PULSED-NEUTRON DECAY-SPECTRUM DATA AND MULTI-INFLATABLE-PACKER PLUGDOWN ASSEMBLIES IMPROVE OIL PRODUCTION-RATES

A gravity-stable, vertical CO2-miscible-injection flood was implemente d in the 824-ft-thick Wellman Unit Wolfcamp reef reservoir in July 198 3. CO2 is injected in the crest of the reservoir to displace the oil v ertically downward. The producing wells are constantly plugged down ou t of the ''gassed-out'' interval into the oil bank. This Paper present s the results of the PND(R)-S through-tubing logging tool as a method to determine the CO2/oil/water contacts and the use of multiple-inflat able-packer/sliding-sleeve plugdown assemblies to achieve zonal isolat ion between gassed-out and producing intervals.