An analysis and evaluation method for gas sealing threads of tubing in high temperature and high pressure gas wells

A high temperature and high pressure, analysis and evaluation technology, applied in the testing of machine/structural parts, vibration testing, testing of mechanical parts, etc., can solve the main seal contact pressure drop, failure to consider stress corrosion gas seal and vibration fatigue gas seal and Fracture failure, downhole thread internal pressure gas seal failure, etc., to achieve the effect of avoiding failure
CN108982076BActive Publication Date: 2020-03-10BC P INC CHINA NAT PETROLEUM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BC P INC CHINA NAT PETROLEUM CORP
Publication Date
2020-03-10

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Abstract

The invention discloses an analysis and evaluation method for hermetic seal thread of a tubing of a high-temperature high-pressure gas well. The hermetic seal applicability of a limit tolerance samplein the condition load and stress correction environment under different make-up torques is tested and evaluated by analyzing the make-up torque of the hermetic seal thread according to down-hole workenvironment characteristics of the high-temperature high-pressure gas well and structural characteristics of the thread; according to analysis on the make-up torque of the hermetic seal thread, the limit tolerance and torque are selected to analyze hermetic seal finite elements under the condition load spectrum, and the down-hole condition load spectrum sealing after make-up of the hermetic sealthread is analyzed; and thread dynamic-load anti-fatigue analysis in the gas production process of a down-hole tubing string is analyzed, an applicability test and evaluation process is determined according to links likely to fail in analysis, and the applicable reliability of the thread is evaluated and analyzed comprehensively. The method can be widely applied to high-temperature high-pressure gas wells as well as unconventional multi-segment high cracking gas wells, especially to evaluate selection and applicability of threads of well-completion tubing strings of deep and ultradeep wells inTarim and southwest oil and gas fields.
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Description

technical field

[0001] The invention belongs to the technical field of petroleum and natural gas development, and in particular relates to an analysis and evaluation method for gas sealing threads of oil pipes of high-temperature and high-pressure gas wells. Background technique

[0002] The representative oil and gas fields of high temperature and high pressure three super gas wells in China are Tarim and Southwest China. For oil and gas wells with such complex working conditions, the representative method for the detection and evaluation of tubing string threads is the four-level test evaluation (CALIV) of ISO13679; Numerous leaks and broken failures. Compare and analyze the difference between the actual downhole working conditions and the evaluation method:

[0003] 1) Thread make-up: According to the ISO test standard, for sample 1# with the worst air-tightness of the thread limit tolerance, make-up according to the minimum torque, according to the minimum contact leng...

Claims

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