油气井环空压力来源诊断研究进展

Research Progress in Diagnosis of Annular Pressure Sources in Oil and Gas Wells

随着石油和天然气的勘探开发,在役油气井环空陆续有压力产生,环空带压问题越发严重。为此,统计分析了国内外部分油气井的环空起压情况,环空压力来源广泛,大体可分为热效应、气体窜流及人工作业诱发3个方面。归纳并总结了现有的环空压力诊断方法,结合国内某储气库井的实测数据,分析了其环空压力的可能来源。从安全性、适用性、经济性及可靠性等角度对现有诊断方法进行了对比,提出了综合来源初判、漏点定位与泄漏程度分析3部分内容的油气井环空压力诊断建议,为环空压力的有效预防与科学管理提供一定参考。

With the exploration and development of oil and natural gas, the annular pressure of oil and gas wells in service is gradually produced. And the problem caused by annulus pressure has become more and more serious.Therefore, the annulus pressure of some oil and gas wells was statistically analyzed. The annular pressure comes from a wide range of sources, which can be roughly divided into three aspects: thermal effect, gas channeling and manual operation induction. The existing diagnosis methods of annulus pressure were summarized, and combined with the measured data of a gas storage well in China, the possible sources of annulus pressure were analyzed. The existing diagnostic methods were compared from the perspectives of safety, applicability, economy, and reliability, and recommendations for the diagnosis of annulus pressure in oil and gas wells were put forward, which integrated initial source judgment, leak location, and leak degree analysis. The paper can provide a certain reference for effective prevention and scientific management of annulus pressure.