This article will portray the advancement in technology of Drill Stem Testing through the period 1926 to 1966. Early day pressure recordings were disregarded in favor of recovery until about 1951, at which time the first steps were made to utilize the pressure charts for the application of the then existing mathematical equations to advance Drill Stem Testing into a scientific formation evaluation process. The article will also point out the increased well data when Drill Stem Testing supplements Electric logging, supplying the data which is unattainable by logging alone. It will also review methods and procedures used to obtain productivity, permeability, well bore damage (Damage Ratio), potential production capabilities, radius of investigation during test, potentiometric surface, and on some tests, depletion and barriers will be detectable.

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