International Journal of Offshore and Polar Engineering · 2009 · 38 citations · 0 references
EngineeringEarth SciencesGeologyReservoir EngineeringReservoir SimulationSubsurface Fluid FlowGas Hydrate ReservoirsPermeability AnalysisPermeability CharacterizationPermeability EstimationPermeability EvaluationReservoir GeologyDissociation BehaviorGas Hydrate DissociationHydrate Dissociation ModelingLatent HeatRadial FlowRelative Permeability ModelingSubsurface Fluid Flow In Hydrate SystemsThermal Conductivity
We conducted an experimental study on the dissociation of methane hydrate (MH) and gas production behavior by depressurization in sediments. To reproduce the actual flow condition of gas and water, disc-shaped samples of MH in sediments were used. Horizontal radial flow in porous media during MH dissociation was studied under a variety of vertical loads in order to reproduce field conditions in real MH sediments. From experimental observations, it was found that the MH dissociation consisted of 2 stages due to the latent heat of sediments and thermal conduction. Based on experimental results, we carried out numerical simulations of laboratory-scale experiments for depressurization. Thermal conductivity that dominated dissociation behavior was optimized. Further, we formulated realistic relative permeability curves that allowed us to reproduce the gas-water production behavior under the existence of MH.