Ma Zhenfeng, Zhao Mingwei, Yang Ziteng, Wang Xiangyu, Dai Caili
National Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China.
Shandong Key Laboratory of Oilfield Chemistry, China University of Petroleum (East China), Qingdao 266580, China.
Gels. 2023 Sep 7;9(9):726. doi: 10.3390/gels9090726.
To expand the applicability of gel fracturing fluids in ultra-high-temperature reservoirs, a temperature-resistant polymer was synthesized using the solution polymerization method. Subsequently, an ultra-high-temperature-resistant polymer gel was formulated by incorporating an organic zirconium crosslinking agent. A comprehensive investigation was carried out to systematically study and evaluate the steady shear property, dynamic viscoelasticity, and temperature and shear resistance performance, as well as the core damage characteristics of the polymer gel. The obtained results demonstrate that the viscosity remained at 147 mPa·s at a temperature of 200 °C with a shear rate of 170 s. Compared with the significant 30.9% average core damage rate observed in the guanidine gum fracturing fluid, the core damage attributed to the polymer gel was substantially mitigated, measuring only 16.6%. Finally, the gelation mechanism of the polymer gel was scrutinized in conjunction with microscopic morphology analysis. We expect that this study will not only contribute to the effective development of deep and ultradeep oil and gas reservoirs but also furnish a theoretical foundation for practical field applications.
为了扩大凝胶压裂液在超高温油藏中的应用范围，采用溶液聚合法合成了一种耐高温聚合物。随后，通过加入有机锆交联剂配制了一种超耐高温聚合物凝胶。开展了全面的研究，以系统地研究和评估聚合物凝胶的稳态剪切性能、动态粘弹性、耐温耐剪切性能以及岩心伤害特性。所得结果表明，在温度为200℃、剪切速率为170 s时，粘度保持在147 mPa·s。与胍胶压裂液中观察到的30.9%的显著平均岩心伤害率相比，聚合物凝胶造成的岩心伤害显著减轻，仅为16.6%。最后，结合微观形态分析对聚合物凝胶的成胶机理进行了研究。我们期望这项研究不仅有助于深层和超深层油气藏的有效开发，也为实际现场应用提供理论基础。
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