基于吸水剖面资料的油藏层间平均剩余油饱和度计算方法

层间采出程度差异大是多层合采油藏在高含水期面临的主要问题之一,正确认识层间采出程度状况对开发措施的制定具有重要的指导意义。吸水剖面资料是反映层间吸水状况差异的重要信息,分层吸水量的差异主要受各小层的储层物性和剩余油饱和度的差异影响。利用吸水剖面资料,以水电相似原理和非活塞式水驱油理论为基础,建立了多层合采油藏各小层平均剩余油饱和度的计算方法,并将计算结果与油藏数值模拟结果进行对比,两者的相对误差小于5%。

A new calculation method of inter-layer average remaining oil saturation based on water injection profile

High degree of reserve recovery disparities between layers is one of the main issues in multi-layer commingled reservoir at high water-cut stage. A correct understanding of inter-layer recovery degree has important guiding significance in making development decisions. Water injection profile data are important information that reflecting water injective behavior in different layers. Differences of water absorption capacity between different layers are mainly affected by reservoir petrophysical properties and remaining oil saturation. Based on hydropower similarity principle and non-piston type water displacing theory, a calculation method of inter-layer average remaining oil saturation in multi-layer commingled reservoir was established using water injection profile data. According to the results of numerical simulation, the relative error of the calculated results based on this method is less than 5%.