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Mechanical Model of Methane Hydrate Self-Preservation in a Gaseous Medium

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Abstract—

The distinctive features of methane hydrate decomposition in gaseous and water media under the conditions of thermobaric phase instability of methane hydrates are considered. In the course of preceding field observations it has been established that methane hydrate decomposes significantly more rapidly in the water medium as compared with the gaseous methane medium. The basic idea consists in the fact that methane hydrate decomposition takes place inside methane hydrate fractures in which there are decomposition nuclei. Deceleration of methane hydrate decomposition is caused by the formation of ice plugs in the local zones of methane hydrate decomposition, namely, in the fractures. An ice plug is formed as a result of local methane hydrate decomposition into gas and water and intense heat consumption. In the process of freezing, water forms the plug and thereby blocks methane hydrate decomposition in the fracture. Relatively low heat conduction of gaseous methane protects the ice plugs against rapid melting.

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ACKNOWLEGMENT

The author wishes to thank R.I. Nigmatulin and A.V. Egorov for useful discussion and the pilot of the “Mir” deep-water manned vehicle E.S. Chernyaev for video recording of the processes of decomposition of deep-water methane hydrates.

Funding

The paper is prepared within the framework of the Program of the Russian Academy of Sciences no. 1.2.49 and the theme of the State Program no. № AAAA-A20-120011690131-7.

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  1. Ishlinsky Institute for Problems in Mechanics of the Russian Academy of Sciences, Moscow, Russia

    A. N. Rozhkov

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  1. A. N. Rozhkov
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Correspondence to A. N. Rozhkov.

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Translated by E.A. Pushkar

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Rozhkov, A.N. Mechanical Model of Methane Hydrate Self-Preservation in a Gaseous Medium. Fluid Dyn 56, 93–105 (2021). https://doi.org/10.1134/S0015462821010110

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