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Estimation of Unconventional Reservoir Matrix Permeability and Pore Volume Using Rate-Transient Analysis Techniques: Method Refinements

A core analysis procedure based on rate-transient analysis theory has been successfully tested in the lab. Two permeability estimates and one pore volume estimate are possible using this technique, with the results being achieved faster than conventional testing (e.g. pulse-decay test). Refinements in one permeability estimation method, based on the distance of investigation, were illustrated. The combination of the rate-normalized pseudopressure derivative, used to identify the end of linear flow, and a new expression for DOI, yielded permeability values very close to the pulse-decay method.