深层高温高压气井完井测试管柱失效分析

深层高温高压油气井完井测试管柱的安全可靠对于确保深层油气的安全高效开发具有重要意义。考虑测试过程中的温压变化、管柱端部约束及屈曲摩阻等因素综合影响，建立了测试管柱受力分析模型，开发了深层高温高压气井完井测试管柱力学分析软件，对新疆顺南地区某井测试管柱进行了温度压力分析、受力变形计算和力学强度校核，揭示了该井完井测试管柱失效的原因。结果表明:利用开发的软件能够较为准确地分析高温高压井测试管柱所处的温压环境，并能对其进行受力变形分析和强度校核，可用于工程实际；该井测试管柱表面受到的局部腐蚀损伤和产生的裂纹会使管柱强度降低，是导致其失效的主要原因；该地区高温高压井中腐蚀对管柱力学强度的影响应给予特别重视。该研究可为高温高压井完井测试管柱优化设计及安全控制提供理论依据。

Failure analysis of completion test string for deep high-temperature and high-pressure gas well: A case study on a well in Shunnan area

The safety and reliability of the completion test string for deep high-temperature and high-pressure oil and gas wells is of great significance to ensure the safe and efficient development of deep oil and gas. Considering the comprehensive influence of factors such as temperature and pressure changes, pipe end constraints, and buckling friction during the test, the force analysis model of the test pipe string was established, and the mechanical analysis software of the completion test pipe string for deep high-temperature and high-pressure gas wells was developed. Then, the temperature and pressure analysis, stress deformation calculation, and mechanical strength check of the test string in a well in Shunnan area were performed, which revealed the reasons for the failure of well completion test string. The results show that: the developed software can more accurately analyze the temperature and pressure environment for the test string in the high-temperature and high-pressure wells, and can perform stress deformation analysis and strength check, which can be used in engineering practice; the local corrosion damage and the generated cracks on the surface of the test string in the well will reduce the strength of the pipe string, which is the main reason for its failure; special attention should be paid to the effect of corrosion on the mechanical strength of the pipe string in high-temperature and high-pressure wells in this area. This research can provide a theoretical basis for the optimal design and safety control of the completion test string in high-temperature and high-pressure wells.