Method for enhanced oil recovery

Details Method for enhanced oil recovery Method for enhanced oil recovery

E - Fixed Constructions

21

B

166/33

E21B 43/20 (2006.01) E21B 43/16 (2006.01)

Patent

CA 1122116

ABSTRACT OF THE DISCLOSURE The present invention is directed to an improved method for enhanced recovery of oil from relatively "cold" reservoirs by carbon dioxide flooding. In oil reservoirs at a temperature less than the critical tem- perature of 87.7°F and at a pore pressure greater than the saturation pressure of carbon dioxide at the temperature of the reservoir, the carbon dioxide remains in the liquid state which does not satisfactorily mix with the oil. However, applicants have found that carbon dioxide can be vaporized in situ in the reservoir by selectively reducing the pore pressure in the reservoir to a value less than the particular saturated vapor pressure so as to greatly enhance the mixing of the carbon dioxide with the oil.

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