New test procedures optimize surfactant blends

A new technique, which makes use of a fluid's capacity to conduct electricity, shows great promise in evaluating the apparent wettability of spacer and preflush fluids.Laboratory evaluation of these fluids, which precondition surfaces before conducting cement operations, has helped reduce surfactant costs by as much as 50% while minimizing costly zonal isolation problems.This first of a two-part series describes new test procedures and equipment for testing apparent wettability and provides additional theoretical background for describing oil and water-wet phase behavior.The conclusion describes use of this new technology in a field setting operated by Chevron Inc.BackgroundBecause ce...

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