用生产资料确定谢卡尔乔夫公式参数的方法

谢卡尔乔夫公式在井网密度影响采收率的计算中已得到广泛的应用 .在谢卡尔乔夫公式的参数中除了井网密度和采收率外 ,还有两个重要的影响参数即井网指数 a和水驱油效率 Ed 需要进一步确认 .简单介绍目前确定井网指数 a和水驱油效率 Ed 的常用方法 ,给出了一种用实际生产资料通过统计、拟合等一系列数学方法确定 a和 Ed 值的方法 ,从而使谢卡尔乔夫公式更接近实际情况 ,更具有实用价值

Calculating Displacement Efficiency and Well-pattern Index in B.H.Xie.'s Formula According to Actual Producing Data

The well-pattern density in heterogeneous waterflooding sandstone reservoir has direct influence on recovery factor. B.H.Xie.'s formula establishes the relationship between well-pattern density and recovery factor. There are two parameters in the formula, well-pattern index "a" and displacement efficiency "E d". The key to the use of the formula is to exactly calculate the two parameters. Three methods for calculating them: parameter analogy, experimental method and reservoir interrelated formula, are briefly introduced, and a method of determining the two parameters by the statistics and the fitting etc. of actual producing data is emphatically discussed. The method makes B.H.Xie.'s formula more practical. The calculated result of an example shows that, (1) when the values of the two parameters are determined by the method, the producing period of an oilfield should be longer and water cut must be greater than 30%, (2) the values of a and Ed calculated by this method are more practical, (3) the method is more suitable to large and medium oilfields than to small ones.