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首页> 外文期刊>International Journal of Geophysics >A Synergy between Controlled Salinity Brine and Biosurfactant Flooding for Improved Oil Recovery: An Experimental Investigation Based on Zeta Potential and Interfacial Tension Measurements
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A Synergy between Controlled Salinity Brine and Biosurfactant Flooding for Improved Oil Recovery: An Experimental Investigation Based on Zeta Potential and Interfacial Tension Measurements

机译：控制盐度盐水和生物活性剂洪水之间的协同作用，用于改善溢油：基于Zeta电位和界面张力测量的实验研究

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In this study, we have investigated the effects of brine and biosurfactant compositions on crude-oil-rock-brine interactions, interfacial tension, zeta potential, and oil recovery. The results of this study show that reduced brine salinity does not cause significant change in IFT. However, addition of biosurfactants to both high and low salinity brines resulted in IFT reduction. Also, experimental results suggest that the zeta potential of high salinity formation brine-rock interface is positive, but oil-brine interface was found to be negatively charged for all solutions used in the study. When controlled salinity brine (CSB) with low salinity and CSB with biosurfactants were injected, both the oil-brine and rock-brine interfaces become negatively charged resulting in increased water-wetness and, hence, improved oil recovery. Addition of biosurfactants to CSB further increased electric double layer expansion which invariably resulted in increased electrostatic repulsion between rock-brine and oil-brine interfaces, but the corresponding incremental oil recovery was small compared with injection of low salinity brine alone. Moreover, we found that the effective zeta potential of crude oil-brine-rock systems is correlated with IFT. The results of this study are relevant to enhanced oil recovery in which controlled salinity waterflooding can be combined with injection of biosurfactants to improve oil recovery.
机译：在这项研究中，我们研究了盐水和生物活性剂组合物对原油 - 油岩 - 盐水相互作用，界面张力，Zeta电位和溢油的影响。该研究的结果表明，降低的盐水盐度不会导致IFT的显着变化。然而，向高盐度和低盐度盐水中添加生物表面活性剂导致IFT减少。此外，实验结果表明，高盐度形成盐水岩界面的Zeta电位是阳性的，但发现油盐水界面对该研究中使用的所有溶液带来负电荷。当注入低盐度和CSB的受控盐度盐水（CSB）被注入时，油盐和岩石 - 盐水界面都被带负电，导致水 - 湿润增加，因此改善了采油。向CSB加入生物表面活性剂进一步增加的电双层膨胀，其总是导致岩石盐水和油盐界面之间的静电排斥力增加，但与单独的低盐度盐水注射了相应的增量油回收。此外，我们发现原油 - 盐水岩系统的有效Zeta电位与IFT相关。该研究的结果与增强的采油，其中控制盐度水料可以与生物表面活性剂注射相结合以改善溢油。

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