| http://www.w3.org/ns/prov#value | - Referring now to FIG. 1, the upper and lower packer means 48 and 20, respectively, are longitudinally spaced by a distance sufficient that the sealed well annulus zone 50 has a volume sufficient that well fluid, such as drilling mud or water, trapped in the sealed well annulus zone 50 may be compressed upon movement of actuating piston 46 downward from its first position illustrated in FIG. 2A to
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