The water-alternating-steam process (WASP) was implemented in a one-pattern field trial to control downdip steam breakthrough in a steeply dipping reservoir. The process was implemented because simulation studies of the trial area showed that WASP was technically and economically more effective than conventional rate reductions and foam diverters in correcting downdip steam breakthrough problems.

After two complete cycles, monitoring data was analyzed to determine the technical effectiveness of WASP in reducing reservoir temperatures and in maintaining both reservoir pressure and pattern production. In addition, the economic impact of WASP on thermal efficiency and economics was compared against predicted baseline performance.

Actual field results were also compared to performance predicted from simulation studies to evaluate the effectiveness of simulation in: (1) designing the initial cycle lengths and rates for the WASP field trial, and (2) qualitatively modeling the effect of WASP on the steam zone and project performance.

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