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天然气水合物的特征是优质、洁净、储量巨大,主要蕴藏在陆域的永久冻土或海洋沉积物中,被认为是人类在21世纪最重要的替代能源,对水合物开采的基础研究受到世界各国政府的高度重视。数值模拟技术作为一种重要的预测和评估手段,近年来被应用于水合物开采的研究中。TOUGH+HYDRATE模型是国际上较为先进的水合物数值模型,基于该模型对水合物竖井降压开采进行数值模拟,研究海底沉积物中的水合物藏在开采中的气体运移、产量规律等是天然气水合物开发领域的热点和前沿问题。本文利用TOUGH+HYDRATE,以南海神狐海域为研究对象,建立水合物竖井降压开采模型,研究气水产量的演化规律。在降压分解过程中设置3种不同的井筒压力(11.5 MPa、12.46 MPa和13 MPa),模拟结果显示,井筒压力为12.46 MPa时,储层内的累计产气总量大,效益显著,水合物分解产气速率也较为适中,开发潜力优于其他两种情况。
Gas hydrates are characterized by their high quality, cleanliness and huge reserves, mainly in the continental permafrost or marine sediments. They are considered as the most important alternative energy source for mankind in the 21st century. The basic research on hydrate production has been well received by the world Governments attach great importance. As an important prediction and evaluation method, numerical simulation technology has been applied to the research of hydrate production in recent years. TOUGH + HYDRATE model is the most advanced hydrate numerical model in the world. Based on this model, numerical simulation of hydrate shaft depressurization mining is carried out to study the gas migration of hydrate reservoir in the seabed sediment during mining. The yield law is Hot spots and frontier issues in the field of gas hydrate development. In this paper, TOUGH + HYDRATE, the South China Sea Shen Fox waters as the research object, the establishment of hydrate shaft buck mining model to study the evolution of gas and water production patterns. Three different wellbore pressures (11.5 MPa, 12.46 MPa and 13 MPa) were set up in the process of depressurization decomposition. The simulation results show that when the wellbore pressure is 12.46 MPa, the total amount of accumulated gas in the reservoir is large and the benefits are obvious. Gas decomposition rate of gas production is also more modest, development potential is better than the other two cases.