white rose oilfield development application - Husky Energy

4.2.1.3 West Avalon PoolOnly one well, J-49, has been drilled in the West Avalon Pool. The pool is expected to have an averagegas column thickness of 122 m and an oil column of 59 m. The OGIP for the pool is estimated to bebetween 23 and 37 billion m 3 . The OOIP is estimated to be between 32 and 42 million m 3 , with provenplus probable (P50) volumes of 37 million m 3 . On this basis, the pool is expected to containapproximately 35 percent OGIP and 20 percent of the OOIP in the Avalon Formation.This pool is also expected to be of poorer reservoir quality than the South Avalon Pool, with an averagepermeability in the order of 90 mD.4.2.2 Reservoir Exploitation4.2.2.1 Reservoir Simulation Model – South Avalon PoolA three-dimensional reservoir model was developed for the South Avalon Pool to evaluate depletionoptions for the pool. For reference case reservoir performance determinations, all faults were assumedto be sealing.A waterflood scheme was used for the reference case development. Several model runs were made todetermine the horizontal well locations that would result in optimum recoveries from the model. A totalof 10 production wells and seven water injection wells were required to optimize reservoir performancein the model. Horizontal water injection wells were placed well below the oil-water contact to ensuredispersion of the injection water. The location of the horizontal oil producers was based on optimizingrecoveries, while maximizing the time to water and/or gas break through.The recovery for the South Avalon Pool was approximately 39 percent. On a fault block by block basis,recoveries varied from 29 to 50 percent.A fundamental assumption for the waterflood development case is excess produced gas is conserved byreinjecting it into another pool in the White Rose field. Current plans are to drill the first gas injector inthe North Avalon Pool in the N-22 area. After some reservoir response is seen, a decision will be madeas to the number, timing and location for additional gas injectors, if they are required. Areas forpotential future gas injector locations include the North Avalon Pool, the West Avalon Pool and thesouth end of the Terrace block in the South Avalon Pool.White Rose DA Project Summary • January 2001 Page 50