Reservoir Analysis of the Redwater Pool

CIM Bulletin, 1951


The Redwater pool, in north-central Alberta, was discovered in October, 1948, and at the end of 1950 was about 85 per cent developed. Production is from a Devonian coral limestone reef and is found at an average depth o:f 3,150 feet. The pool has an estimated .productive area of 37,000 acres, and a maximum oil zone thickness of slightly over 200 feet. Wide variations exist in both type and values of porosity, with the avera age value determined for the reservoir being 6.16 per cent. The total stock tank oil in place is about 1.24 billion barrels. The crude has a saturation pressure of 485 psig, compared to the original value of 1,050 psig for the reservoir, and the principal recovery mechanism so far has been the natural water drive. Cumulative production to January 1st, 1951, has been about 15.5 million barrels. These withdrawals resulted in a reservoir pressure decline of slightly over 100 psi. Predictions of future behaviour indicate that the water drive will not be of sufficient magnitude to maintain the reservoir above saturation pressure past 1953, and that, with natural depletion, the pool will ,be produced largely by a solution gas drive. Pressure maintenance by water injection has been considered -and the possibility of raising the pressure to the original value of 1,050 psig is also discussed.
Keywords: connate water, porosity, Redwater., Reservoir Oil, Sampling pressure-psig., limestone, Oil, Oils, Porosity, Pressure, Production, Reefs, Water, Waters, Wells