适用于缝洞型油藏的自修复预交联凝胶的制备与性能评价

Preparation and Performance Evaluation of Self-recovery Pre-crosslinked Gel in Fractured-vuggy Reservoir

侯吉瑞 吴伟鹏 李亚凯 屈鸣 张炜 吴文明 闻宇晨

HOU Jirui WUWeipeng LI Yakai QU Ming ZHANGWei WUWenming WEN Yuchen

为了解决高温高矿化度塔河油田缝洞型碳酸盐油藏的高含水率问题，研发出一种耐高温（140 ℃）和耐超高 矿化度（240 g/L）的自修复预交联凝胶（SPG），可直接使用高矿化度水将改性HPAM、六亚甲基四胺、邻苯二酚和 硫脲等溶解，加入无机物CCH提高稳定性。考察了SPG的流变性能、微观结构及对裂缝岩心封堵效果。研究结 果表明，该凝胶体系的三维网状结构更饱满紧密，脱水周期延长；凝胶初始黏度为77.1 mPa·s，成胶后强度可达 H—I 级，30 d 内脱水率仅为5%，对裂缝岩心的封堵率在90%以上。SPG体系具有良好的注入性、抗剪切性和抗 冲蚀性，在裂缝发育充分的缝洞型碳酸盐岩储层中具有应用潜力。

In order to solve the problem of high water cut in Fractured-vuggy carbonate reservoirs of Tahe oilfield with high temperature and high salinity，a novel self-recovery pre-crosslinked gel（SPG）with excellent resistance to high temperature（140 ℃） and ultra-high salinity（240 g/L）had been developed through dissolving HPAM，methenamine and hydroquinone thiourea in high salinity brine，and inorganic CCH was added to improve stability. Rheological properties and microstructure of SPG had been characterized，while plugging performance of gel was measured using cubic fractured core. Results showed that 3D network structure of bulk gel system was fuller and tightness，the period of dehydration was extended. The initial viscosity of SPG was 77.1 mPa·s，and the strength of bulk gel system could be stabilized at the H—I level，the dehydration rate of bulk gel system was only 5% within 30 days. The plugging rate of cubic fracture core was above 90%. The SPG had good injection，shear resistance and erosion resistance，exhibiting application potential in fracture-vuggy carbonate reservoirs with fully-developed fractures.

10.19346/j.cnki.1000-4092.2022.04.008