The pre-crosslinked gel particles has been perceived as an important alternative to improve oil recovery from fractured-vuggy carbonate reservoirs. However, it remains a great challenge for the applications in high temperature and high salinity reservoirs. In this context, we firstly developed novel preformed gel particles with controllable density (PGPCD) which can be used at high temperature (140 °C) and high salinity (250 g/L) fractured-vuggy carbonate reservoirs for in-depth profile control and displacement. Then, the swelling property, toughness, injectivity, EOR potential and EOR mechanisms of PGPCD were investigated. Experimental results show that PGPCD has favorable swelling ability, toughness, and controllable density due to the introduction of sodium montmorillonite and modified foamed acrylate rubber (ACM) powders. Moreover, PGPCD has favorable injectivity, and can mitigate water channeling in the form of “filling accumulation”, “bifurcation accumulation”, and “necked accumulation”. After the treatment, PGPCD achieves incremental oil recovery in a range of 16 % ∼ 26 % of original oil in place. Taken together, our findings suggest the role of PGPCD in promoting the incremental oil recovery at high temperature and high salinity reservoirs, especially in fractured-vuggy carbonate bottom water reservoirs.

预交联的凝胶颗粒被认为是改善裂缝型碳酸盐岩储层采收率的重要替代方法。然而，对于在高温和高盐度储层中的应用而言，仍然是一个巨大的挑战。在此背景下，我们首先开发了密度可控的新型预制凝胶颗粒（PGPCD），可在高温（140°C）和高盐度（250 g / L）的裂缝型碳酸盐碳酸盐储层中使用，以进行深度剖面控制和控制。移位。然后，研究了PGPCD的溶胀性，韧性，可注射性，EOR电势和EOR机理。实验结果表明，由于引入了蒙脱土钠和改性的泡沫丙烯酸酯橡胶（ACM）粉末，PGPCD具有良好的溶胀能力，韧性和可控制的密度。而且，PGPCD具有良好的注入性，并且可以以“填充堆积”，“分叉堆积”和“颈缩堆积”的形式缓解水流。处理后，PGPCD的采油量可提高到原来采油量的16％到26％。综上所述，我们的研究结果表明，PGPCD在促进高温和高盐度油藏中，尤其是在缝隙型碳酸盐岩底水油藏中的增量采油中的作用。