非均匀地应力下套管应力的敏感性分析  

Sensitivity Analyses of Casing Stress Under Non-uniform In-situ Stress

作　　者：杨军伟 贾善坡 隋晓凤 王建军 贺海军[4] YANG Jun-wei;JIA Shan-po;SUI Xiao-feng;WANG Jian-jun;HE Hai-jun(College of Civil Engineering&Architecture,Northeast Petroleum University,Daqing Heilongjiang 163318,China;Institute of Unconventional Oil&Gas,Northeast Petroleum University,Daqing Heilongjiang 163318,China;State Key Laboratory for Performance and Structural Safety of Petroleum Tubular Goods and Equipment Materials,CNPC Tubular Goods Research Institute,Xi'an Shaanxi 710077,China;Heilongjiang Provincial Key Laboratory of Oil and Gas Reservoir Stimulation,Research Institute of Oil Production Engineering,Daqing Oilfield Co.,Ltd.,Daqing Heilongjiang 163453,China)

机构地区：[1]东北石油大学土木建筑工程学院,黑龙江大庆163318 [2]东北石油大学非常规油气研究院,黑龙江大庆163318 [3]中国石油集团石油管工程技术研究院石油管材及装备材料服役行为与结构安全国家重点实验室,陕西西安710077 [4]大庆油田有限责任公司采油工程研究院黑龙江省油气藏增产增注重点实验室,黑龙江大庆163453

出　　处：《当代化工》2022年第3期619-624,共6页Contemporary Chemical Industry

基　　金：国家自然科学基金面上项目(项目编号:42072166);黑龙江省自然科学基金项目(项目编号:LH2020D004)。

摘　　要：套损是影响地下储气库井筒完整性的关键问题,制约着储气库长期的安全生产。为此,基于弹性力学理论,运用有限元分析方法,建立了理想固井状态下的套管-水泥环-地层组合分析模型,对受非均匀地应力时组合体各层Mises应力的分布规律进行了研究,讨论了套管应力对水泥环与地层的弹性参数变化的敏感程度。结果表明:套管内壁的应力明显高于水泥环和地层内壁的应力且沿井周呈非均匀分布;地层弹性模量对套管内壁应力的影响最为显著,套管应力随地层弹性模量的增加急剧减小;其次为水泥石弹性模量,当其与地层弹性模量相同时,套管应力达到最大。该研究成果可为优化套管完井设计和预防套管损坏提供理论参考。Casing failure is a key problem affecting the wellbore integrity of underground gas storage and restricts the long-term safe production of gas storage. Therefore, based on the elastic mechanics theory, a combination analysis model of casing-cement sheath-formation under ideal cementing state was established using finite element analysis.The Mises stress in each layer of the combination was studied under non-uniform in-situ stress, and the sensitivity of casing stress to elastic parameters of cement sheath and formation was discussed. The results showed that the stress in the inner wall of casing was obviously higher than that in the cement sheath and the inner wall of formation, and the stress was non-uniform along the well circumference. The formation elastic modulus had the most significant effect on casing wall stress, and casing stress decreased sharply with the increase of it. Secondly, the casing stress reached the maximum when the elastic modulus of cement was the same as that of formation. The research results can provide a certain theoretical reference for optimizing casing completion design and preventing casing damage.

关 键 词：地下储气库 有限元 套管-水泥环-地层 非均匀地应力 敏感性分析 

分 类 号：TE256[石油与天然气工程—油气井工程]