深层页岩水力压裂对套管变形的影响  

Influence of hydraulic fracturing on casing deformation of deep shale gas reservoir

作　　者：何歆如 朱海燕 王向阳 赵鹏 唐煊赫 王亚娟 王亮亮 HE Xinru;ZHU Haiyan;WANG Xiangyang;ZHAO Peng;TANG Xuanhe;WANG Yajuan;WANG Liangliang(College of Energy,Chengdu University of Technology,Chengdu 610059,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;CNPC Engineering Technology R&D Company Limited,Beijing 100007,China;State Key Laboratory of Geohazard Prevention and Enviroment Protection,Chengdu University of Technology,Chengdu 610059,China;No.4 Gas Production Plant of Sinopec Southwest Oil and Gas Branch,Chongqing 402160,China;School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]成都理工大学能源学院,四川成都610059 [2]成都理工大学油气藏地质及开发工程全国重点实验室,四川成都610059 [3]中国石油集团工程技术研究院有限公司,北京100007 [4]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059 [5]中国石化西南油气分公司采气四厂,重庆402160 [6]中国石油大学(华东)石油工程学院,山东青岛266580

出　　处：《断块油气田》2024年第4期726-733,共8页Fault-Block Oil & Gas Field

基　　金：国家自然科学基金面上项目“页岩气立体加密井组压裂复杂裂缝扩展与井间干扰机理研究”(52374004)。

摘　　要：为了深入研究四川盆地深层页岩气储层水力压裂过程中影响套管变形的主要因素和套管失效机理,文中基于地质工程一体化思想,建立了深层页岩水力压裂过程中的地层-水泥环-套管耦合作用下的三维有限元数值模型以及诱发断层或天然裂缝滑移的模型。以泸203井为例,系统分析了该井水力压裂缝扩展过程中的地应力演化过程,明确了压裂过程多因素影响下的断层/天然裂缝滑移为深层页岩套变主控因素。研究结果表明:1)水力压裂过程中,三向地应力发生变化,直接影响水力裂缝扩展规律和展布特征;2)固井质量的缺陷对于套损的影响较为微弱,水力压裂引起的断层/天然裂缝滑移是引起套损的主要原因;3)压裂初期断层/天然裂缝存在快速滑移现象,当断层内流体压力足以克服垂向应力时,断层面上的剪应力完全释放,滑移停止。研究成果可为深层页岩气储层通过水力压裂高效开发提供参考。In order to further study the main factors of casing deformation and casing failure mechanism during hydraulic fracturing of deep shale gas reservoir in Sichuan Basin,this paper established a three-dimensional finite element numerical analysis model under formation-cement sheath-casing coupling for deep shale hydraulic fracturing as well as a model for inducing slip of fault or natural fractures based on the idea of integration of geological engineering.Taking Well Lu 203 as an example,the evolution process of in-situ stress during hydraulic fracture propagation is systematically analyzed,and the main controlling factors of deep shale casing deformation under the influence of multiple factors in fracturing process are identified.The results show that:(1)During hydraulic fracturing,the three-dimensional in-situ stress changes affects the propagation law and distribution characteristics of hydraulic fractures;(2)The defects of cementing quality have a weak impact on casing deformation,and the slip of faults or natural fractures caused by hydraulic fracturing is the main cause of casing deformation;(3)In the early stage of fracturing,there is a rapid sliding phenomenon in faults or natural fractures.When the fluid pressure within the fault is sufficient to overcome the vertical stress,the shear stress on the fault surface is completely released and the slip stops.The research results can provide reference for the efficient development of hydraulic fracturing in deep shale gas reservoirs.

关 键 词：深层页岩气 水力压裂 地应力演化 数值模拟 套管变形 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]