ISSN 1070-4272, Russian Journal of Applied Chemistry, 2014, Vol. 87, No. 8, pp. 1094−1098. © Pleiades Publishing, Ltd., 2014.
Original Russian Text © I.K. Ivanova, M.E. Semenov, I.I. Rozhin, 2014, published in Zhurnal Prikladnoi Khimii, 2014, Vol. 87, No. 8, pp. 1111−1116.
OF SYSTEMS AND PROCESSES
In recent years, challenges of industrial use of natural
gas hydrates attract increasing attention of researchers.
On the one hand, this is due to the prospects of the
development of technologies for natural gas production
and on the other because of the development of
technologies for storage and transport in the hydrated
form as an alternative to pipeline transport [1, 2]. The
successful solution of these technical issues in practice is
associated with the fundamental investigations in the ﬁ eld
of thermodynamics, kinetics, mechanisms of formation,
and also phase transformations of gas hydrates. It should
be noted that among the main areas of physical and
chemical studies of hydrates a study of temperature and
pressure conditions of their formation and decomposition
is one of the most difﬁ cult and unexplored problems.
It was shown [3–11] that a method of differential
scanning calorimetry (DSC) is suitable for high-pressure
studies of thermodynamics and kinetics of the gas
hydrate formation/decomposition. In most of the above-
mentioned studies methane hydrates are used as research
objects, whereas the processes of formation of natural gas
hydrates are still not well understood.
The aim of the study is to determine the temperature
and pressure of phase transitions of the synthesized
natural gas hydrate (NGH) in various model systems
close to the real disperse media.
Studies were performed using a differential scanning
calorimeter of high pressure DSC 204 HP Phoenix
(Netzsch, Germany). A relative error of the enthalpy and
temperature measurement was ±3% and ±3°, respectively.
In experiments steel crucibles with pierced aluminum
caps were used. Natural gas of Srednevilyuiskoe gas and
condensate ﬁ eld (GCF) was used as the hydrate-forming
gas. Gas composition was examined by gas adsorption
chromatography according to State Standard GOST
23781-87  on a gas chromatograph GC-2010 Plus
ATF (Shimadzu, Japan). It was established that methane
prevails in the gas composition (Table 1).
The gas hydrates synthesized in various systems
based on distilled water serve as objects of the study.
Since in extracted industrial systems always different
admixtures occur including mechanical, for taking into
account the likelihood of an additional nucleation sand
was used as admixtures (gavage). In [13–15] an effect of
the accelerating inﬂ uence of surfactants on the kinetics
Synthesis and Phase Transformations of Natural Gas Hydrates
of Srednevilyuiskoe Field
I. K. Ivanova
, M. E. Semenov
, and I. I. Rozhin
Institute of Oil and Gas Problems, Siberian Branch of Russian Academy of Sciences,
ul. Oktyabr’skaya 1, Yakutsk, 677980 Russia
North-Eastern Federal University in Yakutsk, ul. Belinskogo 58, Yakutsk, 677000 Russia
Received August 28, 2014
Abstract—The study discusses the results of investigations of a natural gas hydtrate formation of Srednevilyuiskoe
ﬁ eld in various model systems based on distilled water by DSC. Based on the calculated data conditions for
synthesis of natural gas hydrates in a calorimeter cell were selected and thermobaric conditions of formation and
decomposition of hydrates under study were found. It was shown that in the presence of surfactants the process
of the natural gas hydrate formation led predominantly to the formation of methane hydrates. An inﬂ uence of
mechanical admixtures and surfactants on supercooling was determined, which in turn affects the crystallization
temperatures of systems under study.