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Gas Production from Hydrate-Bearing Sediments in Oman Sea: a Numerical Investigation
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 80th EAGE Conference and Exhibition 2018, Jun 2018, Volume 2018, p.1 - 5
Abstract
Natural gas hydrate resources have been the focus of several research efforts for some decades as a new source of energy. Modeling and simulation of the hydrate dissociation and corresponding thermodynamic effects in porous media helps to get a primary understanding of the reservoir behavior due to hydrate dissociation. That is an essential step before performing detailed complicated studies and determining production scenarios. Values of parameters may vary significantly among reservoirs located in different geographical areas. In this paper, we investigate the production of natural gas from hydrate-bearing sediments by depressurization of hydrate in Oman Sea, as a case study. Required parameters are estimated either from seismic processed data or using suitable correlations. An axisymmetric model is considered for the reservoir in which hydrate dissociation occurs on a sharp front separating the reservoir to dissociated and undissociated hydrate zones. An explicit finite difference scheme is used for numerical solution of gas filtration and energy equations. Curves for pressure and temperature variations in the reservoir and change of the production rate during 40 days of production are presented and discussed. It is found out that temperature and pressure are constant within dissociated hydrate zone.