On injection of hydrate-forming gas into a gas-saturated snowy
agglomerate while transition through the ice melting point
V.Sh. Shagapov1, 2 and A.S. Chiglintseva1,2,3
1Kazan Federal Research Center, Institute of Mechanics and Mechanical Engineering, Kazan, Russia
2Mavlyutov Institute of Mechanics, Ufa Scientific Center of RAS, Ufa, Russia
3Bashkir State University, Birsk Branch, Birsk, Russia
E-mail: changelina@rambler.ru
Keywords: gas injection, filtration, snowy aggregate, ice melting temperature, self-similar solu-tion, hydrate formation, volumetric zone, Leibenson linearization
Abstract
The paper considers the process of injection of hydrate-forming gas (methane) into a snowy agglomerate (initially saturated with methane). The self-similar problem statement demonstrates that if the warm gas (Te > 0 °C) is injected under a high pressure (pe > p*, where the critical values are found from the initial temperature T0, pressure p0, volumetric snow saturation S, and permeability of snow) into the filtration zone with phase transition,
this produces four characteristic zones: the nearest zone with all snow
transformed into hydrate, therefore, the aggregate filled only with gas and
hydrate, the two intermediate zones where gas, snow or water and hydrate are in
phase equilibrium state, and the distant zone filled only with gas and
snow. The obtained analytical and numerical solutions give an analysis
of the influence of key input parameters like initial state of the aggregate,
gas injection rate, and its temperature, on the structure and the length
of four filtration zones.
DOI: 10.1134/S0869864318010080
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