缝洞型底水油藏油井见水及含水规律实验研究

Physical Simulation Research of Water Breakthrough and Well Water Cut Performance in Fractured-vuggy Carbonate Reservoirs

针对塔河碳酸盐岩缝洞型底水油藏的特点,根据矿场生产的动静态资料,利用相似理论,构建不同缝洞组合的可视化模型,开展物理模拟实验。比较和验证了不同含水上升规律所对应的储集空间类型,揭示了不同含水上升规律的物理本质,为此类油藏的合理开发提供了必要的实验和理论依据。实验证实,碳酸盐岩缝洞型底水油藏油井见水和含水上升规律存在5种基本形态,而每一种类型都与特定的储集体地质特征、缝洞组合关系、水体能量的大小以及水体与储层的沟通程度密切相关;底水入侵的方式与砂岩油藏有很大区别,底水主要沿大裂缝窜进,溶洞内油水界面缓慢水平抬升,流体流动属于层流,这将简化管流与渗流耦合的数学模型。

Based on the characteristics of fractured-vuggy carbonate reservoirs in Tahe Oilfield as well as dynamic and static data from pilot production, visualized models of different combination of fractured and vuggy were built up through similar theory and forward modeling in this study. Comparison and verification of the reservoir space type of corresponding water cut law were done by physical simulation experiment. The result reveals the physical nature of water cut performance, and provides the experimental and theoretical basis for the efficient development of reservoir. The experiment simulation proves that there are five basic types of water cut performance in fractured-vuggy carbonate reservoirs. Each type is related to the specific reservoir geological characteristics, combination relations of vuggy and fracture, water energy and connection between aquifer and deposit. Compared to sandstone reservoirs, carbonate reservoirs have more complicated characteristics in water influx.The influx always happened in fractures and in the cave inside, and the oil-water interface levels up in horizontal position. The coupling of conduit flow and permeation is the direction of research in the future.