Effect of the Degree of Oil Biodegradation on the Crystallization of Methane Hydrate and Ice in Water-Oil Emulsions


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To study the influence exerted by oxidized oil components on the nucleation and growth of gas hydrates the nucleation of methane hydrate and ice in 50 wt % emulsions of oil in native oil and two samples of the same oil subjected to biodegradation for 30 and 60 days (samples N, V30, and V60, respectively) were examined. In the course of measurements, the samples were cooled to–15°C at a constant rate of 0.14 deg min–1 and then heated to the initial temperature. The initial methane pressure in the system was 15 MPa at 20°C. In the process, the temperatures were recorded at which heat effects corresponding to the formation of hydrate/ice and the melting of these. In the case of emulsion N, no exothermic effects were manifested in the cooling stage. In the heating stage, the endothermic effects of ice melting were found in half of the samples. No effects corresponding to the decomposition of the hydrate were observed. In experiment with V30 samples, the formation of the hydrate and ice was manifested as strong exothermic effects. Ice was formed in all the experiments, and the hydrate, only in 21% of the samples. Finally, in experiments with V60, ice and the hydrate were formed in 54 and 13% of cases, respectively. Their formation was manifested as weak exothermic effects in the cooling stage. Thus, it was demonstrated that the biodegradation level of oil samples affects the nucleation of methane hydrate and ice in emulsions formed on the basis of these samples.

作者简介

A. Stoporev

Nikolaev Institute of Organic Chemistry, Siberian Branch; Novosibirsk State University; Gubkin Russian State University of Oil and Gas (National Research University)

Email: manakov@niic.nsc.ru
俄罗斯联邦, Novosibirsk, 630090; Novosibirsk, 630090; Moscow, 119991

L. Svarovskaya

Institute of Oil Chemistry, Siberian Branch

Email: manakov@niic.nsc.ru
俄罗斯联邦, Tomsk, 634055

A. Semenov

Gubkin Russian State University of Oil and Gas (National Research University)

Email: manakov@niic.nsc.ru
俄罗斯联邦, Moscow, 119991

L. Strelets

Institute of Oil Chemistry, Siberian Branch

Email: manakov@niic.nsc.ru
俄罗斯联邦, Tomsk, 634055

L. Altunina

Institute of Oil Chemistry, Siberian Branch

Email: manakov@niic.nsc.ru
俄罗斯联邦, Tomsk, 634055

A. Manakov

Nikolaev Institute of Organic Chemistry, Siberian Branch; Novosibirsk State University

编辑信件的主要联系方式.
Email: manakov@niic.nsc.ru
俄罗斯联邦, Novosibirsk, 630090; Novosibirsk, 630090

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