Secondary recovery of oil from a subterranean formation

Patent · Tue Jul 26 04:00:00 EDT 1966

OSTI ID:6760271

Elfrink, E B; Sharp, L G

In a method of recovering oil by a miscible phase displacement technique, the flood efficiency is improved by the use of carbon dioxide. Carbon dioxide is injected into a well to drive oil ahead of it. This forms a first transition zone in which part of the carbon dioxide is mixed with the oil, this mixture being followed by carbon dioxide. A hydrocarbon is injected into the well behind and into contact with the carbon dioxide to form a second transition zone. Enough pressure on the hydrocarbon is maintained to keep it liquid in the reservoir. A driving fluid is then injected into the well to displace oil in the 2 transition zones and the liquefied hydrocarbon toward a production well from which the oil is recovered. The carbon dioxide may be injected as a liquid. (5 claims)

• Assignee: Mobil Oil Corp.
• Patent Number(s): US 3262498
• OSTI ID: 6760271
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
CARBON DIOXIDE INJECTION
EFFICIENCY
ENERGY SOURCES
ENGINEERING
FLUID INJECTION
FLUIDS
FOSSIL FUELS
FUELS
LIQUEFIED PETROLEUM GASES
LIQUIDS
MISCIBLE-PHASE DISPLACEMENT
NATURAL GAS LIQUIDS
OIL WELLS
PETROLEUM
PETROLEUM PRODUCTS
RESERVOIR ENGINEERING
STIMULATION
WELL STIMULATION
WELLS