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A geothermal-assisted CO2 replacement method (GACR) was proposed, in which ambient-temperature CO2 is injected from the well head of a heat exchange well to the wellbore in geothermal reservoir for heating, and the heated CO2 then flows upward into the hydrate bearing layer (HBL) to accelerate the natural gas hydrate (NGH) dissociation. The GACR method, which is low-carbon and environment-friendly,...
We studied the formation micro-mechanism of the small and large cages in the nucleation pathway of sI methane hydrate using ab initio calculations. We found that the cage precursor is a pentagonal ring of water molecules plus one methane molecule, which is formed through the attraction of the pentagonal water ring to the methane molecule. Due to the difference of the hydrophobic-hydrophilic effects,...
This paper numerically investigated the production characteristics of a gas hydrate reservoir by cyclic hot water stimulation with a separated-zone horizontal well, which combines depressurization and thermal stimulation to improve the development effect. A class II conception model of a heterogeneous gas hydrate reservoir was established based on the reservoir parameters of the China Shenhu area...
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