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高压、低温条件下 ,天然气中含有一定的水分 ,在管道、井筒以及地层多孔介质孔隙中形成水合物 ,水合物的形成会造成巨大的危害。水合物的结构有I、II和H型 ,大多数水合物理论预测模型均在VanderWaals Platteeuw模型的基础上发展起来的。在统计热力学理论基础上 ,推导的水合物相平衡理论模型 ,适用于井筒和地面集输多相管流中水合物生成条件的预测 ,适用于I、II和H型水合物的相平衡计算。实例证明 ,这种模型的计算精度能够满足现场的要求
Under the conditions of high pressure and low temperature, natural gas contains certain amount of water, forming hydrates in the pores of pipes, wells and formation porous media, and the formation of hydrates will cause great harm. Hydrates have structures I, II, and H, and most of the hydrate theory prediction models have been developed based on the VanderWaals Platteeuw model. Based on the statistical thermodynamic theory, the theoretical model of hydrate phase equilibrium can be used to predict the formation conditions of hydrate in wellbore and surface gathering and transporting polyphasic duct flows. It is suitable for the phase equilibrium calculation of hydrates I, II and H. Examples show that the accuracy of this model can meet the requirements of the site