【摘要】 考虑盐浓度的分布,根据质量守恒、能量守恒、天然气水合物的分解动力学等方程建立天然气水合物储层降压开采的数学模型,该模型可描述三相八组分水合物储层开采的多相非等温渗流过程。利用该模型对一维条件下纯水和含盐富水相体系水合物的开采动态进行模拟计算。结果表明:模拟结果与试验结果具有较好的一致性;在盐水体系的水合物藏中,盐影响了水合物的相平衡,加快了水合物的分解,压力传播比纯水体系的快得多,并使得试验和模拟的瞬时产气量波动很大。更多还原

【Abstract】 Considering the distribution of salt concentration,a mathematical model of production of natural gas hydrate reservoir by depressurization in salt-water system was established according to equations of conservation of mass and energy,kinetics equations of natural gas hydrate decomposition.The process of non isothermal flow in hydrate reservoir with three phases and eight components can be described by this model.The production behaviors of hydrates in pure-water and salt-water system were simulated under one dimension.The results show that the simulated results agree well with experimental results.In salt-water system,the salt affects phases balance of hydrates and accelerates the hydrates decomposition,and the pressure spreads much more quickly than that in pure-water system,which results in a big fluctuation of instantaneous gas production rate both in experiment and simulation.更多还原