渤南油田义34块特低渗透油藏二氧化碳混相驱实验  

Laboratory investigation on CO_2 miscible displacement on special low-permeability reservoirs,Yi34 block,Bonan oilfield

作　　者：郭龙[1] 

机构地区：[1]中国石化股份胜利油田分公司石油开发中心,山东东营257000

出　　处：《油气地质与采收率》2011年第1期37-40,113,共4页Petroleum Geology and Recovery Efficiency

基　　金：中国石化集团公司先导试验项目"低渗透油藏CO2驱提高采收率先导试验"(P07087)

摘　　要：特低渗透油藏物性差,注水开发见效难,为了探索合理的开发方式,采用渤南油田义34块特低渗透油藏地层原油,进行了二氧化碳(CO2)混相驱实验研究。通过细管实验确定了CO2驱的最小混相压力,采用长岩心物理模型对完全水驱、完全水驱后持续CO2混相驱及初始持续CO2混相驱3种方式的驱替效果进行了实验研究。结果表明,该油藏最小混相压力为30.76 MPa,在目前地层温度和压力下,3种驱替方式下的最终采收率分别为42.15%,75.0%和69.21%。研究表明,CO2混相驱油可以获得比水驱更高的原油采收率,应尽早在渤南油田义34块油藏开展CO2混相驱矿场试验。Ultra low-permeability reservoirs of Yi34 block in Shengli Oilfield is hard to be developed by means of water flooding.In order to select some valid development model for this kind of reservoirs,lab experiment is implemented to study the minimum miscible pressure and different flooding efficiency of CO2 miscible displacement through slim tube model and long core model.The results of experiments indicate that：under the present conditions,the EOR for water drive is 42.15%,the EOR for water drive following CO2 miscible displacement is 75.0%,and the EOR for CO2 miscible displacement is 69.12%.That is,CO2 miscible displacement has higher EOR than water drive.The pilot test of CO2 miscible displacement in reservoirs Yi34 block in Bonan oil-field should be carried out earlier.

关 键 词：特低渗透油藏 CO2混相驱 长岩心模型 细管实验 驱油效率 

分 类 号：TE357.42[石油与天然气工程—油气田开发工程]