摘要
设计了多测点物理模拟装置,利用整体压制的特低渗长岩芯,研究了特低渗油藏超前注水开发的压力传播特征、合理地层压力保持水平和采油井合理开井时机。实验结果表明:为获得较高的采收率,合理地层压力应保持在原始地层压力的110%～120%,合理的油井开井时机为压力传播到油水井间距的30%左右时。压力传播速度沿岩芯长度逐渐减小,建议注水强度与压力传播速度相匹配,初期适当增加注水强度,有利于尽快建立驱替压力系统,后期适当降低注水强度,保持温和注水,以获得最佳的注水效果。
In order to study the advanced water injection of extra-low permeability reservoir,including pressuretransmission characters,the level of formation pressure and reasonable working time of production well,we designlong-core physical simulation equipment with multi-pressure measurement nodes and use extra-low permeabilitylong cores.The experiment results show that higher recovery ratio should be obtained when the formation pressurebetween 110%120%of initial formation pressure.When the pressure spread to 30%of the distance is between waterwell and oil well,it is the reasonable well opening time.The velocity of pressure propagation trend to decrease asthe core length increase,so we suggest that water intake per unit thickness should match with the velocity of pressurepropagation,and flooding should enhance properly at initial stage,which is beneficial for establishing a displacementpressure system as quickly as possible.Flooding should be reduced properly at later stage,in order to achieve thebest flood effectiveness.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第3期105-108,197,共4页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家"973"重大基础研究前期研究专项(2002CCA00700)
关键词
特低渗
超前注水
长岩芯
压力保持水平
注水强度
extra-low permeability
advance water injection
long core
pressure maintenance level
water intake per unit thickness
