Abstract In the current survey, a novel fluorocarbon-based wettability modifier chemical is proposed to alter the wettability of sandstone rock surface from liquid wetting to preferentially gas wetting condition. Several experimental tests describing wettability condition of the rock surface including static contact angle measurements, spontaneous imbibition and dynamic core flooding using water and n-decane fluids were conducted on untreated and treated sandstone rock to investigate the effect of the proposed chemical on surface wetting behavior. Adsorption of fluorinated chemical on sandstone surfaces was characterized using FTIR and SEM. Elemental analysis of rock surface after treatment was determined by EDX analysis and EDX map. After chemical treatment of sandstone thin section, contact angles of water and n-decane in air-liquid-rock system were altered from 0° and 0° to 151° and 101°, respectively. Spontaneous imbibition of water and n-decane as imbibing liquid fluids into the core sample saturated with dry air at room temperature on untreated and treated core showed that the ultimate amounts of liquid imbibitions were decreased to factors of 0.03 and 0.16 PV, demonstrating wettability alteration from strongly condensate-and water-wet to preferentially gas-wet condition, respectively. Also, the results of core flooding experiments demonstrated the improvement of liquid phase mobility as a result of treatment with proposed chemical fluid by factors of 3.85 and 3.5 for water and n-decane, respectively. The outcome of this integrated study proposes that fluorochemical agents can be considered as a promising candidate for possible field applications to alleviate both condensate and water blockage in gas condensate reservoirs by wettability alteration technique.

中文翻译：

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利用润湿性改变缓解凝析气井周围凝析油堵塞

摘要 在目前的调查中，提出了一种新型的碳氟化合物基润湿性改性剂化学品，以改变砂岩岩石表面的润湿性，从液体润湿到优先气体润湿状态。对未处理和处理过的砂岩岩石进行了几项描述岩石表面润湿性条件的实验测试，包括静态接触角测量、自吸和使用水和正癸烷流体的动态岩心驱替，以研究所提出的化学品对表面润湿行为的影响。使用 FTIR 和 SEM 表征砂岩表面对氟化化学品的吸附。通过EDX分析和EDX图确定处理后岩石表面的元素分析。砂岩薄片化学处理后，气-液-岩体系中水和正癸烷的接触角分别从0°和0°变为151°和101°。水和正癸烷作为液体流体吸收到未处理和处理过的岩心上的室温下用干燥空气饱和的岩心样品中的自吸吸液表明，液体吸液的最终量降低到 0.03 和 0.16 PV 的因子，表明润湿性从分别为强冷凝水和水湿至优先气湿条件。此外，岩心驱替实验的结果表明，由于使用建议的化学流体处理水和正癸烷，液相流动性分别提高了 3.85 和 3.5。