基于LGR模拟裂缝的页岩油藏注CO_(2)吞吐开发参数优化  

Optimization of CO_(2) Injection Huff and Puff Development Parameters in Shale Reservoirs Based on LGR Simulation Fractures

作　　者：张伟[1] 李俊超 畅新鸽 ZHANG Wei;LI Junchao;CHANG Xinge(School of Mechanical Engineering,Xi'an Shiyou University,Xi'an,Shaanxi 710065,China;Xi'an Key Laboratory of Integrity Assessment of High-Difficulty Complex Oil and Gas Wells,Xi'an,Shaanxi 710065,China)

机构地区：[1]西安石油大学机械工程学院,陕西西安710065 [2]西安市高难度复杂油气井完整性评价重点实验室,陕西西安710065

出　　处：《石油工业技术监督》2024年第3期21-28,共8页Technology Supervision in Petroleum Industry

摘　　要：页岩油商业化开采需要进行大规模水力压裂来建立高渗流通道,从而提高采收率。但压裂后裂缝易闭合,地层压力衰竭快,导致采收率低。CO_(2)吞吐开发技术能够有效补充地层能量,改善原油流动性,对提高页岩油藏开发效果有极大潜力。不同的CO_(2)吞吐开发参数会对页岩油的采收效果产生影响。采用基质-人工裂缝-天然裂缝的多重介质模型,并结合局部网格加密(LGR)来模拟人工裂缝,以提高模拟精度与效率。基于实例研究,对注气总量、注气速度、焖井时间、吞吐轮次等主要参数进行了优化,以提高CO_(2)吞吐开发的效益。研究结果显示,多重介质数值模拟方法结合CO_(2)吞吐开发可以有效预测生产效果,并优化开发参数,为提高页岩油藏CO_(2)吞吐开发效益提供有力的依据。Commercial production of shale oil requires large-scale hydraulic fracturing to create high seepage channels and thus en-hance oil recovery.However,after fracturing,the fracture is easy to close and the formation pressure is quickly exhausted,resulting in low recovery.CO_(2) throughput development technology can effectively supplement the formation energy and improve the fluidity of crude oil,which has great potential to improve the development effect of shale reservoirs.Different CO_(2) throughput development param-eters will affect the recovery effect of shale oil.In order to improve the simulation accuracy and efficiency,a multi-medium model of matrix,artificial fracture and natural fracture combined with local mesh encryption(LGR)was used to simulate the artificial fracture.Based on the case study,the main parameters such as total gas injection,gas injection speed,braising time and huff and puff cycles were optimized to improve the efficiency of CO_(2) huff and puff development.The results show that the multi-medium numerical simula-tion method combined with CO_(2) huff and puff development can effectively predict the production effect and optimize the development parameters,which provides a strong basis for improving the CO_(2) huff and puff development benefits of shale reservoir.

关 键 词：页岩油藏 注CO_(2)吞吐 数值模拟 LGR局部网格加密裂缝 参数优化 

分 类 号：TE357.7[石油与天然气工程—油气田开发工程]