Method of conducting a miscible carbon dioxide and solvent flood in a steeply dipping reservoir

Patent · Tue Feb 18 04:00:00 EST 1986

OSTI ID:6086703

Kokolo, G P

This patent describes a method of conducting a miscible carbon dioxide and solvent flood in a steeply dipping reservoir. This method consists of: 1.) injecting through at least one injection well a mixture of carbon dioxide and enriching hydrocarbon solvent at the updip end of a dipping hydrocarbon reservoir for forming a carbon dioxide and solvent front advancing to the downdip end of the reservoir. This enriching solvent mixed with the carbon dioxide in a concentration sufficient to achieve at least multiple contact miscibility between the mixture and the underground hydrocarbons at a point of injection into the reservoir; 2.) decreasing the concentration of hydrocarbon solvent in carbon dioxide, while maintaining at least multiple contact miscibility between the injected mixture of carbon dioxide and decreased concentration solvent and the underground hydrocarbons as the carbon dioxide and solvent front moves downdip, the concentration of solvent decreased as the concentration of solvent needed to maintain at least multiple contact miscibility decreases with increasing vertical depth in the formation; and 3.) recovering hydrocarbons and carbon dioxide from at least one production well located downdip of the injection well.

• Assignee: Texaco, Inc., White Plains, NY
• Patent Number(s): US 4570712
• OSTI ID: 6086703
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
CARBON DIOXIDE INJECTION
DEPTH
DIMENSIONS
DISPERSIONS
ENERGY SOURCES
ENHANCED RECOVERY
FLUID INJECTION
FOSSIL FUELS
FUELS
HYDROCARBONS
MISCIBLE-PHASE DISPLACEMENT
MIXTURES
OIL WELLS
ORGANIC COMPOUNDS
PETROLEUM
QUANTITY RATIO
RECOVERY
SOLUBILITY
SOLVENTS
WELLS