Abstract: | We consider the specifics of decomposition of gas hydrates under thermal and depressive action on a porous medium completely
filled with a solid hydrate in the initial condition. The existence of volumetric-expansion zones, in which the hydrate coexists
in equilibrium with water and gas, is shown to be possible in high-permeable porous media. The self-similar problems of hydrate
decomposition upon depression and heating are studied. Ii is shown that there are solutions according to which hydrate decomposition
can occur both on the surface of phase transitions and in the volumetric region. We note that, in the first case, decomposition
is possible without heat supply to a medium and even with heat removal.
Institute of Mechanics of Multiphase Systems, Siberian Division, Russian Academy of Sciences, Tyumen' 625000. Translated from
Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 39, No. 3, pp. 111–118, May–June, 1998. |