碳酸盐岩低盐/工程水与聚合物混合注入地球化学建模新认识

E. Al-Shalabi, W. Alameri
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摘要

几十年来,聚合物驱被证明是最有效的提高石油采收率(EOR)的方法之一。此外,低矿化度/工程注水技术(LSWI/EWI)在过去几年中也得到了发展。这两种技术似乎都比其他EOR方法更便宜。这增加了作业者对这些技术的兴趣。此外,与地层流体相比,低矿化度水的粘性通常较低,这保证了较低的体积扫描效率,特别是在高温和高度非均质地层中。宏观波及效率的降低影响了低矿化度水对采收率的提高。此外,实验研究表明,在低盐度的水中,聚合物粘度显著提高。在本研究中,对混合聚合物和LSWI/EWI在混油润湿性、高温、高矿化度和低渗透率条件下的驱油性能进行了数值评价。利用商用成分模拟器建立了数值一维模型。该模型捕获了一种新开发和商用合成聚合物的聚合物流变学。同时,研究了LSWI/EWI对聚合物流变性能和性能的影响。在海水、聚合物和低矿化度注水循环中,采收率、压降和原位饱和度数据都是匹配的。利用匹配的实验数据,考察了油藏流动条件下聚合物与低矿化度水复合对线性模型微观驱替效率提高的影响。模拟结果表明,混合聚合物与LSWI/EWI是一种可行的恶劣条件下碳酸盐岩储层提高采收率方法。此外,该研究为恶劣条件下LSWI/EWI与聚合物驱在碳酸盐岩中的混合应用、低矿化度水对原位聚合物流变性的影响提供了新的见解,并促进了LSWI/EWI混合聚合物在油田规模上的进一步应用,以提高体积扫描效率和整体采收率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
New Insights into Geochemical Modeling of Hybrid Low Salinity/Engineered Water and Polymer Injections in Carbonates
For decades, polymer flooding proved to be one of the most effective enhanced oil recovery (EOR) methods. In addition, low salinity/engineered water injection (LSWI/EWI) has been gaining momentum over the last few years. Both techniques seem to be cheaper than other EOR methods. This resulted in an increased interest among operators in these techniques. Moreover, low-salinity water is usually less viscous compared to formation fluids, which warrants a lower volumetric sweep efficiency, especially at high temperatures and in highly heterogeneous formations. The reduction in macroscopic sweep efficiency impairs the improvement in recovery efficiency by low-salinity water. In addition, experimental studies showed that polymer viscosity is considerably improved in less saline water. In this study, hybrid polymer and LSWI/EWI flooding performance is numerically evaluated in carbonate formations under conditions of mixed-to-oil wettability, high temperature, high salinity, and low permeability. A numerical 1D model was constructed using a commercial compositional simulator. The model captures the polymer rheology of a newly developed and commercially available synthetic polymer. Also, the effect of LSWI/EWI on polymer rheology and performance was studied. Oil recovery, pressure drop, and in-situ saturation data were history matched for seawater, polymer, and low salinity water injection cycles. Furthermore, the matched experimental data were utilized to examine the combined polymer and low salinity water effect on the improvement in microscopic displacement efficiency of linear models under reservoir flow conditions. The simulation results showed that hybrid polymer and LSWI/EWI is a viable EOR method for carbonate reservoirs under harsh conditions. Moreover, this work provides new insights into the hybrid application of LSWI/EWI and polymer flooding in carbonates under harsh conditions, the impact of low-salinity water on in-situ polymer rheology, and it promotes further field-scale applications of hybrid polymer-LSWI/EWI to improve volumetric sweep efficiency and overall recovery efficiency.
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