摘要
稠油井注汽热采过程中,热应力易使补贴管与水泥环之间出现微裂缝、微环隙,致使界面出现粘脱现象,进而导致补贴失效。为延长补贴管使用周期,首先基于井下管柱三轴热应力理论与界面破坏准则,运用ABAQUS有限元软件建立热采井补贴管热力耦合三维有限元模型,模拟实际注蒸汽热采过程,得出补贴管-水泥-旧套管-水泥-地层系统的温度场、应力场分布规律及补贴管界面粘脱情况,并研究不同注汽温度、注汽压力、胶结强度等因素对补贴管界面黏结状态的影响;随后将预应力技术应用于补贴管二次固井过程中,并在不同工况下将施加预应力技术前后补贴管界面粘脱状态进行对比,界面粘脱长度显著降低;最后确定了不同温升条件下的预应力施加值,为二次固井与套损治理提供指导意义。
In the process of steam injection thermal exploitation in heavy oil wells,thermal stress tends to cause micro-cracks and micro-annulus between subsidy pipe and cement ring,resulting in adhesive detachment phenomenon at the interface,which leads to subsidy failure.To prolong the service life of the subsidy pipe,first of all,based on the triaxial thermal stress theory and interface failure criterion of underground casing,the ABAQUS finite element software was used to establish the thermo-mechanical coupling three-dimensional finite element model of the subsidy pipe in thermal recovery well,and simulate the actual steam injection thermal recovery process.The temperature field and stress field distribution law of the subsidy pipe-cement-old casing-cement-formation system and the bonding state of the subsidy pipe interface were obtained,and the influences of different steam injection temperature,steam injection pressure and cementation strength on the bonding state of the subsidy pipe interface were studied.Then the prestressing technology was applied to the secondary cementing process of subsidy pipe,and the bonding state of subsidy pipe was compared before and after the application of prestressing technology under different working conditions,and the interface bonding length decreased significantly.Finally,the prestress applied value under different temperature rise conditions was determined,which has guiding significance for secondary cementing and casing loss control.
作者
郭良林
黄壮
夏成宇
冯超
伊亚辉
钱利勤
GUO Liang-lin;HUANG Zhuang;XIA Cheng-yu;FENG Chao;YI Ya-hui;QIAN Li-qin(School of Mechanical Engineering,Yangtze Lniversity,Jingzhou 434023,China;School of Automotive Engineering,Tongji Lniversity,Shanghai 201804,China)
出处
《科学技术与工程》
北大核心
2022年第32期14167-14173,共7页
Science Technology and Engineering
基金
湖北省重点研发计划(2021BAA053)
国家页岩油气富集机理与有效开发重点实验室基金(20-YYGZ-KF-GC-16)
国家自然科学基金(U1762214)。
关键词
热采井
热力耦合
套管补贴
预应力固井
界面粘脱
thermal recovery wells
thermal-mechanical coupling
casing subsidy
prestressed cementing
interface to take off
