Permeability changes affect CBM production predictions

The Palmer-Mansoori (P-M) theory of permeability changes incorporated into a pseudosteady-state equation can predict the approximate peak gas flow rate and decline with depletion for coalbed methane wells, when full reservoir modeling predictions are unwarranted.The predictions formulated in a risk-based model require a range of values for each input parameter and produce a range of gas flow rates. These quick screening model predictions can assess potential gas rates and profitability for various basins, at any stage of the exploration and exploitation process.The model allows for the prediction of 10% probability (P10) and 90% probability (P90) gas rates,Risk-based models for hypothetic...

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