Horizonlal injectors rejuvenate mature miscible flood-south swan hills field

摘要

The South Swan Hills pool, located in northwest Alberta, is a carbonate reef with an original oil in place (OOIP) of approxi- mately 850 million bbl. Waterflooding began in 1963, and a staged hydrocarbon miscible flood covering most of the field began in 1973. solvent injection in the main miscible flood was terminated in 1989, and chase gas injection cased in 1998. In 1994, however, solvent injection was reinitiated into a single pattern in the reef margin area of the field using a horizontal injector and reduced well spacing.