A gravity-stable, vertical C02 miscible injection flood was implemented in the 824 feet thick Wellman Unit Wolfcamp reef reservoir in July 1983. C02 is being injected in the crest of the reservoir to displace the oil vertically downward. The producing wells areconstantly being plugged down out of the "gassed out" interval into the oil bank.

The purpose of this paper is to present the results of the PND®-S through tubing logging tool as a method to determine the C02/oil/water contacts and the use of multiple inflatable packers/sliding sleeve plugdown assemblies to achieve zonal isolation between "gassed out" intervals and producing intervals.

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