Method of recovering oil by in-situ produced carbon dioxide
This is a method of recovering oil wherein the oil is displaced from a reservoir by a gaseous phase which is developed within the reservoir. Air is injected into and forced through the reservoir to a production well to establish gas permeability in the reservoir. The reservoir around the injection well is heated to initiate combustion of the reservoir materials. Introduction of air is continued until the combustion has continued through about 10% of the distance from the injection well to the production well. The flow of air is stopped and the pressure within the injection well is reduced to effect backflow of fluids toward the injection well. An oxidizing fluid, at least 66 to 95% by volume of pure oxygen, is introduced and combustion reinitiated and continued until an oil-miscible gaseous phase equal in quantity to from about 2 to 20% of the hydrocarbon pore volume has been developed. The flow of oxidizing fluid is stopped and a driving fluid is introduced to force the gaseous phase through the reservoir to displace the oil which, in turn, can be produced through the production well. (2 claims)
- Assignee:
- TUL; EDB-81-084748
- Patent Number(s):
- US 3174543
- OSTI ID:
- 6470192
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300* -- Petroleum-- Drilling & Production
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION
ENERGY SOURCES
ENGINEERING
ENHANCED RECOVERY
FLUID INJECTION
FOSSIL FUELS
FUELS
IN-SITU COMBUSTION
IN-SITU PROCESSING
MISCIBLE-PHASE DISPLACEMENT
OIL WELLS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PETROLEUM
PROCESSING
RECOVERY
RESERVOIR ENGINEERING
THERMAL RECOVERY
THERMOCHEMICAL PROCESSES
WELLS