Title: Production characteristics of gas hydrate reservoirs associated with steam injection and depressurisation rate

Authors: Seung Hee An; Si Le Van; Bo Hyun Chon

Addresses: KOGAS Research Institute, Korea Gas Corporation, 1248, Suin-Ro, Sangnok-Gu, Ansan-City, Gyeonggi-do 15328, Korea ' Department of Energy Resources Engineering, Inha University, 100 Inharo, Nam-gu, Incheon 22212, Korea ' Department of Energy Resources Engineering, Inha University, 100 Inharo, Nam-gu, Incheon 22212, Korea

Abstract: This study examined the gas production characteristics of gas hydrate using steam injection and depressurisation methods for representatives of unconsolidated reservoirs. The properties of the gas production rate were analysed at 20% depressurisation following the steam temperature (280 and 300°C) and steam injection time (30, 60, and 200 s) in an unconsolidated artificial reservoir in a 3D experiment. The dissociation time and gas production rate were analysed according to the depressurisation rate (40%, 50%, and 60%) under constant gas hydrate saturation in an unconsolidated artificial reservoir in a 1D experiment. The results showed that the production of methane gas increases with increasing gas saturation and longer steam injection time at a low temperature (280°C) compared to a high temperature (300°C). In addition, the use of hot water provided better efficiency than steam in terms of maintaining the heat for dissociation and production processes. [Received: December 12, 2016; Accepted: July 8, 2017]

Keywords: gas hydrate; steam injection; depressurisation rate; dissociation time; gas production rate.

DOI: 10.1504/IJOGCT.2018.095574

International Journal of Oil, Gas and Coal Technology, 2018 Vol.19 No.3, pp.296 - 315

Received: 14 Dec 2016
Accepted: 08 Jul 2017
Published online: 11 Oct 2018 *

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