Surfactant flooding is a chemical enhanced oil recovery (cEOR) process wherein anionic, cationic, non-ionic, and amphoteric surfactants are injected into oil reservoirs to produce more hydrocarbon. These chemical and industrial agents might cause some economic and environmental challenges. Recently, injection of natural surfactants, as new environmentally friendly EOR agents, for improving oil recovery has been proposed by researchers. In this study, the extract of Vitagnus, a natural surfactant, was used to minimize the interfacial tension (IFT) and alter the rock wettability towards the strong water-wet system, thereby improving the oil recovery from the carbonate rock The conductivity, pH, and turbidity measurements were undertaken to identify the critical micelle concentration (CMC) of the surfactant solutions prepared by mixing 500, 1000, 2000, 3000, 4000, 5000, 6000, and 7000 ppm of the Vitagnus extract and distilled water. The obtained experimental results reveal that the optimum CMC value of the used surfactant was 3000 ppm. At this CMC value, the IFT reduced from 29.5 to 5.28 mN/m, and the contact angle of the oil droplet on the surface of the carbonate rock decreased from 114° to 29°. Accordingly, during the tertiary process, oil recovery was improved from 44% to 54.6% OOIP (original oil in place) by injecting 2.25 PVs of the VIT3000 surfactant containing 3000 ppm of the plant extract.

中文翻译：

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利用界面张力（IFT）降低和润湿性改变机制对罗塔格斯植物提取物增强采油过程的影响的实验研究

表面活性剂驱油是一种化学增强油采收（cEOR）过程，其中将阴离子，阳离子，非离子和两性表面活性剂注入油藏中以生产更多的烃。这些化学和工业因素可能会带来一些经济和环境挑战。最近，研究人员已经提出了注射天然表面活性剂作为新型的环保EOR剂，以提高采油率。在这项研究中，Vitagnus的提取物，一种天然表面活性剂，用于最小化界面张力（IFT）并改变岩石对强水湿系统的润湿性，从而改善了碳酸盐岩石的采油率。进行了电导率，pH和浊度测量，以识别通过混合500、1000、2000、3000、4000、5000、6000和7000 ppm的Vitagnus制备的表面活性剂溶液的临界胶束浓度（CMC）提取物和蒸馏水。获得的实验结果表明，所用表面活性剂的最佳CMC值为3000ppm。在该CMC值下，IFT从29.5降低到5.28 mN / m，并且油滴在碳酸盐岩石表面上的接触角从114°降低到29°。因此，在第三过程中，通过注入2.25 PVs的含3000 ppm植物提取物的VIT3000表面活性剂，油的采收率从OOIP的44％提高至54.6％（原始油）。