Heat and mass transfer analysis of depressurization-induced hydrate decomposi...

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【文件名】Heat and mass transfer analysis of depressurization-induced hydratedecomposition with different temperatures of over- and underburden
【文件格式】 PDF
【页数】 12
【内容介绍】Natural Gas Hydrate (NGH) reserves are large and regarded as an important alternative future energysource. Safely and efficiently exploiting natural gas hydrates has recently become a hot issue around theworld. The decomposition of natural gas hydrate requires a great deal of absorbed heat. The decompositionprocess is a complicated heat and mass transfer process with phase changes, such that heat andmass transfer will have a great impact on the decomposition results. Focusing on the heat transfer effect,a two dimensional mathematical model of natural gas hydrate decomposition was established. Using anumerical simulation method, the thermal conductivities of different porous mediums were selected andthe bottom hole pressure (BHP) was changed under different overburden and underburden temperaturesto simulate the depressurization exploitation of natural gas hydrates. The reservoir temperature distribution,hydrate decomposition front, gas production rate, and cumulative gas production under differentcases were obtained. The results show that the incoming heat directly influenced the reservoir temperaturedistribution, hydrate decomposition rate, and gas production and the temperature at any pointon the decomposition front is constant under certain BHP. When there was no external heat introducedinto the hydrate-bearing layers, the impact of thermal conductivity on decomposition was greater, butdecreased with increasing temperature of overburden and underburden. When no external heat wasintroduced into the hydrate-bearing layers, the BHP became the main controlling factor of the cumulativegas production, and the effect of the BHP on the cumulative gas production was graduallyweakened with increasing temperatures of the overburden and underburden.
Keywords:Natural gas hydrate; DepressurizationHeat and mass transfer ;Thermal conductivity ;BHP; Gas production

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