考虑无效注水的合理注采比研究

Research on Reasonable Injection-Production Ratio Considering Invalid Water Injection

摘要: 注水开发油田一般是通过注采平衡来保证油井具有旺盛的生产能力，要实现注采平衡就必须有一个合理的注采比。但是油田在长期的注水开发之后，不可避免地会产生一部分无效注水，而某一时刻的无效注水比例是难确定。本文以物质平衡原理与Logistic旋回理论为基础进行了考虑无效注水的合理注采比的理论推导，同时推导出了确定无效注水比例的理论计算方法。基于实际Z油田的生产数据，对该油田的合理注采比进行了计算，并与应用油藏数值模拟方法确定出的Z油田的合理注采比进行了对比，验证了此方法的正确性，该方法对油田确定合理的注采比有一定的指导意义。

Abstract: Waterflooding oilfield usually needs injection-production balance to ensure production wells have a strong production capacity. In order to realize the injection-production balance, it must have a reasonable injection-production ratio. But in the long-term waterflooding oilfield, it will produce part of invalid water injection inevitably, and the proportion of invalid water injection at a certain moment is difficult to determine. Based on the material balance principle and the Logistic cycle theory, theoretical derivation of reasonable injection-production ratio considering of invalid water injection is established, and the theoretical calculation method of the invalid water injection rate is also derived. Based on the production data of actual Z oilfield, reasonable injection-pro- duction ratio of the oil field is calculated, and reasonable injection-production ratio of Z oilfield with application of reservoir numerical simulation method to determine has carried on the contrast, so validate the correctness of this method. This method to determine reasonable injection- production ratio of oilfield has certain guiding significance.