中国工程科学2011，Vol.13Issue(5)：103-112,10.
海洋天然气水合物藏开采若干问题研究
Study on several problems of oceanic gas hydrate reservoir exploitation
摘要
Abstract
Several fundament problems like the mathematical model and numerical simulation of gas production from natural gas hydrate reservoir, similarity principle of gas hydrate physical simulation and exploitation method of gas hydrate reservoir are researched. A mathematical model is developed to simulate the hydrate dissociation in hydrate - bearing porous medium. The model can be used to analyze the effects of the flow of multiphase fluids, the intrinsic kinetic process of hydrate dissociation, the endothermic process of hydrate dissociation, ice - water phase equilibrium, the variation of permeability, the convection and conduction on the hydrate dissociation and gas and water production. For a single gas hydrate reservoir exploited only by depressurization, the study shows that water freezing appears in the formation with the dissociation of gas hydrate under certain condition due to energy deficiency for hydrate dissociation, which can lead to blockage of flow path and stopping of gas production. For a hydrate reservoir underlain by a free gas zone exploited by depressurization, the results show that the overlying hydrate zone can supply an amount of gas to improve the output of production well and evidently prolong the lifespan of gas reservoir. The combination method of warn water flooding with depressurizafion is proposed, which can comprehensively utilize the advantage of thermal stimulation and depressurization. The method is characterized by a long stable gas production period with a high gas rate.关键词
天然气水合物/降压法/注温水-降压联合开采方法/数学模型/相似准则Key words
natural gas hydrate/ depressurization/ combination method of warm water flooding with depressurization/ mathematical model/ similarity principle分类
海洋科学引用本文复制引用
白玉湖,李清平..海洋天然气水合物藏开采若干问题研究[J].中国工程科学,2011,13(5):103-112,10.基金项目
国家863计划"天然气水合物模拟开采技术研究"(2006AA09A209)和国家973项目"天然气水合物开采中的多相流动机理和相关基础理论研究"(2009CB219507) （2006AA09A209）
