Liu Peng, Dai Caili, Gao Mingwei, Wang Xiangyu, Liu Shichun, Jin Xiao, Li Teng, Zhao Mingwei
Shandong Key Laboratory of Oilfield Chemistry, Department of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China.
Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China.
Gels. 2022 Sep 20;8(10):600. doi: 10.3390/gels8100600.
In order to broaden the application of clean fracturing fluid in ultra-high temperature reservoirs, a surfactant gel for high-temperature-resistant clean fracturing fluid was developed with a gemini cationic surfactant as the main agent in this work. As the fracturing fluid, the rheological property, temperature resistance, gel-breaking property, filtration property, shear recovery performance and core damage property of surfactant gel were systematically studied and evaluated. Results showed the viscosity of the system remained at 25.2 mPa·s for 60 min under a shear rate of 170 s at 200 °C. The observed core permeability damage rate was only 6.23%, indicating low formation damage after fracturing. Due to micelle self-assembly properties in surfactant gel, the fluid has remarkable shear self-repairability. The filtration and core damage experimental results meet the national industry standard for fracturing fluids. The gel system had simple formulation and excellent properties, which was expected to enrich the application of clean fracturing fluid in ultra-high temperature reservoirs.
为拓宽清洁压裂液在超高温油藏中的应用，本文以 Gemini 阳离子表面活性剂为主剂，研制了一种耐高温清洁压裂液用表面活性剂凝胶。作为压裂液，系统研究并评价了表面活性剂凝胶的流变性能、耐温性能、破胶性能、滤失性能、剪切恢复性能及岩心伤害性能。结果表明，该体系在 200℃、170 s-1 剪切速率下，60 min 内黏度保持在 25.2 mPa·s。岩心渗透率伤害率仅为 6.23%，表明压裂后地层伤害低。由于表面活性剂凝胶中的胶束自组装特性，该流体具有显著的剪切自修复能力。滤失和岩心伤害实验结果符合压裂液的国家行业标准。该凝胶体系配方简单、性能优良，有望丰富清洁压裂液在超高温油藏中的应用。
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