Abstract Xanthan gum is a biopolymer used in several different industries for a variety of applications. In the Petroleum Industry, xanthan gum has been applied in Enhanced Oil Recovery (EOR) methods for mobility control due to its Non-Newtonian rheological behavior, relative insensitivity to salinity and temperature compared to other conventional synthetic polymers, as well as its environmentally-friendly characteristics. As challenging reservoir conditions arise, candidate polymers should meet the screening factors for high salinity, high temperatures and heterogeneous reservoirs. This paper aims to evaluate the effects of temperature and monovalent salts on the rheological behavior of xanthan gum for Enhanced Oil Recovery purposes. We tested polymer solutions with brine salinities of 20,000/110,000/220,000 ppm of Sodium Chloride in a rheometer at temperatures of 23, 50, and 77°C. The results acquired showed that temperature plays a key role in viscosity and salinity protected the solution viscosity against negative thermal effects, unusually a turning point is observed where the increase in the monovalent salt content enhanced the polymeric solution viscosity. Such investigations coupled with a detailed discussion presented in the paper contribute to understand critical aspects of xanthan gum and its capability to provide basic requirements that fit desired screening factors for EOR.

中文翻译：

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浓度、盐水盐度和温度对黄原胶溶液流变学的影响

摘要 黄原胶是一种生物聚合物，用于多个不同行业的各种应用。在石油工业中，黄原胶由于其非牛顿流变行为、与其他常规合成聚合物相比对盐度和温度相对不敏感，以及其对环境友好，因此已被用于提高石油采收率 (EOR) 方法中的流动性控制特征。随着具有挑战性的储层条件的出现，候选聚合物应满足高盐度、高温和非均质储层的筛选因素。本文旨在评估温度和一价盐对黄原胶流变行为的影响，以提高采收率。我们测试了盐水盐度为 20,000/110,000/220 的聚合物溶液，在 23、50 和 77°C 的温度下，在流变仪中检测 000 ppm 氯化钠。获得的结果表明，温度在粘度中起着关键作用，盐度保护溶液粘度免受负面热影响，通常观察到一个转折点，其中一价盐含量的增加提高了聚合物溶液的粘度。此类调查与论文中提出的详细讨论相结合，有助于了解黄原胶的关键方面及其提供符合 EOR 所需筛选因素的基本要求的能力。通常观察到一个转折点，其中一价盐含量的增加提高了聚合物溶液的粘度。此类调查与论文中的详细讨论相结合，有助于了解黄原胶的关键方面及其提供符合 EOR 所需筛选因素的基本要求的能力。通常观察到一个转折点，其中一价盐含量的增加提高了聚合物溶液的粘度。此类调查与论文中的详细讨论相结合，有助于了解黄原胶的关键方面及其提供符合 EOR 所需筛选因素的基本要求的能力。