稠油热采井射孔孔眼应力分析及影响因素  

Stress Analysis and Influencing Factors of Perforation in Heavy-Oil Thermal Recovery Wells

作　　者：梁疆岭[1] 杨洪[1] 苏宏益[1] 林铁军[2] 赵朝阳 但晗 Liang Jiangling;Yang Hong;Su Hongyi;Lin Tiejun;Zhao Chaoyang;Dan Han(PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang 834000,China;National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 615000,China)

机构地区：[1]中国石油新疆油田分公司,新疆克拉玛依834000 [2]西南石油大学油气藏地质及开发工程全国重点实验室,四川成都615000

出　　处：《特种油气藏》2024年第1期152-158,共7页Special Oil & Gas Reservoirs

基　　金：国家自然科学基金面上项目“深层页岩多级分段压裂套管变形容忍限研究”(52274042)。

摘　　要：针对稠油热采井生产过程中,射孔井段套管频繁出现损伤断裂的问题,基于弹塑性和热力学理论,采用有限元方法建立注汽—焖井—生产过程射孔套管有限元热力学耦合模型,对各阶段射孔套管应力分布特征进行研究,并开展不同射孔参数下射孔套管强度影响规律分析。研究表明:生产过程中射孔孔眼位置出现明显应力集中现象,在温差及内外压差等共同作用下,注采前期套管应力最大可达498.16 MPa,并逐渐产生塑性失效现象,当注采作业完成时,套管塑性失效现象最严重;随着射孔相位角增大,射孔密度对Mises应力值的影响逐渐减小,而套管孔眼最大应力与射孔相位角成反比关系。该研究对延长稠油热采井射孔套管使用年限和保障正常生产作业具有十分重要的意义。Aiming at the problems of frequent damage and fracture of perforated casing during the production process of thermal recovery wells,based on the theory of elasticity-plasticity and thermodynamics,a finite element thermodynamic coupling model of perforated casing during the process of steam injection-stewing-production was established by using finite element method to research the stress distribution characteristics of the perforated casing in each stage,and analyze the strength influence rule of the perforated casing under different parameters of perforated casing.The study shows that the obvious stress concentration occurs at the location of the injection hole boreholes during the production process.The casing stress could reach up to 498.16 MPa in the early stage,and the plastic failure occurs gradually under the joint action of the temperature difference and the internal and external pressure difference.The casing plastic failure is the most serious once the injection and production operation is completed.The influence of the perforation density on the value of Mises stress decreases with the increase of the perforation phasing degree,and the maximum perforation stress is inversely related to the perforation phasing degree.This study is of great significance to prolong the service life of perforated casing in heavy-oil thermal recovery wells and to ensure normal production operation.

关 键 词：稠油热采 套管损伤 射孔孔眼 套管强度 应力集中 

分 类 号：TE357[石油与天然气工程—油气田开发工程]