鱼骨状分支水平井注采配置优化

Optimization study on injection-production pattern of fish-bone branched horizontal wells

针对鱼骨状分支水平井注采配置关系,对鱼骨状分支水平井复杂的注采特征进行了研究,并根据微单元划分的思想,结合注采微单元水驱效果差异,确定五点井网是最适宜的鱼骨状分支水平井基础井网。在此基础上按照发挥有利微单元、调整不利微单元、实现均衡驱替的原则,从调整鱼骨状分支水平井井形参数和注采关系2方面,系统研究了改善注水开发效果的调配方向。根据优化结果,按照不规则鱼骨状分支水平井面积井网的整体静态规则化和不均衡注采参数的整体动态均衡化的原则,提出基于五点井网的3种井网优化调整对策,建立了合理的整体开发不规则面积井网模式。预测结果显示,3种调整策略都可以有效地改善鱼骨状分支水平井注采井网的注水开发效果。

For the injection-production pattern of fish-bone branched horizontal wells,the complex characteristics of injection and production are studied herein.Following the idea of micro-unit division and the water flood performance differences within them,we determine that the five-spot well pattern is the most suitable for the injection-production well pattern of fish-bone branched horizontal wells.Based on this study,under the principle of taking advantage of favorable micro-unit and adjusting the unfavor-able micro-unit so as to reach the balanced flooding,we implemented the study of adjusting method on improving the water flood performance by adjusting the well-shape parameters and injection-production relations.According to the optimization results and the principle of regularization for the fish-bone branched horizontal well pattern and uniformity of the injection-production param-eters,three kinds of adjustment treatments for well pattern optimization are put forward on the basis of five-spot pattern,and the reasonable irregular area well pattern for the entire development.The prediction results show that these three kinds of adjustment treatments can improve the performance of water injection development effectively for the injection-production well pattern offish-bone branched horizontal wells.