水驱驱替特征系列修正及油水渗流特征方程确定

Series modification of water drive displacement characteristics and oil-water seepage characteristics equation determination

在凸型、S型、凹型及Gao-1含水变化规律的基础上,重新构建了水驱驱替特征系列。在新的驱替特征系列中,S-凸型含水变化规律在参数n为0和1时可分别转化为S型和凸型含水变化规律,S-凹型含水变化规律在参数m为0和1时可分别转化为S型和凹型含水变化规律,且各含水变化规律均有对应的水驱特征曲线,克服了原驱替特征系列中凹型和S-凹型含水变化规律无对应水驱特征曲线的缺陷;同时,进一步推导了5种含水变化规律的油水渗流特征方程。实例应用表明,新驱替特征系列的效果较好。

On the basis of water cut change laws of convex type, S type, concave type and Gao-1 type, the displacement series of water drive is reconstructed. In the new displacement series, when n is 0 and 1, the S-convex type water cut change rule can be transformed into S type and convex type respectively, and when m is 0 and 1, the S-concave type water cut change law can be transformed into S type and concave type respectively. And each water cut change law has corresponding water drive characteristic curve, which overcomes the defect that the concave and S-concave water cut change law has no corresponding water drive characteristic curve in the original displacement series;at the same time, the seepage characteristic equations of five water cut change laws are further derived. The application example shows that the effect of the new displacement characteristics series is good.