ISSN 0021-8944, Journal of Applied Mechanics and Technical Physics, 2018, Vol. 59, No. 1, pp. 1–8.
Pleiades Publishing, Ltd., 2018.
Original Russian Text
I.K. Gimaltdinov, M.V. Stolpovskii, M.K. Khasanov.
RECOVERY OF METHANE FROM GAS HYDRATES
IN A POROUS MEDIUM BY INJECTION OF CARBON DIOXIDE
I. K. Gimaltdinov
, and M. K. Khasanov
Abstract: This paper presents a mathematical model for methane hydrate–carbon dioxide replace-
ment by injection of carbon dioxide gas into a porous medium rich in methane and its gas hydrate.
Numerical solutions describing the pressure and temperature variation in a reservoir of ﬁnite length
are obtained. It is shown that the replacement process is accompanied by a decrease in pressure and
an increase in temperature of the porous medium. It is established that during the time of com-
plete replacement of methane from a reservoir decreases with increasing permeability of the porous
medium and the pressure of the injected gas.
Keywords: porous medium, gas hydrate, ﬁltration.
One of the most promising sources of hydrocarbons are considered to be natural gas hydrate deposits.
However, until now there are no safe technologies of development of these ﬁelds. Currently, the main method for the
production of natural gas from hydrates are depressurization, heating, and the addition of inhibitors. These processes
are used to decompose hydrates into gas and water to extract natural gas. However, these methods of development
of gas hydrate deposits require high energy costs. Therefore, a new method for the recovery of natural gas from
hydrate by replacement of methane with carbon dioxide in gas hydrates has been proposed [1–4]. Experimental
studies have shown that this reaction can occur at temperature and pressure conditions corresponding to the stable
existence of methane hydrate and is therefore not accompanied by decomposition of methane hydrate into gas and
water [5–8]. Studies [5–8] were conducted for samples of small size, so that the replacement process was limited
by the rate of gas diﬀusion through hydrate cake. In the case of real extended natural reservoirs, the replacement
process is limited not so much by the rate of the process, as by heat and mass transfer in the porous medium.
Mathematical models of the formation and decomposition of gas hydrates in porous media under gas injection
were formulated, in particular, in [9–15]. However, the gas injected into these media is the same as the initial reservoir
gas. A mathematical model for the injection of carbon dioxide into a reservoir containing methane and water in a
free state is presented in [16, 17] for the case where methane gas hydrate is absent and, therefore, replacement in
gas hydrate does not occur.
This paper presents a mathematical model for the replacement of methane from gas hydrate with carbon
dioxide injected into a methane hydrate reservoir of ﬁnite length.
Ufa State Oil Technical University, Ufa, 450062 Russia; iljas firstname.lastname@example.org; s email@example.com.
Sterlitamak Branch of Bashkir State University, Sterlitamak, 453103 Russia; firstname.lastname@example.org. Translated
from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 59, No. 1, pp. 3–12, January–February, 2018. Original
article submitted September 28, 2016; revision submitted February 8, 2017.
2018 by Pleiades Publishing, Ltd.