多层油藏层系重组开发指标预测方法

层系重组是水驱油藏开发后期提高采收率的一项重要技术,不同的层系重组方式对应的开发效果不同,层系重组后的开发指标预测对层系重组优化起着重要的作用。基于油水两相不稳定渗流理论,建立了层系重组后的开发指标计算方法,采用隐式差分法进行压力求解,采用B-L方程计算饱和度分布。计算中考虑了储层物性参数和地层原油黏度的变化;并以注采井间各小层的渗流阻力和注采压差为权重进行单井各层产量的分配。该方法可以计算任意层系组合下的开发指标,对水驱油藏层系组合优化具有重要的指导意义。

Development index prediction methodof layers recombination in multi-layer reservoirs

Layers recombination is one important technique to improve the oil recovery of water drive reservoir during the high water cut stage. And the different recombination mode can lead to different development result. Development index prediction plays a vital role in the optimization of multi-layer reconstruction. Based on the two-phase unstable flow theory of oil and water, the development index prediction method of multi-layer combination is established, The solution of pressure equation is obtained by the implicit difference equation. And the water saturation is calculated by the flow streamline model. In the process of calculation the changes of reservoir parameters are taken into consideration, and the filtration resistance and production pressure drop between the oil and water wells is taken as the weighting coefficient in the allocation of well productivity. By using this method the development index can be calculated for the arbitrary layer combination. This research has important instructive meaning for the optimization of multi-layer recombination.