页岩油藏注CO_(2)提高采收率开发研究现状及展望

Present research situation and prospect of CO_(2) injection for enhanced oil recovery in shale reservoir

实现非常规页岩油藏高效开发可以解决常规油气资源剩余储量短缺问题,保障我国能源安全具有战略性重要意义。根据页岩油藏储层基本特征,分析了页岩油藏不同提高采收率方式的可行性,认为注CO_(2)方式更加适合页岩油藏。在实现双碳目标(碳达峰、碳中和)的背景下,注CO_(2)一方面有效提高页岩油藏采收率,一方面有利于推动碳捕获、利用与封存(CCUS)进程。因此未来不仅页岩油藏注CO_(2)技术应用规模甚至应用至其他非常规如致密油、页岩气等都将会进一步扩大。在此基础上分别阐述了注CO_(2)技术(CO_(2)驱、CO_(2)吞吐)的驱油机理、影响因素、存在的问题以及未来发展方向。该研究以期为我国页岩油藏注CO_(2)提高采收率技术发展推广提供参考和借鉴。

Efficient development of unconventional shale reservoirs can solve the problem of conventional oil and gas reserves shortage and ensure China's energy security is of strategic importance.Based on the basic characteristics of shale reservoir,the feasibility of different EOR methods for shale reservoir is analyzed,and it is concluded that CO_(2) injection is more suitable for shale reservoir.Under the background of double carbon target(carbon peak,carbon neutrality),CO_(2) injection can improve the recovery of shale reservoir effectively and promote the process of carbon capture,utilization and storage(CCUS)on the one hand.Therefore,in the future,not only the application scale of CO_(2) injection technology in shale reservoir,but also other unconventional applications such as tight oil,shale gas will be further expanded.On this basis,the oil displacement mechanism,influencing factors,existing problems and future development direction of CO_(2) flooding technology(CO_(2) flooding and CO_(2) huff-n-puff)are expounded.The study will provide a reference for the development and popularization of CO_(2) enhanced oil recovery technology in shale reservoirs in China.