页岩气水平井压裂中地层滑移数值模拟研究  

Numerical Simulation of Formation Slippage in Shale Gas Horizontal Well Fracturing

作　　者：付盼 廖明豪 田中兰 李军[2] 乔磊 李林 吴志勇 Fu Pan;Liao Minghao;Tian Zhonglan;Li Jun;Qiao Lei;Li Lin;Wu Zhiyong(CNPC Engineering Technology R&D Company Limited;College of Petroleum Engineering, China University of Petroleum(Beijing))

机构地区：[1]中国石油集团工程技术研究院有限公司 [2]中国石油大学(北京)石油工程学院

出　　处：《石油机械》2019年第4期73-79,共7页China Petroleum Machinery

基　　金：国家油气重大专项"长宁-威远页岩气开发示范工程"(2016ZX05062);国家自然科学基金联合基金重点项目"页岩气水平井井筒完整性失效机理与控制方法"(U1762211)

摘　　要：为了解页岩气水平井在压裂过程中地层滑移导致套管变形的机理,结合套损井的现场资料,在岩石力学试验的基础上,利用COMSOL数值模拟软件对页岩气水平井在水力压裂过程中地层沿裂缝的滑移变形进行了数值模拟研究。研究结果表明:随着缝内流体压力的增高,裂缝面的滑移量增大,当缝内流体压力达到50 MPa时,裂缝面的滑移量可达到厘米级;当存在多条裂缝时,单一裂缝内流体压力的改变会导致邻近裂缝应力场和滑移量的改变,当缝内流体压力达到80MPa时,对邻近裂缝可产生比较明显的影响;裂缝与裂缝之间的夹角越接近45°,两者之间的影响越明显,且随着裂缝之间距离的增加,相互之间的影响越小,当距离达到80 m时,两者之间基本无影响。研究成果对认识页岩气井剪切型套管变形及对如何预防套管损坏具有一定的理论指导意义。To understand the mechanism of casing deformation caused by formation slip in shale gas horizontal well fracturing, combined with the field data of casing damage wells, based on rock mechanics test, the numerical simulation of the slip deformation of the formation along the fracture during the hydraulic fracturing of shale gas horizontal well was conducted using COMSOL numerical simulation software. The results show that, with the increase of fracture fluid pressure, the slippage of the fracture surface increases. When the fluid pressure in the fracture reaches 50 MPa, the slippage of the fracture surface can reach to centimeter level. When multiple fractures exist, the change of fluid pressure in a single fracture will lead to the change of stress field of adjacent fractures and slippage. When the fluid pressure in the fracture reaches 80 MPa, it will have a remarkable influence on adjacent fractures. The closer the angle between fractures to 45°, the more significant the influence between the two.The increase of the distance between fractures leads to smaller mutual influence. When the distance reaches 80 m,no influence is observed between the two fractures.

关 键 词：页岩气 水平井 水力压裂 地层滑移 套管损坏 数值模拟 

分 类 号：TE377[石油与天然气工程—油气田开发工程]