Abstract In this work, an experiment-based rheological model that accounts for the influence of polymer concentration, shear-thinning behavior, and temperature variation on the in-situ viscosity of gelled acid is developed. On the basis of the rheological model, we present a thermal–hydrologic–chemical coupled model that describes the dissolution process of carbonate acidization with gelled acid. A sensitivity analysis of the dissolution dynamic regarding the temperature variation, polymer adsorption, and non-Newtonian behavior of the injected acid is carried out. The comparison of acidization curves and dissolution patterns obtained by injecting gelled acid and HCl is conducted. It is found that the optimal dissolution regime for gelled acid has a much wider range than neat HCl. It is observed from the numerical simulations that reservoir temperature and rheological parameters of the acid are key factors that affect acidizing efficiency, while the effect of polymer adsorption can be ignored. In addition, several recommendations for optimal stimulation of carbonates with gelled acids are provided.

中文翻译：

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基于热-水文-化学耦合模型的胶凝酸酸化碳酸盐的数值研究

摘要 在这项工作中，开发了一种基于实验的流变模型，该模型考虑了聚合物浓度、剪切稀化行为和温度变化对胶凝酸原位粘度的影响。在流变模型的基础上，我们提出了一个热-水-化学耦合模型，该模型描述了碳酸盐用凝胶酸酸化的溶解过程。对关于温度变化、聚合物吸附和注入酸的非牛顿行为的溶解动力学进行了敏感性分析。对注入凝胶酸和 HCl 获得的酸化曲线和溶解模式进行了比较。发现胶凝酸的最佳溶出度范围比纯 HCl 宽得多。数值模拟表明，储层温度和酸的流变参数是影响酸化效率的关键因素，而聚合物吸附的影响可以忽略不计。此外，还提供了一些用胶凝酸对碳酸盐进行最佳刺激的建议。