Coal Seam Reservoir

Models

Sigra can model the behavior of coal seam reservoirs using two kinds of model.

The first is SIMED, which is an industry accepted finite difference model that is maintained by CSIRO. Whilst this can handle quite complex reservoirs, its use of time delay (tau) to simulate desorption, and limited models to handle the effects of changing effective stress (stress path), mean that it is not as flexible to use as Sigra’s own finite element reservoir model behaviour. This model may be used for simple geometries and in particular for the near well bore area. It handles the stress path related permeability more accurately and directly.

ccrExample of drainage times versus permeability with respect to hydraulic fracture spacing for a particular coal seam, generated by one of Sigra’s coal seam reservoir models.

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