中文摘要：

采用数值模拟方法，将降压开采分为完全分解区、分解区和未分解区进行数值模拟研究，建立了天然气水合物多相（气、水、水合物）流分解能量守恒模型、分解反应动力学模型．在此基础上，建立了二维数学模型以分析产气性能影响因素．模拟计算结果表明，出口压力越大，累积产气量越小；边界传热越快，分解越快；绝对渗透率对累积产气量和产气率影响较小．所做工作为进一步开展室内模拟实验和工程应用研究提供了技术依据．

英文摘要：

To simulate the natural gas hydrates, all depressurization zones are divided into three parts： full-decomposed part, decomposing part and be-decomposing part. Beside multi-phase （gas, water and hydrate） flow mass balance and energy balance in all parts, the intrinsic dissociation reaction of hydrate is considered in decomposing part. Based on these models, one two-dimensional program was made for analyzing the factors affecting the production performance. With higher outer pressure, the cumulative gas produced becomes less. As temperature at boundary increases, the decomposition velocity enhances. Absolute permeability makes a minor effect on cumulative gas produced and gas produced rate. The work provides technical support for next experimental simulation and engineering application research.