二次加密注水井分流机理及调整方法

随着二次加密井网开采时间的延长，井网本身反映出的问题越来越多，其中较为突出的是注水分流问题，该问题导致了二次加密油井受效差，动用程度低等诸多开发矛盾，因此，搞清楚二次加密井网注水分流问题，也就是后期调整提供了依据，通过双重各向异性介质的驱替特征建立的数学模型，分析了二次加密注水井注入水在没有满足本井网的前景下，向一次加密调整井网，基础井网生产井分流现象及其注水分流的微观机理，提出并实施了具体的调整办法，并取得了明显的效果，为二次加密井的进一步调整注水结构、提高动肜程度、改善开发效果提供了分析方法和调整手段。

Studies on the Split-stream Mechanism and Its Adjustment of Secondary Infill Wells

With the producing time passing,a secondary infill pattern itself is revealing some marked problems,among those the split stream of injected water is more predominant which results in so many obstacles in the oilfield development,such as poor waterflood efficiency and lower producible oil reserves,etc. Therefore,only if the problem of split stream has been made clearly, there will be a reliable base for its adjustment in later stage.This paper give a good example: upon a mathematical model built on the displacment characteristics of twofold anisotropic medium, it analyzed the performance of secondary infill wells which did not meet the requirement of the pattern, and gave solution to the split stream of the producers and the micro mechanism of the split stream of injected water in primary infill adjustment pattern and basic pattern, and implemented physical adjustments which achieved remarkable results.This proves that it can become an analysis method and adjustment means for further injection profile modification and higer producible oil reserves of the secondary infill wells, and for the improvement of the development.