物质点法在页岩储层压裂模拟研究中的应用

Application of material point method in shale reservoir fracturing simulation study

冯江荣 赵圣贤 夏自强 李志宏 刘永旸 何沅翰 高攀 王高翔

中国石油西南油气田分公司页岩气研究院，四川 成都 618300 北京源烃泰克科技有限公司，北京 100102

Research Institute of Shale Gas, Southwest Oil and Gas Field Company, PetroChina, Chengdu 618300, China Beijing Yuantingtaike Technology Co., Ltd., Beijing 100102, China

针对数值模拟法在水力压裂模拟应用中的存在问题，提出了针对页岩储层压裂的物质点法（MPM）压裂模拟方法，并应用于四川盆地渝西地区五峰组—龙马溪组一段页岩储层。结果表明：模拟的应力方向和应力场差异系数分布与实际测试数据一致，地层压裂应变特征与微地震监测结果吻合良好，模拟结果可信度高；在裂缝发育带（裂缝方向与最大水平主应力方向近垂直），当井轨迹方位与最大水平主应力方向夹角为70°左右时，压裂模拟改造面积最大；在网状裂缝发育区，当井轨迹方位与最大水平主应力方向近垂直时，压裂模拟改造面积最大。文中成果为水平井井轨迹设计和施工参数优化提供了有效的技术支撑。MPM压裂模拟技术的应用，也为减少微地震监测工作量，降低工程成本，提升页岩气开发效益提供了有效途径。

Focused on the shortcomings of numerical simulation method in the hydraulic fracturing simulation, the material point method (MPM) was proposed for shale reservoir fracturing and applied in the shale reservoir from Wufeng Formation to first member of Lomgmaxi Formation in western Chongqing of Sichuan Basin. The results show that the stress direction and the difference coefficient distribution of stress field are consistent with the actual test data, the formation fracturing strain characteristics are in good agreement with the micro-seismic monitoring results, and the simulation results are highly reliable. In the fracture zone (the fissure direction is close to the maximum level main stress direction)， when the angle between the well trajectory and the maximum horizontal stress direction is about 70°, the area of fracturing simulation is the largest. In the network fracture zone, when the well trajectory is perpendicular to the maximum horizontal stress direction, the area of fracturing simulation is the largest. The results provide effective technical suppport for horizental well trajectory design and construction parameters optimization. The application of MPM fracturing simulation method provides an effective way to reduce the number of micro-seismic monitoring, decrease engineering cost and improve the efficiency of the shale gas development.

10.6056/dkyqt202205020