大庆石油地质与开发2025，Vol.44Issue(1)：107-113,7.DOI:10.19597/J.ISSN.1000-3754.202311050
古龙页岩油注CO2补能提高采收率机理及参数优化
Mechanism and parameters optimization of CO2 injection for energy complement to enhance recovery of Gulong shale oil
摘要
Abstract
Qingshankou Formation in Gulong Sag in northern Songliao Basin is a continental pure shale oil reservoir with nano-pores developed and extremely low permeability,and rapid energy depletion and production decline in natural depletion development strata.How to replenish formation energy and enhance oil recovery are urgent chal-lenge.In view of characteristics of Gulong shale oil reservoir,molecular simulation,lab experiment and numerical simulation are conducted to study CO2 injection for energy complement and oil recovery enhancement.Displacement capacity and diffusion rate of CO2 are evaluated by molecular simulation,expansion capacity and miscible pressure after CO2 contacting with oil are evaluated by lab experiment of CO2 injection,and different injection parameters of CO2 are optimally designed by numerical simulation.The results show that CO2 has high displacement capacity for pore boundary layer,as well as high expansion coefficient and low miscible pressure,which can achieve miscible flooding in original formation conditions.Numerical simulation design optimized huff-and-puff injection rate for sin-gle well is 200 t/d,with optimal soaking time of 30 d and optimal huff-and-puff cycle of 5 rounds.CO2 huff-and-puff for shale oil can achieve energy complement and oil increase effect,with expected single-well cumulative incremen-tal oil of 4 523 t.The research has important guiding significance for development planning for CO2 injection devel-opment of Gulong shale oil,providing technical support for efficient development of Gulong shale oil.关键词
古龙页岩油/CO2吞吐/提高采收率/参数优化Key words
Gulong shale oil/CO2 huff-and-puff/enhance oil recovery/parameters optimization分类
能源科技引用本文复制引用
曲方春,刘东旭,王青振,佟斯琴,邓森..古龙页岩油注CO2补能提高采收率机理及参数优化[J].大庆石油地质与开发,2025,44(1):107-113,7.基金项目
中国石油天然气股份有限公司重大科技专项"古龙页岩油效益开发理论与关键技术研究"(2021ZZ10-02). （2021ZZ10-02）
