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油气工业普遍采用在工业生产设备及输送管道中注入甲醇或乙二醇等热力学抑制剂的方法来改变水合物的热力学稳定条件，以达到抑制或避免水合物生成的目的。因而，预测在此条件下的水合物生成条件就十分必要了。目前预测水合物生成条件的热力学模型几乎都是以经典统计热力学为基础的。文中较为详尽地综述了水合物相平衡条件的实验测定以及预测含盐、含醇和含可溶性聚合物水溶液体系中相平衡条件的理论模型。提出了今后水合物相平衡研究的主要方向。

PROGRESS IN THE RESEARCH ON THE PHASE EQUILIBRIUM OF NATURAL GAS HYDRATES

Generally,the method of injecting some thermodynamic inhibitors as methanol or ethylene glycol,etc.,into the production equipments and transferring pipelines to change the thermodynamic stable conditions so as to achieve the goal of restraining or avoiding hydrate formation in petroleum industry.Therefore it is quite necessary to predict the hydrate formation conditions under the case mentioned above.At present,the thermodynamic models of predicting the hydrate formation conditions are almost on the basis of classical statistical thermodynamics.The experimental determination of the phase equilibrium conditions of hydrates and the theoritical model of predicting the phase equilibrium conditions in an aqueous solution containing salts,alcohols and soluble polymers are comprehensively stated in detail and the major trend of studying the phase equilibrium of hydrates in the future is also proposed in this paper.