Control of gravity segregation by high density fluid injection
Gravity segregation is controlled and oil recovery is enhanced by the controlled injection of a high density miscible fluid, such as carbon dioxide, into an oil-bearing formation. Pressure within the formation is maintained so that the density of the injected fluid is equal to or as close to that of the oil as possible. Generally, the density of the miscible fluid should be maintained within about 10% of the density of the oil to be displaced. Mixtures of the miscible fluid and displaced oil are produced from the lower portions of the reservoir so that the miscible fluid will sweep the entirety of the reservoir and thereby avoid bypassing oil by gravity segregation of oil and miscible fluid. (7 claims)
- Assignee:
- Cities Service Oil Co.
- Patent Number(s):
- US 3661208
- OSTI ID:
- 5924739
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300* -- Petroleum-- Drilling & Production
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
ENERGY SOURCES
ENHANCED RECOVERY
FLUID INJECTION
FOSSIL FUELS
FUELS
GEOLOGIC DEPOSITS
MINERAL RESOURCES
OIL WELLS
OXIDES
OXYGEN COMPOUNDS
PETROLEUM
PETROLEUM DEPOSITS
RECOVERY
RESERVOIR PRESSURE
RESERVOIR ROCK
RESOURCES
SEPARATION PROCESSES
STIMULATION
WELL STIMULATION
WELLS