In this work, the
dissociation behavior of methane hydrate in quartz
sand sediment by injecting a thermodynamic inhibitor, methanol (MeOH),
was investigated using a one-dimensional experimental apparatus. The
experimental results indicated that the hydrate dissociation process
included four stages: free gas production, methanol dilution, major
hydrate dissociation, and residual gas production. The overall liquid
production rate was smaller than the injection rate during the whole
production process. The cumulative gas produced from hydrate under
methanol solution injection was adjusted with the reference experiment.
A new strategy of the adjustment of the experimental runs was introduced,
which was based on the ratio of the water and methanol solution injection
rates. In general, with the increase of the methanol injection rate
and the methanol concentration, the cumulative hydrate-originating
gas produced increased. During the major hydrate dissociation stage,
the production efficiency was enhanced continuously with the increase
of the injection rate and concentration of the methanol solution,
while the methanol efficiency increased and reached a maximum value
when the concentration was 60 wt % and then gradually decreased.
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