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建立了降压法开采水合物藏数学模型,考虑了气-水-水合物-冰相多相渗流、水合物相变及分解动力学过程、冰-水相变、热传导、对流过程、渗透率变化等对于水合物分解的影响。三维水合物藏模拟表明:在开采前期阶段,可采用降压法,但随着储层能量消耗,产气速度下降很快,需转变开采方式。分析了一些主要参数,如孔隙度、渗透率、饱和度、压力等对水合物开采的影响。
The mathematic model of hydrate reservoirs developed by step-down method was established. The gas-water hydrate-ice phase multiphase flow, hydrate phase change and decomposition kinetic process, ice-water phase transition, heat conduction and convection process, permeability The effects of changes on hydrate decomposition. Three-dimensional hydrate reservoir simulation shows that: in the early stages of mining, step-down method can be used, but with the reservoir energy consumption, gas production rate dropped rapidly, the need to change the mining method. Some main parameters such as porosity, permeability, saturation, pressure and so on were analyzed for the influence of hydrate production.