Abstract During the high water-cut period, water plugging treatment is a commonly selected development strategy to reduce the production decline rate. However, determination of the appropriate water-cut to implement water plugging is rarely studied and therefore it is often decided based on the experience of reservoir engineers, which could result in potential oil production loss and ineffective water plugging treatment. In this paper, an analytical model to predict water-cut increasing was derived and the increase in water-cut under different pressure drawdown multipliers was examined. Then, an approach to determine the critical water cut to apply plugging was proposed and the critical condition of water plugging in high water-cut formation was analyzed. Based on the sensitivity study conducted at different water-cut and different pressure drawdown multipliers, the lower oil viscosity leads to a lower critical plugging water cut, which implies that water plugging treatment might not be suitable for all types of reservoirs. Furthermore, this finding is practiced in actual oilfield extraction and the critical plugging water-cut calculation method does improve production performance. Thus, this analytical approach is capable to enhance oilfield production performance and optimize the effectiveness of water plugging.

中文翻译：

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堵水临界含水分析研究：控水增产

摘要 在高含水期，堵水处理是降低产量递减率的常用开发策略。然而，对于实施堵水的合适含水率的确定研究很少，因此往往根据油藏工程师的经验来决定，这可能导致潜在的石油产量损失和堵水处理无效。在本文中，推导了预测含水率增加的分析模型，并研究了不同压力下降乘数下含水率的增加。在此基础上，提出了确定封堵临界含水率的方法，分析了高含水地层封堵临界含水率的条件。基于在不同含水率和不同压降倍数下进行的敏感性研究，较低的石油粘度导致较低的临界堵水含水率，这意味着堵水处理可能不适用于所有类型的储层。此外，这一发现在实际油田开采中得到实践，临界堵塞含水计算方法确实提高了生产性能。因此，这种分析方法能够提高油田生产性能并优化堵水效果。这一发现在实际油田开采中得到实践，临界堵水含水计算方法确实提高了生产性能。因此，这种分析方法能够提高油田生产性能并优化堵水效果。这一发现在实际油田开采中得到实践，临界堵水含水计算方法确实提高了生产性能。因此，这种分析方法能够提高油田生产性能并优化堵水效果。