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13 Cr oil well-pipe test material object preparation method

An oil well pipe and physical technology, which is applied in the field of 13Cr oil well pipe test physical preparation, to achieve the effect of shortening the test period, improving technical ability and ensuring quality

Active Publication Date: 2008-03-26
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of connection between 13Cr stainless steel material and 35CrMo or 30CrMo material by using welding process, so as to ensure that the welded joint will not leak or break during high temperature, high pressure pressure test and axial tension or compression test

Method used

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  • 13 Cr oil well-pipe test material object preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] There are two kinds of materials to be welded in the present invention, one is 13Cr stainless steel oil well pipe, and the other is a 35CrMo or similar material chuck used in the test for high pressure sealing test, the chuck also acts as a plug. Specific technical features include:

[0026] In the structural form shown in Figure 1, first, the two ends of the oil well pipe (1) to be tested are processed into welding grooves, and a number of plug welding holes uniformly distributed along the circumference are processed according to the distance of 100mm from the end face of the welding groove; One end of the test chuck (2) is processed into a groove and the test pipe welding groove is welded to form the main load-bearing weld (3), and the other end is threaded externally or internally to connect with the test equipment; the root of the plug welded seam (4) It is welded with the chuck, and the side is connected with the test tube; or / and a circle of reinforcing ribs (5) i...

Embodiment 2

[0038]For the specification of 88.90×6.45mm and the model of KO-13Cr-110 FOX oil pipe (common 13Cr stainless steel) produced by a Japanese company, the chuck welding was carried out by using the process of Example 1, and five kinds of parameters were stretched or stretched under internal pressure. Compression test: (1) The tensile load is 130,000kg, the internal pressure is 0, and the duration is 5 minutes, without any leakage and cracking; (2) The tensile load is 89,400kg, the internal pressure is 86.2MPa, and the duration is 5 minutes , without any leakage or cracking; (3) The compressive load is 50,800kg, the internal pressure is 109MPa, and the duration is 5 minutes, without any leakage or cracking; (4) The compressive load is 90,000kg, the internal pressure is 82.7MPa, and the continuous (5) The compressive load is 130,000kg, the internal pressure is 0, and the load lasts for 5 minutes. During the loading process, the oil pipe is unstable and deformed, but the welded join...

Embodiment 3

[0040] For the bushing (super 13Cr stainless steel) produced by a Japanese company with a specification of 137.70×9.17mm and a model of KO-HP1-13Cr110 FOX, the chuck was welded using the process of Example 1, and the internal pressure cycle and thermal cycle tests were carried out. The pressurization medium is dry nitrogen, and the leakage of the sample is detected by using a bubble bottle, and the pressurization rate is <34MPa / Min. A total of two parameters were tested, and the sample numbers were 1Z and 2Z. The 1Z sample was at 177°C, the test pressure was 64.5MPa, the 2Z sample was at room temperature, the test pressure was 87.9MPa, and the test method was cycled for one week according to the prescribed test method, and no leakage occurred.

[0041] After the test, continue to increase the test pressure until the sample fails. The internal pressure of the 1Z sample reached 131.6MPa, and the internal pressure of the 2Z sample reached 131.2 (2Z) MPa. The pipe body exploded,...

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Abstract

The invention relates to a welding method for the collet between the 35CrMo or 30CrMo and the oil drilling vitta, bushing made by the 13Cr martensitic stain less steel. The two ends of the oil drilling vitta are machined to welding groove and many uniformly plug welding holes are machined at the position of 100mm far from the welding groove; two of tested collets are welded into the groove, which is welded with the test pipe, the inner and out of the other end are machined with screw thread to connect with the test equipment; the plug welding root is welded with the collet and the side is connected with the test pipe; or it and / or pipes are set with a ring of reinforced tendon, which the material is the low alloy high strength steel and welded with the collet and test pipe by the angle welding line. In the condition of high temperature, pressure and loading, the joint head is welded well, so it solves the problem of connecting between the 13Cr pipe and collet and has high reliability and successful ration, low period to improve the working efficiency and decrease the cost comparing to the screw + glue sealing structure.

Description

technical field [0001] The invention relates to a method for preparing a test object by welding a 13Cr martensitic stainless steel oil well oil pipe or casing with a chuck of 35CrMo or 30CrMo or the like. Background technique [0002] In the process of oil and gas production, materials are often in high temperature, high pressure environment and multiphase flow corrosive medium where gas, water, hydrocarbon and solid coexist. Corrosion is one of the main failure modes of metal materials. The oil and gas development and processing industry has always been one of the industries with relatively serious corrosion, and almost involves various types of corrosion. The loss caused by corrosion problems is huge every year. Strengthening corrosion protection can bring huge economic benefits to the petroleum industry, and the use of materials with excellent corrosion resistance is one of the main directions for corrosion protection. [0003] The Kela gas field in the Tarim Oilfield co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N19/00G01N3/02G01N1/28
Inventor 李为卫刘迎来熊庆人赵新伟韩新利冯耀荣
Owner BC P INC CHINA NAT PETROLEUM CORP
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