基于油藏井间连通性识别优势通道的新方法

A New Method of Identifying Dominant Channels Based on Interwell Connectivity

优势通道的发育导致油田开发效果变差,如何快速有效地识别优势通道是中高含水期油田开发中亟待解决的问题之一,为此,提出了基于油藏井间动态连通性定量识别优势通道的方法。根据时间顺序选择不同时间段的注采开发数据,利用连通性模型分别计算各个时间段内注采井间的动态连通系数,并计算井组内动态连通系数的变异系数,进而通过比较同一注水井组在不同时间段动态连通系数变异系数的变化趋势,实现单井组优势通道的定量识别。变异系数呈变大趋势,则井组内注入水流向差异变大,优势通道发育的程度增大。利用数值模拟方法对新方法进行了可靠性验证。将该方法应用于BZ油田某区块,对于油田后续调整提供了技术支持。

The growth of dominant channel leads to poor development effect of oilfield.How to identify the dominant channel quickly and effectively is one of the problems existed in oilfield development of medium high water cut stage.To solve this problem,this paper puts forwards a new method of quantitative identification of dominant channels based on interwell dynamic connectivity.Different time periods of oilfield development data is selected according to the time order,the capacitance-resistance model is used to calculate injection production dynamic interwell connectivity coefficient in each period of time,and also calculate the coefficient of variation of dynamic connectivity coefficient within the well group.Then the change trends of the coefficient of variation of dynamic connectivity coefficient in different time periods are compared to achieve the quantitative identification of single well group.When the coefficient of variation becomes larger,the injected water flow in the well group becomes larger,and the development of the dominant channel increases.The reliability of the method is verified by numerical simulation method.The method is applied to a block of BZ Oilfield,which provides technical support for subsequent adjustment in this oilfield.