Abstract The oil recovery from fractured reservoirs is usually low, which is usually caused by the existence of areal formation heterogeneity. Two existing enhanced oil recovery (EOR) technologies, low salinity water flooding (LSWF) and preformed particle gel treatment (PPG), have recently drawn great interest from the oil industry. We integrated both of these technologies into one process to improve both oil displacement and areal sweep efficiency. The objective of this study was to test how the integrated method could be used effectively to increase oil recovery and control water production. The semi-transparent five-spot models, which were made of sandstone cores and acrylic plates, were built. We investigated the effect of four parameters on the improvement of oil recovery and areal sweep efficiency of oil, including gel strength, water salinity, injection rate, and number of fractures. Two approaches were followed during core flooding, sequential mode and mixed mode. The result shows that PPG and LSW injected together as one mixture improved oil recovery factor more than the first approach. PPGs plugged the fractures and successfully improved areal sweep efficiency; however, they have little effect on displacement efficiency. LWSF increased displacement efficiency but had little or no effect on sweep efficiency. The integrated methods bypassed the limitations of each method when used individually and improved both displacement and sweep efficiency.

中文翻译：

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通过在裂缝性油藏中整合预制颗粒凝胶和低矿化度水驱来提高面波及效率

摘要 裂缝性油藏采收率通常较低，这通常是由于区域地层非均质性的存在造成的。两种现有的提高采收率 (EOR) 技术，低盐度水驱 (LSWF) 和预制颗粒凝胶处理 (PPG)，最近引起了石油行业的极大兴趣。我们将这两种技术集成到一个过程中，以提高驱油和区域波及效率。本研究的目的是测试如何有效地使用集成方法来提高石油采收率和控制产水量。制作了由砂岩芯和亚克力板制成的半透明五点模型。我们研究了四个参数对提高石油采收率和石油区域波及效率的影响，包括凝胶强度、水盐度、注入速度和裂缝数量。在岩心驱油过程中采用了两种方法，顺序模式和混合模式。结果表明，PPG 和 LSW 作为一种混合物一起注入，比第一种方法提高了石油采收率。PPG 封堵了裂缝并成功提高了区域波及效率；然而，它们对置换效率几乎没有影响。LWSF 提高了置换效率，但对波及效率几乎没有影响。当单独使用时，集成方法绕过了每种方法的局限性，并提高了位移和波及效率。结果表明，PPG 和 LSW 作为一种混合物一起注入，比第一种方法提高了石油采收率。PPG 封堵了裂缝，成功提高了区域波及效率；然而，它们对置换效率几乎没有影响。LWSF 提高了置换效率，但对波及效率几乎没有影响。当单独使用时，集成方法绕过了每种方法的局限性，并提高了位移和波及效率。结果表明，PPG 和 LSW 作为一种混合物一起注入，比第一种方法提高了石油采收率。PPG 封堵了裂缝，成功提高了区域波及效率；然而，它们对置换效率几乎没有影响。LWSF 提高了置换效率，但对波及效率几乎没有影响。当单独使用时，集成方法绕过了每种方法的局限性，并提高了位移和波及效率。