The Pictured Cliffs Sandstone is a large, low permeability, gas producing reservoir. It is considered to belong to a class of reservoirs known as volumetric or bounded cylindrical reservoirs where the wells are surrounded by impermeable (or semi-permeable) boundaries.

In the Pictured Cliffs reservoir, the advancement of the drainage radius is shown to reach its maximum limit at the end of the transient period of the pressure decline versus time curve.

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