E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/31
E21B 43/22 (2006.01)
Patent
CA 1194783
A METHOD OF RECOVERING OIL FROM A VISCOUS OIL-CONTAINING SUBSURFACE FORMATION Abstract Oil is recovered from a viscous oil-containing formation, including a tar sand deposit, by first establishing a fluid communication path 18 in the lower portion of the formation 10 intermediate at least one injection well 12 and a production well 14. A hydrocarbon solvent having a density less than oil contained in the formation and a viscosity not greater than 1/100 the viscosity of the oil contained in the formation under formation conditions is injected into the communication path 18 and fluids including oil are recovered from the production well 14 until the fluid recovered contains an unfavorable ratio of oil to solvent. The production well 14 is then shut-in and an additional quantity of the hydrocarbon solvent is injected into the fluid communication path 18, preferably until a total amount of between 0.05 to 0.30 pore volume. The injection well 12 is then shut-in along with the production well 14 to permit the formation to undergo a soak period for a variable time, preferably for a time of between 2 to 20 days per vertical thickness in feet of oil-containing formation 10. A driving fluid such as water is then injected into the formation 10 via the injection well 12 and the oil is produced until there is an unfavorable ratio of oil to driving fluid. During the fluid drive recovery phase, the injection well 12 and production well 14 may be completed to be in fluid communication with the entire portion of the formation to obtain a more uniform displacement of the upgraded formation oil by the driving fluid.
419021
Fitch John L.
Mullins Lynn D.
Gowling Lafleur Henderson Llp
Mobil Oil Corporation
LandOfFree
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