E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/31
E21B 43/28 (2006.01)
Patent
CA 1228020
F-2524 SOLVENT ASSISTED STEAM INJECTION PROCESS FOR RECOVERY OF VISCOUS OIL ABSTRACT A method for recovery of viscous oil from a subterranean, viscous oil-containing formation employing mixture of steam and 2 to 5% of a light solvent having an equilibrium K-value of at least 0.5 at initial formation temperature and pressure that results in maximum solvent efficiency based upon the ratio of cumulative oil recovered to the amount of solvent injected and unrecovered. A predetermined amount of a mixture of steam and 2 to 5% by volume of a light solvent having the desired equilibrium K-value is injected into the lower 50% or less of the formation via an injection well and fluids including oil and a portion of the light solvent are produced from the upper 50% or more of the formation via a spaced-apart production well. The amount of steam injected is 0.30 to 0.50 pore volume at a temperature of 500°F to 700°F, a quality of 50 to 90%, and an injection rate of 4 to 7 barrels (CWE) per day per acre-foot of formation. Thereafter, production of fluids including oil and light solvent is continued until steam breakthrough occurs or until the fluid being produced contains a predetermined amount of water, preferably at least 95%. The method is applied to a viscous oil-containing formation in which either naturally occurring or induced communication exists between the injection well and the production well in the bottom zone of the formation. Suitable light solvents include C1 to C4 hydrocarbons and carbon dioxide. In another embodiment of the invention, injection of the mixture of steam and solvent may be continued and fluids including oil and solvent are produced until steam breakthrough occurs or until the water cut of the produced fluid contains at least 95% water.
467976
Hartman Kathy J.
Shu Winston R.
Gowling Lafleur Henderson Llp
Mobil Oil Corporation
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