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Oil/water/rock wettability: Influencing factors and implications for low salinity water flooding in carbonate reservoirs

机译：油/水/岩的润湿性：碳酸盐岩储层低盐度水驱的影响因素及启示

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Wettability of the oil/brine/rock system is an essential petro-physical parameter which governs subsurface multiphase flow behaviour and the distribution of fluids, thus directly affecting oil recovery. Recent studies [1-3] show that manipulation of injected brine composition can enhance oil recovery by shifting wettability from oil-wet to water-wet. However, what factor(s) control system wettability has not been completely elucidated due to incomplete understanding of the geochemical system. To isolate and identify the key factors at play we used SO42-free solutions to examine the effect of salinity (formation brine/FB, 10 times diluted formation brine/10 dFB, and 100 times diluted formation brine/100 dFB) on the contact angle of oil droplets at the surface of calcite. We then compared contact angle results with predictions of surface complexation by low salinity water using PHREEQC software.
机译：石油/盐水/岩石系统的润湿性是必不可少的石油物理参数，它决定着地下多相流体的流动特性和流体的分布，从而直接影响着石油的采收率。最近的研究[1-3]表明，通过将润湿性从油润湿转变为水润湿，操纵注入的盐水成分可以提高油的采收率。然而，由于对地球化学系统的不完全了解，尚未完全阐明控制系统润湿性的因素。为了分离并确定关键因素，我们使用了不含SO42的溶液来检查盐度（地层盐水/ FB，10倍稀地层盐水/ 10 dFB和100倍稀地层盐水/ 100dFB）对接触角的影响方解石表面的油滴。然后，我们使用PHREEQC软件将接触角结果与低盐度水对表面络合的预测进行了比较。

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