含蜡凝析物中蜡分子扩散、聚集与沉积行为的影响机制

Influential mechanism of diffusion, aggregation and deposition behavior of wax molecules in waxy condensates

摘要

基于凝析物基础物性分析,构建涵盖甲烷、甲烷-乙烷和甲烷-乙烷-丙烷不同凝析气流体环境的含蜡凝析物蜡分子动力学模拟体系,考虑相变温度与压力工况,研究凝析气相存在下蜡分子的动力学行为。结果表明:凝析气体在体系中的溶解度是影响蜡分子扩散行为的主导因素,且温度、压力的协同作用能促进蜡分子的扩散,蜡分子在不同体系中的扩散能力依次为甲烷-乙烷-丙烷体系>甲烷-乙烷体系>甲烷体系;不同于温度升高使蜡分子间的结合能降低、热运动加剧,进而持续削弱蜡分子的聚集和沉积行为,压力的升高既会压缩蜡分子的间距而促进蜡分子发生聚集,又能够通过增加体系中气体的溶解度使其对蜡分子的聚集产生阻碍;高压能够使沉积在壁面上的蜡分子层变得致密,但也会使溶解进油相中的气体分子数增加,导致蜡分子向壁面处的运动受阻,在一定程度上削弱沉积行为。

Abstract

Based on the analysis of the basic physical properties of condensates, different molecular dynamics simulation systems of waxy condensates covering different condensate gas fluid environments of methane, methane-ethane and methane-ethane-propane were constructed. The dynamic behavior of wax molecules in the presence of condensate gas was studied considering the phase transition temperature and pressure conditions. The results indicate that the solubility of condensate gas in the system is the dominant factor affecting the diffusion behavior of wax molecules, and the synergistic effect of temperature and pressure exhibits can promote the wax molecules diffusion. The diffusion ability of wax molecules in different systems is methane-ethane-propane system>methane-ethane system>methane system. Different from the increase of temperature, the binding energy between wax molecules decreases and the thermal motion intensifies, which further weakens the aggregation and deposition behavior of wax molecules. The increase of pressure not only compresses the spacing of wax molecules and promotes the aggregation of wax molecules, but also hinders the aggregation of wax molecules by increasing the solubility of gas in the system. High pressure can make the wax molecular layer deposited on the wall become dense, but it also increases the number of gas molecules dissolved in the oil phase, which will hinder the movement of wax molecules to the wall and weaken the deposition behavior to a certain extent.

关键词

含蜡凝析物 / 相变析蜡 / 蜡分子行为 / 聚集沉积 / 分子动力学模拟

Key words

waxy condensates / phase transformation and wax precipitation / wax molecular behavior / aggregation and deposition / molecular dynamics simulation

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基金资助

国家自然科学基金项目(52074090)