Enhanced oil recovery (EOR) has been one of the favorable methods in improving oil recovery and extending the production time. One of the techniques used in enhanced oil recovery (EOR) is gas flooding, because of the gases sweeping ability to displace the oil into the production well. Unfortunately, the gas injection method causes severe gas fingering because of the higher mobility and lower viscosity and density of the gas, compared to oil, which creates uneven fluid dispersion (fingering). Thus, a stabilized surfactant foam is introduced to control the injected gas mobility. This paper aims to characterize how the blends of non-anionic and anionic surfactants could act as foam stabilizing agents and to provide a brief exploration on their ability to improve the gas flooding process. The foamability and foam stability of single and mixed surfactant were tested at ambient and elevated temperature; additionally, a salt tolerance study was performed to identify the capability of the foam to withstand real reservoir conditions. Two anionic surfactants: sodium dodecyl sulphate (SDS) and alpha olefin sulfonate (AOS) and one non-ionic surfactant, octyl phenol ethoxylate (TX-100), were used in the study. Each single surfactant was tested for its viscosity and surface tension at the air/water interface under ambient conditions and compared with the mixed surfactants. Data has shown that blending of anionic and non-ionic surfactants has contributed to lower IFT compared to the individual surfactants and to increase viscosity, which is an early indicator of good foam stabilizer for foam flooding, which may lead to oil recovery improvement. The mixture of non-ionic and anionic surfactants, particularly TX-100 and AOS, showed better foamability and foam stability at elevated temperature than the individual pure surfactants.

中文翻译：

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用于提高石油采收率的阴离子-非离子表面活性剂混合物的表征

提高石油采收率（EOR）一直是提高石油采收率和延长生产时间的有利方法之一。用于提高石油采收率 (EOR) 的技术之一是气驱，因为气体吹扫能力可以将石油置换到生产井中。不幸的是，与石油相比，气体注入方法会导致严重的气指，因为与石油相比，气体具有更高的流动性和更低的粘度和密度，这会产生不均匀的流体分散（指称）。因此，引入了稳定的表面活性剂泡沫以控制注入的气体流动性。本文旨在表征非阴离子和阴离子表面活性剂的混合物如何充当泡沫稳定剂，并简要探讨它们改进气驱工艺的能力。在常温和高温下测试了单一和混合表面活性剂的起泡性和泡沫稳定性；此外，还进行了耐盐性研究，以确定泡沫承受实际油藏条件的能力。研究中使用了两种阴离子表面活性剂：十二烷基硫酸钠 (SDS) 和α-烯烃磺酸盐 (AOS) 以及一种非离子表面活性剂辛基苯酚乙氧基化物 (TX-100)。在环境条件下测试每种单一表面活性剂在空气/水界面处的粘度和表面张力，并与混合表面活性剂进行比较。数据表明，与单独的表面活性剂相比，阴离子和非离子表面活性剂的混合有助于降低 IFT 并增加粘度，这是泡沫驱良好泡沫稳定剂的早期指标，这可能会导致石油采收率提高。非离子和阴离子表面活性剂的混合物，特别是 TX-100 和 AOS，在升高的温度下表现出比单独的纯表面活性剂更好的起泡性和泡沫稳定性。