天然气水合物分解和开采的机理及数学模型研究综述

回顾了25年来国内外水合物开采数值模拟研究的进展,分析了影响水合物开采过程的主要机理,即传热、气液流动和水合物分解。将已有的模型分为热力开采、降压开采和综合3种模型,并对各种模型所具有的特点进行了讨论。综合分析认为,TOUGH Fx/HYDRATE模型充分考虑了多相多组分并借鉴上述3类开采方式,可模拟开采过程中气液流动和相态变化,具有较高的应用价值。最后探讨了目前模型的主要问题以及发展方向,认为水合物矿藏岩石的绝对渗透率、相对渗透率、热传导系数等关键参数的测量及确定是精确模拟水合物开采过程的重要因素。

Review: Mathematic Modeling of Natural Gas Hydrate Exploitation

To carry out the mathematical modeling works of natural gas hydrate(NGH) exploitation,in predicting the dynamic properties of natural gas hydrate reservoir under different production models,is an important part for the development of commercial technologies for gas production from hydrate reservoir.This article reviews the progress of mathematical modeling works for NGH exploitation since last two decades.The models are classified into three sub groups,i.e.thermal model,depressurization model,and comprehensive model.Main factors that control the gas production process are analyzed,that is heat transfer,gas/water flow and hydrate dissociation.Among these models,TOUGH Fx/HYDRATE which accounts for multiphase and three exploitation methods,and can simulate the phase behavior and the flow of gas and water,has a wide range of application.The main limitation of applying the mathematic model in the NGH exploitation area is lack of reliable parameters of sediment bearing hydrate,such as permeability,thermal conductivity.