Abstract
Summary Shell Expro and Koninklijke/Shell E&P Laboratorium (KSEPL) have been engaged in a multidisciplinary effort to deter mine the waterflood residual oil saturation (ROS) in two principal reservoirs of the Cormorant oil field in the U.K. sector of the North Sea. Data acquisition included special coring and testing. The study, which involved new reservoir-engineering and petrophysical tech niques, was aimed at establishing consistent ROS values. Reservoir-engineering work centered on reservoir-condition corefloods in the relative-permeability-at-reservoir-conditions (REPARC) apparatus, in which restoration of representative wettability conditions was attempted with the aging technique. Aging results in a con sistent reduction of water-wetness of all core samples. The study indicated that ROS values obtained on aged cores at water throughputs of at least 5 PV represented reservoir conditions. The petrophysical part of the study involved ROS estimation from sponge-core analy sis and log evaluation.
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