Pipe screw coupling

A technology for threaded joints and pipes, applied in the direction of threaded connections, pipes/pipe joints/pipes, drill pipes, etc., can solve problems such as mechanical damage of the threaded part, and achieve the effect of improving mechanical damage resistance

Active Publication Date: 2012-01-11
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the clearance is too small, it is easy to cause mechanical damage to the threaded part, so it is necessary to form an appropriate clearance.

Method used

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  • Pipe screw coupling
  • Pipe screw coupling
  • Pipe screw coupling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0071] As an example of the invention, evaluation was performed on a threaded joint for pipes according to the present invention, which is shown in FIG. 1(a) or in which any two arcs of the compound arc curve in FIG. 1(a) are connected via a line segment. . Table 1 and Table 2 show the dimensions, shapes and evaluation results of Examples of the present invention and Comparative Examples. The pin member is formed at the tip of a steel pipe with an outer diameter of 244.48 mm and a wall thickness of 13.84 mm. Also, the thread is formed with 5TPI (five threads per inch). As an evaluation based on FEM analysis, a leak test based on ISO13679:2002 was simulated, and the contact surface pressure (ksi·inch) at the sealed part of the test was evaluated. In addition, the contact surface pressure is calculated by integrating the contact surface pressure in the seal contact area. For this leak test, a pipe threaded joint is subjected to a biaxial stress corresponding to 95% of the yie...

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PUM

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Abstract

Disclosed is a pipe screw coupling that has increased sealing properties, compression resistance, and galling resistance. Specifically, the pin nose outer peripheral surface (30) forms a convex curve on the outside thereof in a cross section in the axial direction. Said convex curve has a curved shape wherein a compound-R curve (N) comprising a plurality of outwardly convex arcs that are connected in sequence and that have radii of curvature (R) that differ from each other at the generating line of a cylindrical section that is adjacent to a male screw section (5) is such that the radii of curvature (R) of the arcs increase with distance from the male screw section (5) and the line tangent to the connection point of an arc is the same as that of the arc connected to. The inner peripheral surface relative to the pin nose (30) of a box member (1) has a tapered surface (20) that interferes with the pin nose outer peripheral surface (30) when connecting with the pin member (3).

Description

technical field [0001] The present invention relates to threaded joints for pipes, in particular, to OCTG (oil special tubing) and standpipes that are generally used in the exploration and production of oil wells and gas wells, including tubing and shells. A threaded joint for pipes with excellent airtightness and compression resistance for connecting pipes such as riser pipes and line pipes. Background technique [0002] Threaded joints are widely used in the connection of steel pipes used in the production of oil and gas, such as oil well pipes. Conventionally, standard threaded joints prescribed by API (American Petroleum Institute: American Petroleum Institute) standards have been used to connect steel pipes used in oil and gas exploration and production. However, in recent years, crude oil and natural gas wells have gradually become deeper, horizontal wells and inclined wells have been added from vertical wells, and the excavation / production environment has become hars...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L15/04
CPCF16L15/00F16L15/06F16L15/04E21B17/042F16L15/004
Inventor 园部治长滨拓也吉川正树高野顺川井孝将高桥一成
Owner JFE STEEL CORP
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