Research output: Contribution to journal › Article › peer-review
Dynamic in-situ imaging of methane hydrate formation and self-preservation in porous media. / Nikitin, Viktor V.; Dugarov, Geser A.; Duchkov, Anton A. et al.
In: Marine and Petroleum Geology, Vol. 115, 104234, 05.2020.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Dynamic in-situ imaging of methane hydrate formation and self-preservation in porous media
AU - Nikitin, Viktor V.
AU - Dugarov, Geser A.
AU - Duchkov, Anton A.
AU - Fokin, Mikhail I.
AU - Drobchik, Arkady N.
AU - Shevchenko, Pavel D.
AU - De Carlo, Francesco
AU - Mokso, Rajmund
N1 - Publisher Copyright: © 2020 Elsevier Ltd Copyright: Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/5
Y1 - 2020/5
N2 - We present the results of dynamic in-situ 3D X-ray imaging of methane hydrates microstructure during methane hydrate formation and dissociation in sand samples. Short scanning times and high resolution provided by synchrotron X-rays allowed for better understanding of water movement and different types of gas-hydrate formation. Complementing previous observations, we conclude that the process of gas-hydrate formation is accompanied by the water movements caused by cryogenic water suction that happens in sequences of short fast movements with longer equilibrium states in between (when the water is immobile). Based on the 3D microstructure we identified two distinct types of gas-hydrate formation: (i) into the gas pockets and (ii) inside water volumes. For both mechanisms we do not see problems in gas or water supply to support the gas-hydrate formation. The rate of dissociation in the self-preservation mode (pressure drop at negative temperatures) appears to be different for these two types of gas hydrates. This means that the history of the gas-hydrate formation may influence its behaviour at the dissociation stage (e.g. gas-hydrate production).
AB - We present the results of dynamic in-situ 3D X-ray imaging of methane hydrates microstructure during methane hydrate formation and dissociation in sand samples. Short scanning times and high resolution provided by synchrotron X-rays allowed for better understanding of water movement and different types of gas-hydrate formation. Complementing previous observations, we conclude that the process of gas-hydrate formation is accompanied by the water movements caused by cryogenic water suction that happens in sequences of short fast movements with longer equilibrium states in between (when the water is immobile). Based on the 3D microstructure we identified two distinct types of gas-hydrate formation: (i) into the gas pockets and (ii) inside water volumes. For both mechanisms we do not see problems in gas or water supply to support the gas-hydrate formation. The rate of dissociation in the self-preservation mode (pressure drop at negative temperatures) appears to be different for these two types of gas hydrates. This means that the history of the gas-hydrate formation may influence its behaviour at the dissociation stage (e.g. gas-hydrate production).
KW - Dissociation
KW - Formation
KW - Methane gas hydrates
KW - Phase-contrast tomography
KW - X-ray synchrotron tomography
KW - VISUALIZATION
KW - MICROTOMOGRAPHY
KW - DECOMPOSITION
KW - PRESSURE
KW - EVOLUTION
KW - TEMPERATURE
KW - RADON-TRANSFORM
KW - PORE HABIT
KW - GAS
KW - PURE
UR - http://www.scopus.com/inward/record.url?scp=85078700903&partnerID=8YFLogxK
U2 - 10.1016/j.marpetgeo.2020.104234
DO - 10.1016/j.marpetgeo.2020.104234
M3 - Article
AN - SCOPUS:85078700903
VL - 115
JO - Marine and Petroleum Geology
JF - Marine and Petroleum Geology
SN - 0264-8172
M1 - 104234
ER -
ID: 23328473