低渗透非均质油藏动用程度评价新方法

A new evaluation method of producing degree for low-permeability heterogeneous reservoirs

根据低渗透非均质油藏的特点,分析了启动压力梯度、纵向非均质性、小层厚度和平面砂体厚度展布对该类油藏开发的影响。从势能叠加原理出发,推导出该类油藏小层有效驱动半径计算公式。根据该公式建立低渗透非均质油藏动用程度评价方法。实例分析表明,该方法具有预测精度高、简便和实用等优点,能为进一步有效开发低渗透非均质油藏提供一定的指导。

The influences of threshold pressure gradient, vertical heterogeneity, subzone thickness and areal sand thickness distribution on development of low-permeability heterogeneous reservoirs are analyzed. The calculation formula of effective drive radius is presented for subzones in low-permeability reservoirs based on potential energy superposition principle. Then a new evaluation method of producing degree is developed for low-permeability heterogeneous reservoirs. It has been verified by calculation example that this method has the advantages of high accuracy, practicality and availability, and provides convenience for further development of low-permeability heterogeneous reservoirs.