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首页> 外文期刊>ACS Omega >Oil Recovery Efficiency and Mechanism of Low Salinity-Enhanced Oil Recovery for Light Crude Oil with a Low Acid Number
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Oil Recovery Efficiency and Mechanism of Low Salinity-Enhanced Oil Recovery for Light Crude Oil with a Low Acid Number

机译：低酸值轻质原油的采油效率和低盐度提高采油机理

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Low salinity waterflooding (low salinity-EOR) has attracted great interest from many giant oil producers and is currently under trial in some of the oil fields of the United States, Middle Eastern countries, and North Sea reservoirs. Most of the reported studies on this process were carried out for medium to relatively heavy oil with significant polar contents. In this work, we have investigated low salinity waterflooding performance for light paraffinic crude oil with a low acid number. This study has been performed using crude oil from an Indian offshore oilfield and Indian offshore seawater. Oil recovery efficiencies of seawater and its diluted versions (low salinity seawater) were evaluated through core-flooding experiments performed on a silica sand pack containing small amounts (2 wt %) of bentonite clay saturated with crude oil. Interfacial tension and wettability studies were performed to understand the associated low salinity effects on the crude oil/brine/rock properties. Effluent brine produced during the flooding experiments was also analyzed to obtain a clearer insight into the low salinity-enhanced oil recovery (EOR) mechanism. The results showed that injection of low salinity seawater can significantly increase the waterflood recovery in comparison with high salinity seawater injection. Interfacial tension and contact angle studies revealed that there is an optimum dilution level at which the interfacial tension and wettability are the most favorable for enhanced oil recovery even in the case of light paraffinic crude. These results are in line with the results obtained from the core-flooding experiments. The possible reason behind recovery improvement based on the interfacial tension and wettability studies in conjugation with the effluent brine analysis has been discussed in detail. In this study, we have observed that the enhanced oil recovery efficiency could be achieved by applying low salinity seawater flooding even in the case of light paraffinic oil with a low acid number.
机译：低盐度水驱（低盐度EOR）引起了许多大型石油生产商的浓厚兴趣，目前正在美国，中东国家和北海油藏的某些油田进行试验。关于该过程的大多数已报道的研究都是针对具有明显极性含量的中度至相对重油进行的。在这项工作中，我们研究了酸度低的轻质石蜡原油的低盐度注水性能。这项研究是使用印度海上油田的原油和印度海上海水进行的。通过在含少量（2重量％）膨润土的原油饱和的硅砂包上进行岩心驱油实验，评估了海水及其稀释版本（低盐度海水）的采油效率。进行界面张力和润湿性研究以了解对原油/盐水/岩石特性的相关低盐度影响。还分析了驱油实验过程中产生的废水盐水，以更清楚地了解低盐度提高采油率（EOR）的机理。结果表明，与高盐度海水注入相比，注入低盐度海水可以显着提高水驱采收率。界面张力和接触角研究表明，即使在轻链烷烃原油的情况下，在最佳稀释水平下，界面张力和润湿性对提高采油率也是最有利的。这些结果与从岩心驱替实验获得的结果一致。详细讨论了基于界面张力和润湿性研究与废水盐水分析相结合的提高采收率的可能原因。在这项研究中，我们发现即使在酸值较低的轻质石蜡油情况下，通过应用低盐度海水驱油也可以提高采油效率。

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