油井单层含水快速识别油藏工程方法研究

Research on a reservoir engineering method about quickly identification of single layer water cut

对于多油层非均质油藏,以精细地质资料为基础,通过注采物质平衡方程计算了注水井组中各层的注水劈分系数。基于径向渗流理论,建立了单层含水上升规律微分方程。通过对多层系统中基准层的选择,得到了各层含水率相对基准层含水率变化的微分方程,采用四阶Runge-Kutta方法求解了微分方程,得到了各层含水率与基准层含水率以及综合含水率的变化关系,从而形成了一套可以根据全井综合含水反求各单层含水的油藏工程方法。

Aiming at multilayer heterogeneous reservoir, based on fine geological information, through injection-production material balance equation, this paper calculated water injection dividing coefficient of each layer. According to radial filtration theory, this paper established differential equation of single layer water cut rising regularity. Through datum bed selection in multilayer system, we acquired differential equation, which was about water cut changes of each layer relative to datum bed. Differential equation was solved by adopting fourth order Runge-Kutta method, thereby obtaining water cut relations among single layer, datum bed and composite layer. Accordingly, a reservoir engineering method was obtained, which could acquire single layer water cut according to composite water cut.