基于计算方法的地层油注气后相态特征

Phase state characteristic after gas injection into formation oil based on computational method

基于计算方法确定地层油注气后的相态特征,成本低、速度快.给出了地层油相态图的计算、绘制流程和参数确定方法,研究了大庆油田芳48断块油藏注气对地层油相态及高压物性的影响.结果表明,注入天然气可增大地层油的体积系数,降低油的黏度,使原油的饱和压力升高;随地层油中气体摩尔分数的增加,p-T相态图临界点左移,相态图左移,两相区面积增大,液相区面积变小,有利于实现气体混相驱,提高原油采收率.

After the computational method determination of initial oil in place gas injection phase state characteristic,the cost is low,the speed is high.We have produced the stratum phase state chart computation,the plan flow and the parameter determination method has studied the fragrant 48 fault blocks oil deposit gas injection to the initial oil in place phase state and the high-pressured natural influence.The result indicated that,pours into the natural gas to be possible to increase the initial oil in place the volume coefficient,reduces the oil the viscosity,causes the crude oil the saturation pressure to elevate;Along with the initial oil in place in the gas mole of score increase,p the T phase diagram critical point shifts to the left,the phase diagram shifts to the left,two areas area increase,the liquid phase area is small,is advantageous mixes in the realization gas drives,to enhance the crude oil recovery ratio.