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天然气水合物因其储量巨大、分布广、清洁而被认为是一种未来的重要能源.为了对海洋条件下水合物藏的开采方式进行研究,建立了降压法开采水合物藏的数学模型,模型中系统地考虑了气-水-水合物-冰相多相渗流过程、水合物分解动力学过程、水合物相变过程、冰-水相变过程、热传导、对流过程、渗透率变化等对于水合物分解以及产气和产水的影响.对一、二维条件下降压法开采水合物进行了数值模拟,与实验具有较好的一致性.对水合物藏进行了三维数值模拟,结果表明:在开采的前期阶段,可以采用降压法进行开采,但随着储层能量的消耗,冰相饱和度的不断增加,降压法开采产气速度下降很快,需要转变开采方式,如注热法,注化学剂法等.
Because of its huge reserves, wide distribution and cleanness, natural gas hydrate is considered as an important energy source in the future.In order to study the exploitation mode of hydrate reservoir under oceanic conditions, a mathematical model of hydrate reservoir decompression is established, In the model, the gas-water-hydrate-ice phase multiphase flow, hydrate decomposition kinetics, hydrate phase transition, ice-water phase transition, heat conduction, convection and permeability are systematically considered Hydrate decomposition and the effects of gas production and water production.The numerical simulation of hydrate production under one and two-dimensional conditions by pressure-lowering method is in good agreement with the experiment.The three-dimensional numerical simulation of hydrate reservoir is carried out and the results The results show that in the early stage of mining, the buck method can be used for mining. However, with the depletion of reservoir energy and the increasing saturation of the ice phase, the gas production rate of the buck method decreases rapidly and the mining mode needs to be changed. Heat injection method, chemical injection method.