齐40块蒸汽驱井组油层套管应力数值计算  

Calculation of casing stress of steam flooding wells in Block Qi40

作　　者：余中红[1] 檀德库[2] 郑成立[2] 陈捷[2] 郑之初[1] 

机构地区：[1]中国科学院力学研究所,北京100080 [2]中油辽河油田公司,辽宁盘锦124010

出　　处：《特种油气藏》2008年第1期99-102,共4页Special Oil & Gas Reservoirs

基　　金：中国石油天然气集团公司先导项目(20020493)

摘　　要：将蒸汽驱汽窜形成的窜流温度场结果引入井筒应力分析模型中,利用有限元分析软件ANSYS进行了井筒在不同约束条件下的应力计算。计算结果表明,最大热应力都发生在套管内壁,且超过了N80套管的热弹性屈服极限,最大热膨胀都发生在温度变化过渡区,当油层上覆盖层为泥页岩时,其热应变达到了2%,远超过材料弹性极限应变0.3%,是诱发热采井套管变形损坏的主要原因。The temperature field of steam channeling is introduced into borehole stress analysis model.Borehole stress is computed for different constraint conditions with finite element analysis software ANSYS.The result shows that,the maximum thermal stress occurs on inner casing wall and exceeds the thermoelastic yield limit of N80 casing,and the maximum thermal expansion occurs in temperature transition zone.The thermal strain may reach 2% when a reservoir has mud shale as its overburden,which is much higher than the elastic limit strain of 0.3% of the material and is the main reason inducing casing failure in thermal recovery wells.

关 键 词：蒸汽驱 套管变形 应力场 有限元法 数值模拟 齐40块 

分 类 号：TE2[石油与天然气工程—油气井工程]