中文摘要：

针对油气输运管线中天然气水合物堵塞问题,重点研究了油包水乳化液滴形成气体水合物的动力学特性。根据原油的甲烷溶解能力经验模型,预测了油包水乳化液（35%（V）水和65%（V）白油）中油-液两相区的甲烷饱和溶解度,优化了乳化液滴的水合反应动力学模型,并且对单个乳化液滴在不同压力和不同液滴尺寸条件的水合物结晶过程进行了数值模拟。研究结果表明,水合物在白油-水乳化体系的结晶生长过程是一个缩核过程,甲烷消耗量和反应速率随着液滴半径的增大而增大,但是水合物转化率随着液滴半径的增大而减小;压力越高,水合物转化时间越短,该结果对揭示油包水乳化液滴的水合结晶机理以及油气输运管线水合物抑制技术的发展具有重要意义。

英文摘要：

The kinetics of methane hydrate formation in water-in-oil emulsions was investigated to solve problems of hydrate plug in oil and gas transport pipelines. Methane saturation solubility in water-in-oil dispersions （35%（V） water and 65%（V） white oil） was predicted based on an industrial empirical model for the calculation of methane solubility in crude oil, and the kinetic model for hydrate formation in water droplets suspended in water-in-oil emulsions was optimized. Numerical simulations of hydrate crystallization in a single water droplet were performed under different pressures and droplet size conditions. The results indicate that hydrate formation in water-in-oil emulsions is a core-shrinking process, and methane consumption and hydrate formation rates in a single droplet increase with the increase of droplet size, but the rate of water conversion to hydrate decreases. The results obtained are valuable for the understanding of hydrate crystallization mechanism in water-in-oil emulsions and also for the prevention of hydrate plug in petroleum pipelines.