摘要
针对松辽盆地莫里青油田特低渗储层动用困难的问题,利用物理模拟实验和核磁共振技术相结合的实验方法,开展长岩心CO_(2)驱替研究。结果表明:岩样CO_(2)驱替驱油效率介于72.30%~80.40%。大孔喉(>33 ms)平均赋存占比为33.65%,小孔喉(<33 ms)平均赋存占比为18.01%;1 PV的CO_(2)驱替后,岩样大孔喉平均相对采出程度为80.67%,小孔喉平均相对采出程度为17.45%;5 PV的CO_(2)驱替后,岩样大孔喉平均相对采出程度为95.68%,小孔喉平均相对采出程度为39.82%,大PV驱替可有效动用小孔喉的油。研究成果可为莫里青油田储层CO_(2)驱替提供理论支撑,同时也为同类油藏开展注气先导试验提供科学指导。
In order to solve the problem related to the difficulty in the utilization of the ultra-low permeability reservoir in Moliqing oilfield,Songliao Basin,the study of CO_(2) displacement of long core was carried out by using the experimental method of physical simulation experiment and nuclear magnetic resonance technology.The results show that CO_(2) displacement efficiency of rock samples ranges from 72.30%to 80.40%.The average occurrence ratio of macropore throat(>33 ms)is 33.65%,and that of micropore throat(<33 ms)is 18.01%.After CO_(2) displacement with a flow volume of 1 PV,the average relative recovery degree of macropore throat is 80.67%and the average relative recovery degree of small pore throat is 17.45%.After CO_(2) displacement with a flow volume of 5 PV,the average relative recovery degree of macropore throat is 95.68%,and the average relative recovery degree of small pore throat is 39.82%.A larger PV displacement can effectively use the oil of small pore throat.The research results can provide theoretical support for CO_(2) displacement in Moriqing oilfield,and also provide scientific guidance for pilot gas injection test in similar reservoirs.
作者
张辉
李忠诚
祝孝华
李金龙
李海波
姚兰兰
肖前华
ZHANG Hui;LI Zhongcheng;ZHU Xiaohua;LI Jinong;LI Haibo;YAO Lanan;XIAO Qianhua(PetroChina Jilin Oilfield Company,Songyuan,Jilin 138000,China;Exploration and Development Research Institute of Jilin Oilfield,Songyuan,Jilin 138000,China;China Petroleum Exploration and Development Research Institute,Beijing 100083,China;Chongqing University of Science and Technology,School of Petroleum Engineering,Chongqing 401331,China)
出处
《中国科技论文》
CAS
2024年第1期50-56,共7页
China Sciencepaper
基金
中石油CCUS重大专项课题资助项目(2021ZZ01-03)。
关键词
特低渗油藏
核磁共振
CO_(2)驱替
采出程度
ultra-low permeability reservoir
nuclear magnetic resonance
CO_(2)flooding
degree of recovery
