Abstract This work is concerned with the calculation of binary interaction coefficients necessary for the accurate evaluation of hydrate inhibitor requirements using the Soave-Redlich-Kwong (SRK) cubic equation of state (EoS) coupled with the Huron-Vidal (HV) mixing rule. Binary interaction coefficients (BIC) of the model were determined, as a function of temperature, to predict fluid saturation pressures and composition distributions (of methanol and monoethylene glycol) at several conditions of interest. An important finding of this work is the generalization of the binary interaction coefficients as a function of the acentric factor of the hydrocarbon components. The essence of this procedure was to facilitate the evaluation of binary interaction coefficients of heavier, ill-defined fractions of a reservoir fluid. A validation of the interaction coefficients was also carried out by the comparison of the model with experimental vapour-liquid equilibrium (VLE) data. The SRK-EoS with the Huron-Vidal mixing rule and the generated BIC were found to reasonably represent the VLE of the systems tested. The results of this work could facilitate accurate estimations of inhibitor concentrations and flow rates in practical/real field operations.

中文翻译：

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使用 SRK 状态方程和 Huron-Vidal 混合规则的二元相互作用系数对水合物抑制的相关性

摘要 这项工作涉及使用 Soave-Redlich-Kwong (SRK) 三次状态方程 (EoS) 和 Huron-Vidal (HV) 混合规则计算准确评估水合物抑制剂要求所需的二元相互作用系数。模型的二元相互作用系数 (BIC) 被确定为温度的函数，以预测在几个感兴趣的条件下的流体饱和压力和组成分布（甲醇和单乙二醇）。这项工作的一个重要发现是将二元相互作用系数概括为烃组分的偏心因子的函数。该程序的本质是促进对储层流体中较重的、定义不明确的部分的二元相互作用系数的评估。通过将模型与实验汽液平衡 (VLE) 数据进行比较，还对相互作用系数进行了验证。发现具有 Huron-Vidal 混合规则的 SRK-EoS 和生成的 BIC 可以合理地代表所测试系统的 VLE。这项工作的结果有助于在实际/实际现场操作中准确估计抑制剂浓度和流速。