确定低渗透油藏启动压力梯度的新方法及应用

通过对江汉油田低渗透油藏20块不同渗透率岩心室内驱替实验,从流体在低渗透多孔介质渗流机理出发,对所得实验数据进行了处理,研究了一种求解启动压力梯度的新方法。通过对实验数据进行回归分析,得到低渗透油藏启动压力梯度与地层流度的关系式,并绘制了求解低渗透油田启动压力梯度的图版。利用实验所得到的回归关系式和求解启动压力梯度的图版,结合低渗透油田实际,进行应用,得到不同生产压差下确定极限注采井距的方法。

The new determination method and application of threshold pressure gradient in low permeability reservoir

A series of displacement experiments were carried out by using 20 different permeability cores of Jianghan oil field.Based on the mechanism of fluid flowing through porous media,the data are treated,and a new computing method is presented.According to the regression and analysis of the data,a mathematical equation is obtained between the threshold pressure gradient and the exponent of mobility of the low permeability reservoir,and some theoretical plates are attained for calculating the threshold pressure gradient of low permeability reservoirs.The obtained mathematical equation and the theoretical plates are applied to real low permeability reservoir,and theoretical methods are acquired for ascertaining the ultimate distance between production wells and injection wells in Jianghan oil field.All theoretical plates are quite practical for oil field engineering and engineers.Given some handy data,the needed index are easily gained from the theoretical methods.