Garzan oil field is located at the south east of Turkey. It is a mature oil field and the reservoir is fractured carbonate reservoir. After producing about 1% original oil in place (OOIP) reservoir pressure started to decline. Waterflooding was started in order to support reservoir pressure and also to enhance oil production in 1960. Waterflooding improved the oil recovery but after years of flooding water breakthrough at the production wells was observed. This increased the water/oil ratio at the production wells. In order to enhance oil recovery again different techniques were investigated. Chemical enhanced oil recovery (EOR) methods are gaining attention all over the world for oil recovery. Surfactant injection is an effective way for interfacial tension (IFT) reduction and wettability reversal. In this study, 31 different types of chemicals were studied to specify the effects on oil production. This paper presents solubility of surfactants in brine, IFT and contact angle measurements, imbibition tests, and lastly core flooding experiments. Most of the chemicals were incompatible with Garzan formation water, which has high divalent ion concentration. In this case, the usage of 2‐propanol as co‐surfactant yielded successful results for stability of the selected chemical solutions. The results of the wettability test indicated that both tested cationic and anionic surfactants altered the wettability of the carbonate rock from oil‐wet to intermediate‐wet. The maximum oil recovery by imbibition test was reached when core was exposed 1‐ethly ionic liquid after imbibition in formation water. Also, after core flooding test, it is concluded that considerable amount of oil can be recovered from Garzan reservoir by waterflooding alone if adverse effects of natural fractures could be eliminated.

中文翻译：

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确定适合的化学物质以提高Garzan油田采收率的实验室研究

加赞油田位于土耳其的东南部。该油田为成熟油田，储层为裂缝性碳酸盐岩储层。产出约1％的原始油（OOIP）后，油藏压力开始下降。为了支持油藏压力并提高石油产量，在1960年开始注水。注水改善了采油率，但经过多年的注水，在生产井上发现了突破性的技术。这增加了生产井处的水/油比。为了提高采油率，再次研究了不同的技术。化学强化采油（EOR）方法在全世界范围内引起越来越多的关注。表面活性剂注射是降低界面张力（IFT）和逆转润湿性的有效方法。在这个研究中，研究了31种不同类型的化学品，以说明其对石油生产的影响。本文介绍了表面活性剂在盐水中的溶解度，IFT和接触角测量，吸水测试以及最后的岩心驱油实验。大多数化学物质与具有高二价离子浓度的Garzan地层水不相容。在这种情况下，使用2-丙醇作为辅助表面活性剂可以成功地确保所选化学溶液的稳定性。润湿性测试的结果表明，所测试的阳离子和阴离子表面活性剂都将碳酸盐岩的润湿性从油湿变为中湿。当岩心在地层水中吸收后暴露于1离子液体中时，通过吸收试验可达到最大采油量。另外，在岩心驱油测试后