Dissociation mechanism of methane hydrate by CaCl 2 : an experimental and molecular dynamics study
The formation of gas hydrate is a serious threat to the safe and effective completion of deepwater drilling and transportation operations, although it is considered as a potential energy resource. The inorganic salts are generally used as thermodynamic inhibitors; CaCl as a common additive in drilli...
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Published in | Journal of molecular modeling Vol. 28; no. 4; p. 109 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Germany
31.03.2022
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Subjects | |
Online Access | Get full text |
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Summary: | The formation of gas hydrate is a serious threat to the safe and effective completion of deepwater drilling and transportation operations, although it is considered as a potential energy resource. The inorganic salts are generally used as thermodynamic inhibitors; CaCl
as a common additive in drilling fluids exhibits unique properties. In this study, we explored the dissociation mechanism of CH
hydrate in CaCl
solutions at the macroscopic and microscopic scale using experiment and molecular dynamics (MD) simulation. The experimental results showed that CaCl
accelerated the dissociation rate of CH
hydrate. The dissociation rate of CH
hydrate increased with the increase of CaCl
concentration at large depressurization pressure and was mainly affected by pressure when the depressurization pressure was lower. MD simulations were used to give an atomic scale interpretation of the macroscopic results obtained from the experiment. The results showed that the addition of CaCl
destroyed the resistance liquid film formed during CH
hydrate dissociation, thus accelerating the dissociation process, in good agreement with experimental results. HIGHLIGHTS: • The amount of CaCl
affects CH
hydrate dissociation at large depressurization pressure. • The dissociation of CH
hydrate at low depressurization pressure is dependent on pressure. • Ca
destroys effectively the resistance liquid film produced during hydrate dissociation. • MD simulation results are in agreement with those of the experiment. |
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ISSN: | 0948-5023 |