Natural polymers are widely used in different industries, mainly due to their hydrophilic features, which make it possible to solubilize them in water or absorb a large amount of it. Polysaccharides are the most widely used hydrophilic polymers, mainly because of their non-toxicity, biodegradability, compliance with environmental regulations and thickening behaviour in water. Knowledge of polymer performance in different aqueous media is essential to ensure optimal use in a desired application. In this study, the stability of sodium kappa-carrageenan and sodium carboxymethylcellulose stability was investigated in saline and basic aqueous media, as well as their applicability in drilling fluids. The ionic strength effects of the aqueous media containing Na⁺, Mg²⁺ and Ca²⁺ on the rheological properties of the polymer solutions were evaluated by varying the salt concentration, pH and temperature. The rheological properties and drilling fluid filtrate volume were evaluated by varying salt concentration and pH. The kappa-carrageenan solutions and drilling fluids were scarcely influenced by ion addition, at pH 7 to 10, even at higher salt concentrations, but highly influenced at pH > 11. On the other hand, carboxymethylcellulose solutions and their drilling fluids were more affected by the presence of salt and pH changes, with a greater decline in viscosity and increase in filtrate volume. This behaviour was interpreted as conformation adopted by the kappa-carrageenan chains in the presence of ions, indicating that this polymer is a good candidate for drilling fluids in oil well operations.

天然聚合物由于其亲水特性而广泛用于不同的行业，这使其可以将它们溶解在水中或吸收大量的水。多糖是使用最广泛的亲水性聚合物，主要是因为它们无毒，可生物降解，符合环境法规和在水中增稠的特性。了解聚合物在不同水性介质中的性能对于确保在所需应用中实现最佳使用至关重要。在这项研究中，研究了κ-角叉菜胶钠的稳定性和羧甲基纤维素钠在盐水和碱性水性介质中的稳定性，以及它们在钻井液中的适用性。含Na ⁺，Mg ²⁺和Ca ²⁺的水性介质的离子强度效应通过改变盐浓度，pH和温度来评估聚合物溶液的流变性能。通过改变盐浓度和pH来评估流变性质和钻井液滤液体积。在7至10的pH值下，即使在较高的盐浓度下，κ-角叉菜胶溶液和钻井液几乎不受离子添加的影响，但在pH> 11时，其影响很大。另一方面，羧甲基纤维素溶液及其钻井液受到的影响更大。盐和pH值的存在会发生变化，粘度下降幅度更大，滤液体积也会增加。这种行为被解释为是在离子存在下κ-卡拉胶链所采用的构象，表明该聚合物是油井作业中钻井液的良好候选者。