高含水油藏CO2驱机理深化研究

Further Study On The Mechanism Of CO2 Flooding In High Water Cut Reservoir

CO2是高含水油藏提高采收率的有效手段,但高含水油藏驱替机理比较复杂。本文应用室内试验研究表明,CO2驱替孔吼半径为0.01μm,能够驱替水驱驱不到的剩余油;高含水油藏CO2-水对储层岩石溶蚀作用导致渗透率、孔隙度增大;油藏条件下,CO2在油中的溶解能力是在水中溶解的9.7倍,注入的CO2主要溶解的地层原油中。研究成果对高含水油藏CO2驱提高采收率技术现场实施具有重要指导意义。

CO2 is an effective way to enhance oil recovery in high water cut reservoirs,but the displacement mechanism in high water cut reservoirs is rather complicated.In this paper,the laboratory test shows that the radius of CO2 displacement hole roar is 0.01 microns,which can displace the remaining oil that can not be achieved by water flooding,and the permeability and porosity of CO2-water in high water cut reservoir lead to the permeability and porosity of the reservoir rock,and the solubility of CO2 in oil is9.7 times that of water in the oil reservoir,and the main dissolved CO2 is dissolved in the oil reservoir.The solution of the formation of crude oil.The research results have important guiding significance for on-site implementation of enhanced oil recovery technology for CO2 flooding in high water cut reservoirs.