吉林特低渗油藏长岩心CO_(2)驱替微观动用规律研究  

Study on micro-utilization of CO_(2) drive in long core of Jilin ultra-low permeability reservoir

作　　者：张辉[1] 李忠诚[2] 祝孝华[1] 李金龙[2] 李海波[3] 姚兰兰 肖前华[4] 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)

机构地区：[1]中国石油吉林油田公司,吉林松原138000 [2]吉林油田勘探开发研究院,吉林松原138000 [3]中国石油勘探开发研究院,北京100083 [4]重庆科技学院石油与天然气工程学院,重庆401331

出　　处：《中国科技论文》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)。

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.

关 键 词：特低渗油藏 核磁共振 CO_(2)驱替 采出程度 

分 类 号：TE341[石油与天然气工程—油气田开发工程]