陆相页岩油气水平井穿层体积压裂技术

Vertical Penetration of Network Fracturing Technology for Horizontal Wells in Continental Shale Oil and Gas

蒋廷学 肖博 沈子齐 刘学鹏 仲冠宇

JIANG Tingxue XIAO Bo SHEN Ziqi LIU Xuepeng ZHONG Guanyu

页岩油气富集机理与高效开发全国重点实验室, 北京 102206 中石化石油工程技术研究院有限公司, 北京 102206

State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing, 102206, China Sinopec Research Institute of Petroleum Engineering Co., Ltd., Beijing, 102206, China

针对陆相页岩油气储层纵向不同岩性夹层发育、黏土含量高等对压裂带来的挑战，研究提出了陆相页岩油气水平井穿层体积压裂技术。该技术主要包括陆相页岩油气储层可压性评价、以预计最终可采储量（EUR）为目标的裂缝参数优化、以单簇裂缝模拟为基础的压裂施工参数优化、以提高远井缝高为基础的全程穿层压裂工艺优化、渗吸驱油一体化压裂液体系及性能评价和以渗吸机理为基础的压后闷井制度优化方法。研究结果表明，陆相页岩油气压裂的裂缝复杂性程度普遍较低，要实现体积压裂应聚焦于压裂主裂缝的密切割和全程穿层压裂。现场试验结果表明，穿层体积压裂技术可使产量提高20%以上，表明该技术具有推广应用价值。

In view of the challenges of many lithology interlayers vertically and high clay content in continental shale reservoirs, the vertical penetration of network fracturing technology for horizontal wells is proposed. This technology primarily includes the fracability evaluation of continental shale, optimization of fracture parameters for estimated ultimate recovery (EUR) maximization, optimization of fracturing treatment parameters based on single cluster fracture propagation simulation, optimization of whole-process vertical penetration of fracturing based on improving fracture height far from the borehole, development and evaluation the integrated fracturing fluid system with high imbibition and oil displacement efficiency, and optimization of post-fracturing shut-in period based on imbibition mechanisms, etc. The research results show that the complexity of fractures in continental shale oil and gas fracturing is generally low. To achieve network fracturing, the focus should be on the “dense cluster spacing” fracturing and the vertical penetration fracturing throughout the whole process. The field tests show that the production by vertical penetration of network fracturing can be increased by more than 20%. Therefore, this technology has significant potential for widespread application.

国家自然科学基金企业创新发展联合基金项目“海相深层油气富集机理与关键工程技术基础研究”（编号：U19B6003-05）资助

https://doi.org/10.11911/syztjs.2023078