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首页> 外文会议>SPE Western Regional Meeting >Coupling Low Salinity Water Flooding and Preformed Particle Gel to Enhance Oil Recovery for Fractured Carbonate Reservoirs
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Coupling Low Salinity Water Flooding and Preformed Particle Gel to Enhance Oil Recovery for Fractured Carbonate Reservoirs

机译：耦合低盐水泛水和预成型颗粒凝胶，增强裂缝碳酸盐储层的采油

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摘要

The recovery of oil from carbonate reservoirs is usually low due to their extreme heterogeneity caused by natural fractures and the nature of the oil-wet matrix. Low salinity water flooding (LSWF) and preformed particle gels (PPGs) control conformance are two novel technologies that have recently drawn great interest by the oil industry. We developed a cost-effective, novel, enhanced oil recovery (EOR) technology for carbonate reservoirs by coupling the two technologies into one process. The objective of this paper is to provide a comprehensive understanding of the combined technology and to test through laboratory experiments the extent to which the coupling method can improve oil recovery. The laboratory experiments showed that the optimum water salinity for the application of the coupled method was 0.1 wt. % NaCl under experimental conditions. The water residual resistance factor (Frrw) increased as the water salinity and the fracture width decreased. The oil-wet carbonate cores provided a higher improved oil recovery than a water-wet carbonate cores during LSWF. The decrease in fracture width resulted in a higher oil recovery factor. Compared to traditional bulk gel treatments, PPG forms stronger plugging but will not form an impermeable cake in the fracture surface; therefore, PPG allows low salinity water to penetrate into the matrix to modify its wettability, thus producing more oil from the matrix. Results also show that oil recovery increased by 10 % during LSWF after the second waterflooding. Additionally, when PPG was injected, another 8 % of oil recovery was gained. As a result, combined the LSWF and PPG increased oil recovery by 18%. LSWF can increase only displacement efficiency but has little or no effect on sweep efficiency, while particle gels can plug fractures or in high-permeable channels to improve sweep efficiency but have little effect on displacement efficiency. The coupled method bypasses the limitations of each method when used individually and improve both the displacement and the sweep efficiency.
机译：由于自然骨折引起的极端异质性和油湿基质的性质，来自碳酸盐储层的油的回收通常是低的。低盐水泛水（LSWF）和预制粒子凝胶（PPG）控制一致性是最近由石油工业引起了极大兴趣的两种新技术。通过将两种技术耦合到一个过程中，我们开发了一种用于碳酸盐储层的具有成本效益，新颖，增强的采油（EOR）技术。本文的目的是提供对组合技术的全面了解，并通过实验室实验测试偶联方法可以改善溢油的程度。实验室实验表明，偶联方法的应用的最佳水伴是0.1重量％。实验条件下％NaCl。水残留的电阻因子（FRRW）随水盐度和裂缝宽度降低而增加。油湿碳酸盐芯在LSWF期间提供了比水湿碳酸碳酸核的更高改善的油回收。断裂宽度的降低导致更高的储油因子。与传统的散装凝胶处理相比，PPG形成更强的堵塞，但不会在骨折表面中形成不渗透的蛋糕;因此，PPG允许低盐水渗透到基质中以改变其润湿性，从而产生更多来自基质的油。结果还表明，在第二次水落后，LSWF期间的采油增加了10％。另外，当注射PPG时，获得另外8％的储存。结果，将LSWF和PPG组合增加了18％的油回收率。 LSWF可以增加位移效率，但对扫描效率几乎没有或没有影响，而颗粒凝胶可以插入裂缝或以高渗透通道堵塞以提高扫描效率，但对位移效率几乎没有影响。当单独使用并改善位移和扫描效率时，耦合方法绕过每个方法的局限性。

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