三重介质油藏非牛顿液不稳定渗流压力变化特征研究

The Characteristic of Transient Pressure of Non-Newtonian Fluid′s Transient Flow in Triple-Media Reservoirs

文章对缝洞型碳酸盐岩油藏中非牛顿流体渗流时的压力动态特征进行了求解和特征分析,对比了非牛顿流体和牛顿流体的差别,并对影响压力动态的参数,如幂律流指数、表皮系数、弹性储容比以及窜流系数和外边界条件等进行了分析。结果表明,非牛顿流体的压力及压力导数都明显高于牛顿流体;幂律流指数越小则压力和压力导数越大;表皮系数和非牛顿流体幂律流指数对压力响应的影响有着明显的不同;而弹性储容比和窜流系数的影响和普通三重介质相同,只是由于非牛顿流体的影响其“凹陷”的位置升高;外边界的影响也和牛顿流体的情况明显不同。

The paper described the fluid flow of heavy oil in triple-media reservoirs and analyzed the characteristic of transient pressure.The pressures of newtonian fluid and non-newtonian fluid were compared and the sensitivity of parameters such as power index,skin factor,storativity ratio,inter-porosity flow factor and outer-boundary were analyzed .The results showed that the pressure and pressure derivative of non-newtonian fluid is higher than newtonian one;The power index is more smaller,the pressure and pressure derivative is more higher ;The effect of skin factor on transient was different from that of power index ;The storativity ratio and inter-porosity flow factor is just same as the newtonian fluid,and the effect of outer-boundary on transient pressure is different from that of newtonian fluid.