A tertiary extension of the existing secondary hydrocarbon miscible flood in the Wizard Lake D-3A Pool was implemented in October, 1983. The extension will result in the oil-water contact being lowered 22.6 meters (74.1 feet) to allow miscible displacement of the residual oil in the water flushed portion of the reef. This water flushed zone was formed when the oil-water contact rose during primary depletion of the reservoir from discovery in 1951 until the implementation of the secondary miscible flood in 1969, and also during the repressuring phase of the secondary miscible flood. Ultimate recovery from the pool is expected to be 59 539 103m3 (374.49 MMSTB) or 95.95 percent of the original oil-in-place; which is 4 531 103m3 (28.50 MMSTB) higher than the secondary miscible flood and 18 583 103m3 (116.88 MMSTB) more than under primary depletion.

This paper reviews the implementation and monitoring of the tertiary extension of the miscible flood and also the performance of the pool to January 1, 1984.

Keywords:
mmstb, tertiary extension, flood, saturation, miscible flood, subsea, residual oil saturation, wizard lake, secondary miscible flood, oil-water contact
Subjects:
Well & Reservoir Surveillance and Monitoring, Reservoir Characterization, Fluid Characterization, Improved and Enhanced Recovery, Reservoir Simulation, Formation Evaluation & Management, Reserves Evaluation, Phase behavior and PVT measurements, Waterflooding, Miscible methods
Copyright 1984, Society of Petroleum Engineers of AIME
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