注采井网生产井含水率解析计算方法

An analytical method for calculating water cut of producers in injection-production pattern

研究了一种对注采井网水驱前缘突破前后流线分布和生产井含水率的解析计算方法。利用过渡平面和多重施瓦茨-柯里斯托弗变换建立注采井网单元的复势分布,据此描绘出不同时刻井网单元内流线分布。根据井网单元的流线分布特征来计算生产井含水率,得到注采井网水驱前缘突破后生产井含水率随时间和注水倍数变化曲线。含水率对流线条数敏感性分析结果显示,流线条数越少,含水率上升越快,并优选了流线条数方案。该解析方法可用于油藏工程中注采井网注采参数的解析计算。

An analytical method was developed for calculating the streamline distribution and water cut of a producer in the injection-production pattern before and after the breaks of flooding front.The potential distribution of the injection-production pattern was obtained with the Schwarz-Christoffel transformation method.An upper half plane was introduced,and all streamlines within the well pattern were drawn.Based on the streamline distribution,the water cut curve of a producer in the well pattern changing with time and pore volume was obtained after the breakthrough of flooding front.The sensitivity analysis of water cut to streamline numbers showed that the less streamline numbers could result in the faster rising of water cut.The optimized streamline program was selected.The analytical method can be helpful for analytically calculating the parameters of production and injection in the injection-production pattern.