Journal
MOLECULAR PHYSICS
Volume 114, Issue 1, Pages 34-43Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00268976.2015.1081708
Keywords
Methane hydrate; dissociation; inorganic salts; molecular dynamics simulation
Funding
- National Basic Research Program of China [2015CB251200]
- Fundamental Research Funds for the Central Universities [15CX02008A, 14CX06030A]
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Hydrate plugging is a hidden threat to the safe exploitation of oil and gas. Inorganic salts are widely used as thermodynamic inhibitors to effectively prevent the hydrate formation. This study uses a molecular dynamics method to explore the mechanism of the hydrate dissociation via inorganic salts on the micro-scale. We simulated the dissociating process of methane hydrate under different concentration series of NaCl, KCl and CaCl2 solutions at 273K, and analysed the changes of ionic structure, transport parameters and kinetic energy in the system of inorganic salt/hydrate. The simulation results successfully revealed the step-by-step dissociation of hydrate, and the differences in dissociation rates among the different inhibitors. The energy needed for hydrate dissociation alters for different inorganic solutions; the energy reaches maximum when KCl is the inhibitor, and lowest when the concentration of CaCl2 exceeds 30% w/w. We calculated the coordination numbers of all components, including oxygen atoms, cations and anions, and also their diffusion coefficients; analysed the effects of the three inorganic salts on the simulated hydrate structure and its transport; in addition, investigated the mechanism of hydrate dissociation via inorganic salts. [GRAPHICS]
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