注水正韵律油层水平井开采剩余油数值模拟研究──以五点注水井网为例

NUMERICAL SIMULATION OF PRODUCING REMAINING OIL FROM A POSITIVE RHYTHM RESERVOIR WITH HORIZONTAL WELLS AFTER WATERFLOODING

在垂直井注水开发的正韵津油层顶部往往留有大量剩余油，本文用数值模拟研究了在现有垂直井眼上侧钻超短半径水平井开来这些剩余油的效果。根据建立的地质模型和确定的水平井开采方案，用正交设计对９个地质开发因素进行了组合，并用多功能模型计算了２７个数值模拟方案。利用多元回归，分别从模拟计算结果得到计算正韵律油层垂直井采收率和计算用水平井开采剩余油提高采收率相对值的多元回归相关公式。结合经济分析应用这两个公式，可对正韵律油层利用水平井开采剩余油的可行性作出评价。

There is often an amount of remaining oil in the top of a positive rhythm reservoir after waterflooding with vertical well. Based on the results of numerical simulation, this paper studies the effect of producing the remaining oil by using side-tracked ultra-short radius horizontal wells in existing vertical wells. Twentyseven combinations of 9 geologic development factors are obtained with the orthogonal design method and then the 27 plans are calculated by using MURS, based on the model established in this paper. In light of multivariate regression, the relevant formula to calculate the recovery efficiency of vertical well and that to calculate the relative recovery efficiency of horizontal well in a positive rhythm reservoir are respectively obtanied from the results of numerical simulation, which, combined with economic analysis, can be used to make a feasibility study for producing the remaining oil in a positive rhythm reservoir with horizontal wells.