低渗透砂岩油藏渗吸采油影响因素研究

Influencing factors of imbibition recovery in low permeability sandstone reservoir

通过对低渗透砂岩应用静态渗吸实验方法,研究界面张力、渗透率、原油黏度、渗吸液矿化度对渗吸过程的影响规律,认识不同因素对渗吸采油效率的影响。结合渗吸机理,通过渗吸速度、渗吸采收率的比较,发现一定范围内,界面张力为10-1mN/m数量级、较高渗透率、较低原油黏度、较高渗吸液矿化度条件下,表现出较好的渗吸效果。

By applying static imbibition test method to low permeability sandstone,the influences of interfacial tension,permeability,crude oil viscosity and imbibition fluid salinity on imbibition process are studied,and the influences of different factors on imbibition recovery efficiency are understood.Combined with imbibition mechanism,through the imbibition speed,imbibition recovery ratio comparison,it is found that within a certain range,the interfacial tension of 10-1mN/m order of magnitude,higher permeability,lower crude oil viscosity,higher imbibition fluid salinity can achieve better imbibition effect.