A hydrocarbon miscible flood was in-itiated in the Wizard Lake D-3A pool in late 1969. The scheme involvedplacing a slug of LPG at the gas-oil interface, and displacing it vertically downward with dry gas while injecting water to stabilize the oil-water contact. Ultimate recovery is expected to be 323 million stock tank barrels, 84 percent of the original oil-in-place and 69 million stock tank barrels higher than under primary depletion. M.N. YoungThe Wizard Lake D-3A pool, located in central Alberta, is one of nine Devo-nian reef pools connected to the C,'Ook-ing Lake aquifer. It is a dolomitized bioherm reef with a maximum ori--inal oil zone of 648 feet. The pool was con-sidered an ideal candidate fora miscible displacement process because of itv ver-tical relief, small areal extent and the absence of any barriers that would be detrimental to displacement Of the slue. This paper reviews the implementa-tion, monitoring techniques and perforMarshall N. Young holds a Bachelor of Science degree in mechanical engineering obtained at the University of Saskat-chewan in 1962. Since graduation, he has worked in the petroleum industry in Western Canada in operations, economic evaluations,
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