考虑地应力耦合的热采井套管损坏分析  

ANALYSIS OF CASING FAILURE IN THERMAL PRODUCTION WELL WHEN EARTH STRESS CONSIDERED

作　　者：陈勇[1] 练章华[1] 乐彬[1] 李留伟[2] 高澜[3] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室 [2]西南石油局重庆钻井工程公司 [3]新疆油田分公司采油二厂地质所

出　　处：《钻采工艺》2007年第5期13-16,共4页Drilling & Production Technology

基　　金：国家自然科学基金;编号:50074025;国家教育部科学技术研究重点资助项目;编号:205135

摘　　要：考虑到热采过程会引起井筒附近地层局部温度场的改变,文中将注汽前地应力、热采过程中局部地应力改变以及套管热应力的作用三种因素进行耦合求解,计算得到套管的最大Von Mises等效应力。计算结果表明,热采注汽初始阶段套管温度迅速上升,使套管柱处于高温场中,在套管内部产生热应力。热采过程引起的局部地应力场改变对套管最大Von Mises等效应力有较大影响,仅仅考虑温度改变对套管Von Mises等效应力的影响是不够的,建议在计算套管Von Mises等效应力时,应尽量考虑地应力的作用。Local temperature field change near wellbore in thermal recovery process is considered, in-situ stress before injection, change of local earth stress during thermal recovery and thermal stress on casing are coupled to calculate the maximum Von Mises stress on casing. The result shows that casing temperature moves upward quickly in the initial injection period, casing lies in high temperature field, thermal stress is generated on casing. Change of local earth stress in thermal process has influence on the maximum Von Mises stress on casing, only considering casing temperature change is not enough. So, earth stress should be considered when calculating maximum Von Mises stress on casing.

关 键 词：地应力 耦合 温度场 热应力 套管损坏 有限元分析 

分 类 号：TE358[石油与天然气工程—油气田开发工程]