A numerical flow model for the effective pore volume and permeability changes during hydrate formation/dissociation
H. Alkan and G. Pusch
Event name: ECMOR VII - 7th European Conference on the Mathematics of Oil Recovery
Session: Mathematics for Reservoir Modelling IX
Publication date: 08 September 2000
Info: Extended abstract, PDF ( 4.6Mb )
Price: € 20
A new modelling concept is presented to describe the effective gore volume and permeability changes of hydrated sediments during hydrate formation/dissociation. The principle is based on the use of the socalled dual-porosity function originally developed for the flow calculations in fractured reservoirs. A 3-D network consisting of cubic blocks is created for modeling the intergranular flow paths in hydrateshielded sediment grams. With the aid of a 3-D, 3-Phase reservoir simulator, this concept is used to evaluate the gas flow during hydrate dissociation in a core. The isothermal hydrate - dissociation is approximated by a Langmuir desorption function for pressure-related cage occupancy of gas hydrates. The model is validated by matching the dissociation data given in the literature for synthetically hydrated sandstone depressurisation.