Screw-threaded joint for steel pipe

一种螺纹接头、钢管的技术，应用在螺纹连接、管子/管接头/管件、钻管等方向，能够解决无法修正、损伤外套接箍的密封面危险性等问题，达到保持气密性、避免局部显著损伤、刚性高的效果

Active Publication Date: 2010-11-10
NIPPON STEEL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] In addition, since the head of the front end of the inner sleeve is long, the insertion angle when inserting the inner sleeve deviates, and there is a risk of damaging the sealing surface of the outer collar.
In addition, if the outer peripheral surface of the front end of the inner sleeve is substantially cylindrical, if the axis of the inner sleeve deviates from the axis of the outer collar, the deviation cannot be corrected by guiding the insertion direction of the inner sleeve.

Method used

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  • Screw-threaded joint for steel pipe
  • Screw-threaded joint for steel pipe
  • Screw-threaded joint for steel pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0044] Below, while referring to the attached Figure 1 Embodiments of the threaded joint for steel pipes according to the present invention will be described.

[0045] image 3 (A) is a schematic axial cross-sectional view of a portion close to the front end of the inner sleeve of one embodiment of the threaded joint for steel pipes of the present invention.

[0046] The threaded joint consists of an inner casing 1 and an outer collar 2, and is a high-grade joint type joint. From the inner side toward the front end of the inner casing, the inner casing 1 has an external thread 11, a sealing surface 13 and an end shoulder surface 14 in sequence, and the outer collar 2 has an external thread, a sealing surface and an end surface of the inner casing respectively in turn. The internal thread 21 , the sealing surface 23 and the shoulder surface 24 correspond to the shoulder surface (that is, engage, interfere or abut against the external thread, the sealing surface and the shoul...

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PUM

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Abstract

A screw-threaded joint for a steel pipe includes a pin (1) and a box (2). The pin (1) has a tapered male screw thread (11), a tapered seal surface (13), and an end shoulder surface (14), while the box (2) has, in a corresponding manner, a tapered female screw thread (21), a tapered seal surface (23), and a shoulder surface (24). The pin (1) and the box (2) can be easily fastened together, and the screw-threaded joint has improved tightness at seal surfaces. The pin and the box have a contactless region (B) between the seal surfaces (13, 23) and the shoulder surfaces (14, 24), and the peripheral surfaces of the pin and the box do not make contact with each other in the contactless region (B). At least that portion of pin which is in the contactless region and adjacent the front end of the pin is a tapered surface portion (18) having substantially the same inclination angle as the tapered seal surface (13). Also, that portion of the box which is in the contactless region is substantially a circular cylindrical surface.

Description

technical field [0001] The invention relates to a threaded joint for connecting steel pipes such as oil country tubular goods (OCTG), riser pipes and pipelines, which are generally used in the detection and production of oil wells and gas wells. More specifically, the present invention relates to a threaded joint for steel pipes that has a sealing surface and a shoulder surface in addition to a threaded portion and is excellent in pressure-resistant sealing properties. Background technique [0002] Threaded joints for steel pipes are widely used in the connection between steel pipes used in oil production industrial equipment such as oil well pipes and standpipes. The sleeve is composed of an outer collar as an internal thread member provided at the end of the second tubular member, and is connected by fitting of an external thread and an internal thread, both of which are tapered threads. [0003] As a typical structure, the first tubular member is a pipe such as an oil co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L15/04
CPCF16L15/004E21B17/042F16L15/00
Inventor 高野隆宽永作重夫杉野正明滨本贵洋山口优
Owner NIPPON STEEL CORP
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