1.
n. [Well Testing]
A
flow regime that occurs when the predominant flow pattern in the
reservoir is toward a point. Spherical flow occurs for
partial penetration and limited-entry completions. This flow regime is recognized as a -1/2 slope in the
pressure derivative on the log-log diagnostic plot. Its presence enables determination of the spherical
permeability. When spherical flow is followed by radial flow, both horizontal and vertical permeability can be quantified.