Abstract
The gas production behavior of methane hydrate in porous media using the Thermal Stimulation method with dual vertical well was investigated in the Cubic Hydrate Simulator (CHS), a three-dimensional 5.8-L cubic pressure vessel with the internal length of 0.18 m. Three horizontal layers equally divide the CHS into four regions. 9-spot vertical wells and 25-spot thermometers are arranged on each layer, respectively. The production and injection wells are sited on the cross corners of the CHS. The thermal stimulation process is analyzed. The change characteristics of the injection temperature, pressure, and other related parameters during the injection are obtained. The result also verifies that the hydrate decomposition process is a moving boundary ablation process. The hydrate decomposition boundary moves from the injection well to the production well gradually during the thermal stimulation process. The higher injection rate leads to the lower energy efficiency.
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