基于扩展有限元法的多径向井压裂裂缝形态

通过ABAQUS扩展有限元法（XFEM）建立基于地层流-固耦合方程的储层模型,以最大主应力准则、最大能量释放率准则为损伤机制,模拟分析单径向井、垂向多径向井、水平多径向井情况下的裂缝形态,并通过大型真三维物理模拟试验在一定程度上验证数值模拟结果的正确性。在多径向井压裂裂缝形态研究的基础上,对径向钻孔的布孔方案进行优化。结果表明：压裂时沿径向井分布的诱导应力场是压裂裂缝沿径向井定向扩展的根本原因,其有效引导距离可达40 m;垂向多径向井可有效强化压裂裂缝的定向扩展效果,且具备降低起裂压力的能力;水平多径向井在远井带形成沿各径向井独立扩展的主裂缝,近井带形成沟通相邻两径向井的次级裂缝,两者协同可有...

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Published in中国石油大学学报（自然科学版） Vol. 42; no. 1; pp. 73 - 81
Main Author 曲占庆;李小龙;李建雄;郭天魁;田克寒;张伟;田雨
Format Journal Article
LanguageChinese
Published 中国石油大学石油工程学院,山东青岛,266580%四川大学建筑与环境学院,四川成都,610065 2018
Subjects
径向井压裂;诱导应力场;干扰应力场;定向扩展;扩展有限元法
induced stress field
interference stress field
extended finite ele-ment method
干扰应力场
radial well fracturing
定向扩展
径向井压裂
扩展有限元法
诱导应力场
orientated propagation
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Summary:通过ABAQUS扩展有限元法（XFEM）建立基于地层流-固耦合方程的储层模型,以最大主应力准则、最大能量释放率准则为损伤机制,模拟分析单径向井、垂向多径向井、水平多径向井情况下的裂缝形态,并通过大型真三维物理模拟试验在一定程度上验证数值模拟结果的正确性。在多径向井压裂裂缝形态研究的基础上,对径向钻孔的布孔方案进行优化。结果表明：压裂时沿径向井分布的诱导应力场是压裂裂缝沿径向井定向扩展的根本原因,其有效引导距离可达40 m;垂向多径向井可有效强化压裂裂缝的定向扩展效果,且具备降低起裂压力的能力;水平多径向井在远井带形成沿各径向井独立扩展的主裂缝,近井带形成沟通相邻两径向井的次级裂缝,两者协同可有效提高泄油面积、降低近井带油流阻力。
Bibliography:37-1441/TE
QU Zhanqing;LI Xiaolong;LI Jianxiong;GUO Tiankui;TIAN Kehan;ZHANG Wei;TIAN Yu;School of Petroleum Engineering in China University of Petroleum;College of Architecture ＆ Environment in Sichuan University
The technology of radial well fracturing has been applied in various oil fields and proved to be effective,and the crack morphology needs an intensive investigation.In this study,a formation fracturing model was built using the extended finite element method（XFEM） based on fluid-solid coupling equations,and the maximum principal stress criterion and maximum energy release rate criterion were both used as the damage mechanisms of rock materials.The simulation results of three types of well models（i.e.the single radial well,vertical multiple radial wells and horizontal multiple radial wells） were analyzed,and verified by 3D physical experiments in the laboratory.It has concluded that an induced stress field along the radial well during fracturing is the main reason for the propagation major fractures.Th
ISSN:1673-5005
DOI:10.3969/j.issn.1673-5005.2018.01.009