Abstract
Numerical studies are performed with the two-dimensional axisymmetric model of gas hydrate decomposition in porous media under the action of microwave heating. The system of equations describing the above process includes the mass balance equations of gas, water and hydrate phases, the energy balance equation, generalized Darcy’s law for water and gas, and the Kim–Bishnoi kinetics equation for hydrate decomposition reaction. The system of equations resolves itself into four differential equations relative to temperature, pressure, volume hydrate, water, and gas saturation with appropriate boundary and initial conditions. Simulation of gas hydrate decomposition in porous media under the action of microwave heating is carried out by finite element method. Physical parameters characteristic of a typical hydrate reservoir are used in the modeling. The reservoir was heated for ten days. Spatial and temporal distribution of temperature, pressure, hydrate, water, and gas saturation were obtained. The mass of gas evolved during hydrate dissociation was determined. The calculation of the energy efficiency of electromagnetic heating was carried out. These results are quite usable from a practical standpoint, and the electromagnetic heating method is technically achievable and competitive.
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