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3808
1-D Modeling of Hydrate Decomposition in Porous Media
Abstract:
This paper describes a one-dimensional numerical model for natural gas production from the dissociation of methane hydrate in hydrate-capped gas reservoir under depressurization and thermal stimulation. Some of the hydrate reservoirs discovered are overlying a free-gas layer, known as hydrate-capped gas reservoirs. These reservoirs are thought to be easiest and probably the first type of hydrate reservoirs to be produced. The mathematical equations that can be described this type of reservoir include mass balance, heat balance and kinetics of hydrate decomposition. These non-linear partial differential equations are solved using finite-difference fully implicit scheme. In the model, the effect of convection and conduction heat transfer, variation change of formation porosity, the effect of using different equations of state such as PR and ER and steam or hot water injection are considered. In addition distributions of pressure, temperature, saturation of gas, hydrate and water in the reservoir are evaluated. It is shown that the gas production rate is a sensitive function of well pressure.
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References:

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[3] Sun, X. Nanchary, N. and Mohanty K. K.: 1-D Modeling of Hydrate Depressurization in Porous Media. Transp Porous Med (2005) 58:315- 338.
[4] Gerami, S., and Pooladi-Darvish, M.: Predicting Gas Generation by Depressurization of Hydrates where the Sharp-Interface Assumption is Not Valid, Accepted (January 2006) for publication in Journal of Petroleum Science and Engineering.
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[7] Uddin, M., Coombe, D. A., Law, D. A., Gunter, W. D.: Numerical Studies of Gas-Hydrate Formation and Decomposition in a Geological Reservoir. SPE100460.
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