The D coefficient can be estimated from well and rock properties

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Presentation transcript:

The D coefficient can be estimated from well and rock properties D is in 1/(Mscf/d) b is the non-Darcy flow coefficient (in 1/ft) g is the gas gravity (air = 1) All other properties in field units. This equation assumes radial flow. It often underestimates the importance of non-Darcy flow – perhaps due to non-radial flow near the well perforations. September 21, 2019 e-notes (c) Curtis H. Whitson

Correlations for Non-Darcy flow coefficient vs permeability September 21, 2019 e-notes (c) Curtis H. Whitson