METHOD FOR STIMULATING OIL RECOVERY FROM AN UNDERGROUND RESERVOIR

摘要

METHOD FOR STIMULATING OIL RECOVERY FROM AN UNDERGROUND RESERVOIR Oil recovery from an underground reservoir is stimulated by injecting during a first stage of a fluid injection process a miscible flooding medium at a supercritical velocity through the reservoir until the flooding medium has travelled more than 90% of the distance from the injection well to a production well, whereupon the injection rate of the flooding medium is reduced to produce during a second stage of the process a displacement velocity in the reservoir less than the critical velocity at which fingering of the flooding medium through the displaced oil occurs.