Dr. Smolen provides long awaited information on the uses of cased hole logging tools in the following recovery/workover applications: formation evaluation through casing; mechanical integrity, cement bond evaluation, and casting inspection surveys; flow evaluation in production and injection wells. Contents: Cased hole environment and operations Classification of cased hole logs based on primary region of investigation Production potential through casing Cement annular fill and/or compressive strength Casting inspection techniques Fluid movement in and behind pipe Special problems.