Abstract
In this study, a 2D hydrate dissociation simulator has been improved and verified to be valid in numerical simulations of the gas production behavior using depressurization combined with a well-wall heating method. A series of numerical simulations were performed and the results showed that well-wall heating had an influence enhancing the depressurization-induced gas production, but the influence was limited, and it was even gradually weakened with the increase of well-wall heating temperature. Meanwhile, the results of the sensitivity analysis demonstrated the gas production depended on the initial hydrate saturation, initial pressure and the thermal boundary conditions. The supply of heat for hydrate dissociation mainly originates from the thermal boundaries,whichcontrolthehydratedissociationandgasproductionbydepressurizationcombined with well-wall heating. However, the effect of initial temperature on the gas production could be nearly negligible under depressurization conditions combined with well-wall heating.
Highlights
In worldwide marine deposits and permafrost areas, a large amount of potentially producible natural gas is enclosed in ice-like solid hydrate reservoirs [1]
Based on the comparison between the numerical results of the cumulative gas production, the temperature and pressure with the experimental data, Figures 2–4 indicate that the model is feasible to simulate the dissociation of methane hydrate under depressurization combining with well-wall heating
Based on the comparison between the numerical results of the cumulative gas production, the temperature and pressure with the experimental data, Figure 2 indicate that the model is feasible to simulate the dissociation of methane hydrate under depressurization combining 8with
Summary
In worldwide marine deposits and permafrost areas, a large amount of potentially producible natural gas is enclosed in ice-like solid hydrate reservoirs [1]. Several efficient and feasible gas recovery methods for in-situ CH4 recovery from the hydrate reservoirs have been proposed, such as hot water injection [4,5], in situ combustion [6,7], depressurization [8,9,10,11], inhibitor injection [12,13], CO2 replacement [14,15] and the combined methods [16,17,18,19,20] Using these technologies, extensive research on natural gas production from hydrate in field trials has been conducted within the last decade [21,22,23,24,25]. The first offshore production test has been carried out in the Nankai Trough, Japan, the technical feasibility of the depressurization technique is confirmed [24] and this method appears to be the most promising and economic one [3,26]
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