川西气田高含硫气井油套环空带压处置、管控技术应用及推广

Casing Annulus Pressure Treatment, Application and Popularization of Management and Control Technology in High Sulfur Gas Wells in Chuanxi Gas Field

摘要: 川西气田主力气藏为雷口坡组，属于海相地层，具有高含硫特征，其中金马构造硫化氢含硫3.72%，鸭子河构造硫化氢含硫5.63%，且由于气田位于川西平原西缘，地势平坦，工农业发达，人口密集，如在油气测试及生产过程中出现油套环空带压情况，势必产生重大安全隐患。结合PZ5-2D井油套环空异常起压现场处置实际情况，通过分析环空压力来源，计算最大允许井口压力，采取环空吊灌堵漏等措施进行处置，后续制定专项管控方案进行管控，确保了该井安全可控，形成一套川西气田高含硫气井油套环空带压处置及管控技术，为后续类似情况井治理及管控提供了解决思路。

Abstract: The main gas reservoir in Chuanxi gas field is Leikoupo formation, which belongs to marine strata and has high sulfur content. The sulfur content of hydrogen sulfide in Jinma structure is 3.72%, and that in Yazihe structure is 5.63%. And gas field is located in Chuanxi plain, where industry and agriculture are developed, with intense population, if the abnormal annulus pressure of tubing- casing annulus appears in the process of gas testing and production, it is bound to cause great potential safety hazard. Combining with the actual situation and field treatment for the abnormal annulus pressure rise of the tubing-casing annulus in the well PZ5-2D, by analyzing the source of annulus pressure, calculating the maximum allowable wellhead pressure, and adopting measures such as annulus lifting to stop the leak, ensured the safety and control of the gas well, a set of annulus pressure treatment and control technology for the high hydrogen sulfide gas well in Chuanxi gas field has been developed, which provides a solution for the treatment and control of similar wells in the future.