end of the oil well pipe at an intermediate portion thereof. The inner peripheral surface of the end portion of the seal shoulder portion is made to coincide with each inner peripheral surface of the oil well pipe, and the intermediate portion is formed into a shape connected by a smooth curved surface. As a result, there is no step between the inner surface of the oil well pipe and the inner peripheral surface of the seal shoulder, and the fluid resistance passing through the oil well pipe is significantly reduced.
本発明の油井管ねじ継手は以上のように構成されているので、油井管の内周面とシールショルダの内周面に段差がなくなり、油井管内を通る流体抵抗が著しく小さくなるという優れた効果を奏する。 Since the oil well pipe threaded joint of the present invention is configured as described above, there is no step between the inner peripheral surface of the oil well pipe and the inner peripheral surface of the seal shoulder, and the excellent effect that the fluid resistance passing through the oil well pipe is significantly reduced. Play.
本発明は、シールショルダ部の内周面を内径の異なる上下の油井管の各内周面と面一になるように形成した油井管ねじ継手である。このような油井管ねじ継手は、、ショルダの内周面をなめらかな異径面に機械加工することにより製造することができる。この油井管ねじ継手では油井管の内部を流動する流体の流動抵抗がシールショルダと油井管内面との段差部で大きくなるのを防止し、流動抵抗を減少させる。 The present invention is an oil well pipe threaded joint formed so that the inner peripheral surface of a seal shoulder portion is flush with the inner peripheral surfaces of upper and lower oil well pipes having different inner diameters. Such an oil well pipe threaded joint can be manufactured by machining the inner peripheral surface of the shoulder into a smooth different diameter surface. In this oil well pipe threaded joint, the flow resistance of the fluid flowing inside the oil well pipe is prevented from increasing at the step portion between the seal shoulder and the oil well pipe inner surface, and the flow resistance is reduced.
以下図面を参照して本発明の実施の形態を説明する。 Embodiments of the present invention will be described below with reference to the drawings.
図2は上側の油井管21の下端雄ねじ部と、下側の油井管22の上端雄ねじ部とを油井管ねじ継手10の雌ねじに螺合することによって上側の油井管21と下側の油井管22とを結合した結合部の断面図を示すものである。通常は、下側の油井管22と油井管ねじ継手10とは予め所定のトルクで組み合わされており、上側の油井管21を現場でねじ込む。油井管ねじ継手10は、上下の油井管21、22と螺合する雌ねじを備え、中間部にシールショルダ11を備えている。シールショルダ11の上下端面には、油井管21、22の端部の丸み23、24と密に接する凹部15、16を有し、油井管21、22をこの油井管ねじ継手10を介して結合したとき、この丸み23、24と凹部15、16とが緊密にシール部を構成するように形成されている。
FIG. 2 shows that an upper
図3は、従来のシールショルダ11の拡大図を示す断面図である。シールショルダ11の内周面13は一様な直径を有し、上側の肉厚の油井管21の内径と段差14がある。この段差14は半径での差異寸法である。
FIG. 3 is a cross-sectional view showing an enlarged view of the
図1は本発明の実施例の油井管ねじ継手10を示す断面図である。この油井管ねじ継手10のシールショルダ11の内周面12は、上側の肉厚の油井管21の内周面25と面一になっており、下側の通常の肉厚の油井管22の内周面26と面一になっている。そして中間部はなめらかな曲面となっており、油井管内を流れる流体は、流動抵抗の小さい円滑な流動となる。
FIG. 1 is a sectional view showing an oil well pipe threaded
10 ねじ継手
11 シールショルダ
12 内周面
13 内周面
14 段差(半径寸法の差異)
15、16 丸み
21 上側の油井管
22 下側の油井管
23、24 凹部
25、26 内周面
DESCRIPTION OF
15, 16
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004066841A JP2005256885A (en) | 2004-03-10 | 2004-03-10 | Oil well pipe screw joint |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004066841A JP2005256885A (en) | 2004-03-10 | 2004-03-10 | Oil well pipe screw joint |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2005256885A true JP2005256885A (en) | 2005-09-22 |
Family
ID=35082822
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2004066841A Withdrawn JP2005256885A (en) | 2004-03-10 | 2004-03-10 | Oil well pipe screw joint |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2005256885A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103946617A (en) * | 2011-11-18 | 2014-07-23 | 新日铁住金株式会社 | Tubular threaded joint having improved high torque performance |
CN104870877A (en) * | 2012-12-21 | 2015-08-26 | 瓦卢瑞克石油天然气法国有限公司 | Assembly for producing a galling-resistant threaded tubular connection |
-
2004
- 2004-03-10 JP JP2004066841A patent/JP2005256885A/en not_active Withdrawn
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103946617A (en) * | 2011-11-18 | 2014-07-23 | 新日铁住金株式会社 | Tubular threaded joint having improved high torque performance |
CN104870877A (en) * | 2012-12-21 | 2015-08-26 | 瓦卢瑞克石油天然气法国有限公司 | Assembly for producing a galling-resistant threaded tubular connection |
US9863190B2 (en) | 2012-12-21 | 2018-01-09 | Vallourec Oil And Gas France | Assembly for producing a galling-resistant threaded tubular connection |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20070605 |