【摘要】 通过室内实验,研究了注CO2、N2、天然气后芳48 区块原油性质的变化。注气量越多,地层油高压物性变化越大。三种气体中注CO2地层油高压物性变化最大,其次为天然气,N2变化最小。注入气后原油物性的变化更有利于残余油饱和度降低,使原油更容易被采出,从而增加了地层原油采收率。更多还原

【Abstract】 The high-pressure physical properties for crude oil in Fang48 block after injecting CO2, N2 and natural gas through laboratory experiment are studied. The high-pressure physical properties for crude oil have changed after injection gas; the saturation pressure, formation volume factor and solution gas-oil ration of crude oil increase; viscosity decreases and volume of crude oil expands. The more the amount of injecting gas, the greater the variation of the high-pressure physical properties for crude oil. Among these variations the variation as injecting CO2 is the greatest, followed by natural gas, and N2 the smallest. The variation of the high-pressure physical properties for crude oil as injecting gas is advantageous to decrease residual oil saturation and produce oil easily, thus increasing oil recovery efficiency.更多还原