This study is an analysis of individual well-recovery data on 79 wells completed by one operator in the Smithwick (Gray) limestone of Pennsylvanian age, in the Breckenridge field, Stephens County, Texas.

The Smithwick (Gray) limestone has been variously called “brown lime,” “white lime,” and “Breckenridge lime” to differentiate it from its stratigraphic equivalent, the Caddo (Black) limestone of the Necessity-Caddo area.

This study includes all the wells drilled by the one operator in the Breckenridge field, excepting: several wells on which full information was not readily available, or which produced oil in very small quantities; one well which was “exceptional”...

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