Wettability Indicator Parameter Based on the Thermodynamic Modeling of Chalk-Oil-Brine Systems,Energy & Fuels

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Wettability Indicator Parameter Based on the Thermodynamic Modeling of Chalk-Oil-Brine Systems
Energy & Fuels ( IF 5.2 ) Pub Date : 2020-06-10 , DOI: 10.1021/acs.energyfuels.0c00716
María Bonto ₁ , Ali A. Eftekhari ₁ , Hamidreza M. Nick ₁

Affiliation

The complex physicochemical interactions in the calcite-brine-crude oil system, triggered by the injection of modified salinity water (MSW) into the reservoir, are modeled by several researchers. However, the proposed models are either not consistent with a wettability alteration mechanism or cannot explain the observed improved oil recovery in chalk. We propose a new methodology denominated “Available Adsorption Sites” (AAS) that assesses the wettability alteration as a combined effect of a chemical and electrostatic contribution. Thus, we describe mathematically the interactions between the polar groups in the oil phase and the chalk by considering analogy with the thermodynamics of adsorption of an ion on a charged surface. The chalk wetting properties depend on the number of sites available for the adsorption of oleic polar groups at the mineral surface and the electrical potential at the rock-brine and brine-oil interfaces. We evaluate how the AAS parameter correlates with the remaining oil saturation from spontaneous imbibition tests on chalk samples. This approach is not only useful for the predictive evaluation of the outcome of MSW in chalk reservoirs but can also be integrated in reactive transport models and assess the flow of organic contaminants (e.g., naphtenic acids) in chalk aquifers. The model can potentially be applied to other carbonates.

中文翻译：

基于粉笔-油-盐水系统热力学模型的润湿性指标参数

由几位研究人员模拟了方解石-盐水-原油系统中复杂的物理化学相互作用，该过程是由向储层中注入改良盐度水（MSW）引发的。然而，提出的模型或者与润湿性改变机制不一致，或者不能解释观察到的白垩油采收率提高。我们提出了一种称为“可用吸附位点”（AAS）的新方法，该方法将润湿性变化评估为化学和静电作用的综合作用。因此，我们通过考虑与离子在带电表面上的吸附的热力学的类比来数学描述油相和白垩中极性基团之间的相互作用。粉笔的润湿性能取决于矿物表面油酸极性基团的吸附位点数量以及岩盐水和盐水-油界面的电势。我们通过对白垩样品进行自发吸水测试来评估AAS参数与剩余油饱和度之间的关系。这种方法不仅可用于对粉笔储层中城市固体废弃物的结果进行预测评估，而且可集成到反应性运输模型中，并评估粉笔含水层中有机污染物（例如，萘酸）的流量。该模型可以潜在地应用于其他碳酸盐。这种方法不仅可用于对粉笔储层中城市固体废弃物的结果进行预测评估，而且可集成到反应性运输模型中，并评估粉笔含水层中有机污染物（例如，萘酸）的流量。该模型可以潜在地应用于其他碳酸盐。这种方法不仅可用于对粉笔储层中城市固体废弃物的结果进行预测评估，而且可集成到反应性运输模型中，并评估粉笔含水层中有机污染物（例如，萘酸）的流量。该模型可以潜在地应用于其他碳酸盐。

更新日期：2020-07-16

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