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Process for producing high-precision special threaded sleeve pipe coupling

A special thread and casing coupling technology, applied in the direction of threaded connection, casing, manufacturing tools, etc., can solve the problems of large deviation of casing coupling wall thickness, low equipment investment, poor sealing performance, etc. The effect of high threaded connection strength and large performance differences

Inactive Publication Date: 2011-09-28
ANHUI TIANDA OIL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The special threaded casing collar processed and manufactured by the method of the present invention has high precision, solves the problems of large wall thickness deviation, low strength, and poor sealing performance of the casing collar, and has less equipment investment and low cost

Method used

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  • Process for producing high-precision special threaded sleeve pipe coupling
  • Process for producing high-precision special threaded sleeve pipe coupling

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Experimental program
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Effect test

Embodiment Construction

[0029] A method for manufacturing high-precision special threaded casing couplings,

[0030] Material: round tube billet

[0031] The alloy composition and content percentage of the round tube billet are:

[0032] C0.34-0.40%, Si0.20-0.50%, Mn1.30-1.55%, P≤0.020%, S≤0.010%, Cu≤0.20%, Ni≤0.20%, Cr≤0.50%, Mo≤0.30% , V≤0.10%, Ti≤0.10%, B0.0001-0.0003%, and the balance is Fe.

[0033] The specific processing steps are as follows:

[0034] (1) round tube billet heating

[0035] The round tube is heated in a regenerative annular heating furnace. During heating, the tube and the furnace bottom rotate together. The heating temperature is 1210±10°C, and the heating time is 55-65°C. The temperature difference between the ends of the tube is not greater than ±10°C. ;

[0036] (2) perforation

[0037] The heated round tube is pierced with a three-roller piercer. After piercing, it is in the shape of a capillary tube. The rolling angle is 15°±2°, the maximum elongation coefficient is...

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Abstract

The invention provides a process for producing a high-precision special threaded sleeve pipe coupling. The method specifically comprises the following steps of: heating a circular pipe blank; perforating; sawing off; carrying out heat treatment; carrying out finish turning; and carrying out thread machining. The special threaded sleeve pipe coupling which is produced by the process provided by the invention has high precision; and the process solves the problems of large deflection of the wall thickness of the threaded sleeve pipe coupling, low strength and poor sealing performance and the like, and also has the advantages of less investment on the equipment and low cost.

Description

technical field [0001] The invention relates to the field of threaded casing collar processing, in particular to a method for manufacturing a high-precision special threaded casing collar. Background technique [0002] With the development of the petroleum industry, a large number of deep wells and ultra-deep wells appear in oilfield development and production, and the geological conditions and operating environment are more complex and harsh. Ordinary oil casing couplings have large wall thickness deviations and high production costs. The traditional threaded connection has low connection strength and poor sealing performance. It can no longer adapt to the requirements of deep wells and ultra-deep wells in special environments. Contents of the invention [0003] In order to overcome the deficiencies of the prior art, the invention provides a method for manufacturing a special threaded casing collar. The special thread casing collar processed and manufactured by the met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/08F16L15/06C22C38/58C22C38/54C21D9/00C21D1/18
Inventor 张胡明雍金贵吕黎红
Owner ANHUI TIANDA OIL PIPE
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