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利用高压相平衡实验装置 ,对某油田F6 6A井和F30井的原油在油藏温度下注入不同量的CO2 (注入CO2 与油藏流体的摩尔比为 0～ 2 .0 0 )时的PVT关系进行了测定 ,共取得PVT数据点 16 5个 ,泡点压力点和体积系数点各 11个。实验结果表明 ,由于原始油样的组分结构和组成不同 ,其注气体系相行为有较大的不同。F6 6A井油藏原油的饱和 (泡点 )压力随着CO2 注入量的增加近似呈线性增加 ,而F30井的饱和压力和CO2 注入量之间呈二次曲线关系 ,上升速度比F6 6A井缓慢 ,注气体系的体积系数的增加速度与CO2 注入量近似呈直线关系。对油藏流体中各组分进行适当组合合并为假组分后 ,用PR和SRK状态方程对所测注CO2 原油体系的相行为进行了预测。结果表明 ,PR状态方程的预测精度优于SRK方程 ,但两者均不能用于计算高CO2 注入量时油藏流体的相行为
Using the high-pressure phase equilibrium experimental apparatus, the PVT relationship of different amount of CO2 injected into the reservoir of F6 6A well and F30 well in oilfield at reservoir temperature (the molar ratio of injected CO2 to reservoir fluid is 0-2.0) A total of 165 PVT data points, 11 bubble pressure points and 11 volumetric volume points were obtained. The experimental results show that due to the different composition and composition of the original oil sample, the behavior of gas injection system is quite different. The saturation (bubble point) pressure of crude oil in well F6 6A increases linearly with the increase of CO2 injection, while the saturation pressure of F30 well shows a quadratic curve with CO2 injection rate, and the increase rate is slower than that of well F6 6A , The rate of increase of the volumetric coefficient of gas injection system is approximately linear with the amount of CO2 injection. After proper combination of the components of the reservoir fluid into the pseudo-components, the phase behavior of the measured CO2 crude oil system is predicted by the PR and SRK equation of state. The results show that the predictive accuracy of the PR state equation is better than that of the SRK equation, but neither of them can be used to calculate the phase behavior of reservoir fluids at high CO2 injection rates