摘要
为了有效开发低渗透、超低渗透油藏以及降低周边企业温室气体的减排压力,合理有效利用二氧化碳(CO2)气体,在长庆油田开展了注CO2提高采收率的室内岩心驱替实验,对CO2的注入方式、注入量及与渗透率的关系进行了研究。实验结果表明,低渗透油藏采用CO2水气交替驱能提高驱油效率,平均可提高13.3%;对于渗透率大于1.0×10-3μm2的相对高渗透岩心,驱油效率提高幅度最大,平均提高了17.6%;为了获得较高的驱油效率并且降低生产费用,水气交替驱注入孔隙体积倍数应为0.5～1.0。
In order to develop low-permeability and ultra-low permeability reservoirs,and reduce the greenhouse gas emissions effectively,and utilize the CO2 reasonably,Changqing oilfield implemented the CO2 lab EOR experiment.The displacement experiments on core samples were implemented by injecting immiscible CO2 and water alternately.The results showed that the oil recovery of low permeability reservoirs were enhanced by 13.3 % with CO2 flooding alternative with water,and 17.6% for the relatively high permeability reservoir higher than 1.0×10-3μm2.In order to obtain a higher oil displacement efficiency and reduce the production costs,the alternative injection volume of water and gas should be controlled at 0.5-1.0PV.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2010年第4期63-64,76,共3页
Petroleum Geology and Recovery Efficiency
关键词
特低渗透油藏
二氧化碳
水气交替驱
驱油效率
长庆油田
extra-low permeability reservoirs
CO2 and water alternative injection
displacement efficiency
injection volume
Changqing oilfield
