Control method for improving anti-sticking performance and connection strength of round thread oil pipe and bushing

A control method and technology of connection strength, applied in casing, drill pipe, earth-moving drilling and other directions, can solve problems such as the influence of thread connection strength and sealing performance, weaken the anti-galling performance of joints, and increase thread gaps, etc. The effect of improving the anti-galling performance, significantly reducing casing accidents, and improving connection strength

Active Publication Date: 2012-09-19
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

[0005] In the process of realizing the present invention, the inventors have found that the prior art has at least the following problems: the existing control methods for improving the anti-seize performance and connection strength of API round thread oil pipes and casings often focus on improving the anti-seizure during practical application. Glue performance results in reduced joint strength, or weakens the anti-glue performance of the joint while improving the joint strength
The Chinese Utility Model Patent No. 99240437.1 discloses a method of increasing the tooth profile angle at the start of the thread to improve the anti-sticking performance of the thread, but increasing the thread profile angle will lead to thinning of the thread teeth, and after the thread meshes at the start end The thread gap increases, the anti-sticking performance of the thread is improved, but the connection strength and sealing performance of the thread are greatly affected

Method used

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  • Control method for improving anti-sticking performance and connection strength of round thread oil pipe and bushing
  • Control method for improving anti-sticking performance and connection strength of round thread oil pipe and bushing

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Embodiment 1

[0030] The embodiment of the present invention provides a comprehensive control method for improving the anti-seize performance and connection strength of API round thread oil / casing at the same time, see figure 1 , the control method includes controlling the yield strength of the material of the oil / casing 1 and the coupling 2 and controlling the parameters of the internal and external threads, and the internal and external threads are specifically the internal thread of the coupling 2 and the external thread of the oil / casing 1. The embodiment of the present invention is aimed at the control method of the API round thread oil casing, and other parameters not mentioned are all controlled according to the requirements of the API standard.

[0031] Slippage is essentially the yield deformation of the connection between the internal and external threads. In the final analysis, it is the failure of the material. Therefore, the yield strength of the material is one of the most impo...

Embodiment 2

[0041] In order to ensure that the API round thread oil / casing anti-seize performance and connection strength are improved in a balanced manner, this embodiment quantitatively controls various parameters on the basis of embodiment 1.

[0042] The yield strength of the control oil / casing 1 and coupling 2 materials described in the embodiment of the present invention is specifically:

[0043] The minimum value of the yield strength of the control oil / casing 1 material is 8-12% higher than the minimum value specified by the API Spec 5CT standard, and the minimum value of the yield strength of the control coupling 2 material is higher than the minimum value of the yield strength of the oil / casing 1 material 1-3%.

[0044] The control internal and external thread parameters described in the embodiments of the present invention are specifically:

[0045] Controlling the taper of the internal and external threads: the diameter increment per meter length of the internal and external ...

Embodiment 3

[0067] The control of APIΦ139.7×7.72mm N80 round thread casing 1 and coupling 2 is carried out in the following aspects:

[0068] (1) Material yield strength of control casing 1 and coupling 2:

[0069] The minimum yield strength of the casing material is controlled by 10% higher than the minimum value specified in the API Spec 5CT standard, that is, the yield strength of the casing 1 material is controlled within the range of 607-758MPa; the minimum yield strength of the coupling 2 material is within the API Spec The minimum value specified in the 5CT standard is 12% higher than the control, that is, the yield strength of the coupling material is controlled within the range of 618-758MPa.

[0070] (2) Geometric dimensions of control casing 1:

[0071] ① Outer diameter: The outer diameter deviation is controlled within the range of 0-+1%D, that is, the outer diameter of the casing is controlled within the range of φ139.7-141.10mm.

[0072] ②Wall thickness: The minimum value ...

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Abstract

The invention discloses a control method for improving the anti-sticking performance and connection strength of a round thread oil pipe and a bushing, which belongs to the technical field of improvement on the performance of API (American Petroleum Institute) round thread oil pipe and bushing entities in the petroleum and natural gas industry. The method comprises the following steps of: comprehensively controlling the yield strength of the oil pipe, the bushing and a coupling material; controlling the parameters of inner and outer threads; and controlling the coupling surface treating quality, wherein the inner and outer threads are specifically a coupling inner thread and a bushing outer thread. By comprehensively controlling the yield strength, the inner and outer thread parameters and the like of the oil pipe, the bushing and the coupling material, the anti-sticking performance of an API round thread is improved, the connection strength is improved greatly, the underground sealing reliability and strength reliability of the API round thread oil pipe and a bushing joint are enhanced, and safety in use of the API round thread oil pipe and the bushing is ensured.

Description

technical field [0001] The invention relates to the technical field of improving the physical performance of API round thread oil pipes and casings in the oil and natural gas industry, in particular to a comprehensive control method for simultaneously improving the buckling resistance and connection strength of API round thread oil pipes and casings. Background technique [0002] Tubing and casing are very important and widely used equipment in oil and gas exploration and development, accounting for about 25% of the total development cost on average. The tubing and casing are connected one by one through a thread with a certain taper to form a string, which is lowered into the well to form an oil and gas channel. API (American Petroleum Institute, American Petroleum Institute) standard round thread is referred to as API round thread. Due to its advantages of simple processing, convenient maintenance, good sealing performance and low price, it is widely used as the thread of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/02E21B17/08
Inventor 潘志勇宋生印刘文红王建东冯春
Owner BC P INC CHINA NAT PETROLEUM CORP
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