低渗储层试井压力解释新方法

A New Method for Well Test Interpretation of Low Permeability Reservoirs

长庆油田因其储层"三低"特征,采用常规试井解释时外推储层压力偏高。针对低渗透油藏的储层与生产特征,在进行试井解释时引入裂缝影响半径和裂缝影响面积2个概念,主要考虑裂缝及裂缝影响半径区域对试井曲线的影响,将双对数曲线上翘分为2个部分,前部分主要受到压裂和长时间生产后储层平面非均质性的影响,后部主要受到非达西渗流和启动压力梯度的影响,取得了良好的解释与应用效果。

Since the reservoir of Changqing Oilfield was characterized by the features of low permeability,low pressure and low-yield,when conventional test interpretation was performed,extrapolated reservoir pressure was higher than the true reservoir pressure.During test interpretation,two concepts of influencing radius and area were introduced in connection with low permeability and production characteristics of the reservoir,the impact of fracture and its radius area on the well testing curve was mainly considered,the upwards of double logarithmic curve were divided into two parts,the first part was mainly affected by fracturing and heterogeneity after a long plane production reservoir,the second part was mainly affected by non-Darcy flow and threshold pressure gradient.This method is used and good well test interpretation result is obtained.