Process for predicting porosity and permeability of a coal bed

Details Process for predicting porosity and permeability of a coal bed Process for predicting porosity and permeability of a coal bed

G - Physics

01

N

G01N 15/08 (2006.01) B01D 53/04 (2006.01) B01J 8/02 (2006.01) E21B 49/08 (2006.01) G01N 33/24 (2006.01) G01V 9/00 (2006.01) B65G 5/00 (2006.01) E21C 39/00 (2006.01)

Patent

CA 2438134

A method for predicting the secondary porosity system (SPS) porosity, and thereby permeability, of a coal bed involves determining an initial condition in the coal bed, including an initial SPS pressure and an initial sorbed gas composition, determining a pressure strain effect due to increasing the SPS pressure to a value greater than the initial SPS pressure, and determining a sorption strain effect due to changes in the sorbed gas composition resulting from decreasing the methane content and increasing the content of a stronger adsorbing fluid (SAG) relative to the initial sorbed gas composition. Preferably, the method uses data from test injections of water and/or a weaker adsorbing fluid (WAG) and a SAG. The data is used in the inventors' model to compute a SPS porosity and an absolute permeability at a reference SPS pressure and a reference sorbed gas composition. Preferably, the reference pressure is atmospheric pressure. The inventors' model accounts for both dynamic pressure strain and dynamic multicomponent sorption strain effects. As a result, a calibrated model can be produced for the coal bed for predicting the coal bed's SPS porosity, and thereby permeability, as a function of a pre-selected injection or production fluid's composition and/or SPS pressure conditions.

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