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Experiments on water flooding in fractured-vuggy cells in fractured-vuggy reservoirs

机译：缝洞型水库缝洞单元水驱实验

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摘要

Based on the theory of scaling criteria, a physical experimental model of fractured-vuggy cell which meets the geometric similarity, kinematic similarity, dynamic similarity and characteristic parameters similarity was designed. The factors affecting fluid flow and water flooding characteristics, and the EOR features of different displacing modes were studied by experiments. The experimental results show that: Oil and water displacement effect caused by the density difference between oil and water is the main mechanism of water flooding; Injection rate has no effect on the remaining oil and water-cut; Fracture-vuggy connection is the dominant factor controlling water-free recovery, ultimate limit of remaining oil and water-cut variation in the fractured-vuggy cell; Oil-water viscosity ratio has an important effect on oil production rate, oil replacement ratio and economic limit remaining oil; When the filling degree is low, it has no effect on remaining oil, but when the filling degree is high, the remaining oil contains both “attic oil” and the oil existing in porous media; Foam flooding after water flooding enhances oil recovery by starting the attic oil at the top of vugs, and the remaining oil is in the center of the vugs after foam flooding; Polymer flooding after water flooding enhances the economic limit recovery by increasing the oil production rate and oil draining ratio, but it has no effect on the limit remaining oil of water flooding.
机译：基于尺度准则理论，设计了满足几何相似度，运动学相似度，动态相似度和特征参数相似度的裂孔细胞物理实验模型。通过实验研究了影响流体流动和注水特征的因素，以及不同驱替方式的EOR特征。实验结果表明：油水密度差引起的油水驱替作用是驱油的主要机理。注入速率对剩余的油和含水率没有影响;缝洞连接是控制无水采收率，控制缝洞单元中剩余油的最终极限和含水率变化的主要因素。油水粘度比对产油率，换油比和剩余油经济极限有重要影响;当填充度低时，它对剩余油没有影响，但是当填充度高时，剩余油既包含“阁楼油”又存在于多孔介质中。注水后的泡沫驱油通过在小孔顶部开始注入阁楼油来提高油的采收率，泡沫注水后剩余的油位于小孔的中央;注水后的聚合物驱油通过提高产油率和排油率来提高经济极限的恢复率，但对注水极限油剩余量没有影响。

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