Wells – Processes – Distinct – separate injection and producing wells
Patent
1979-04-30
1980-09-30
Novosad, Stephen J.
Wells
Processes
Distinct, separate injection and producing wells
166274, E21B 4320, E21B 4322
Patent
active
042249929
ABSTRACT:
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 temperature of 87.7.degree. 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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patent: 3623552 (1971-11-01), Vairogs
Comberiati Joseph R.
Kamath Krishna I.
Locke Charles D.
Denny James E.
Hamel Stephen D.
Larcher Earl L.
Novosad Stephen J.
The United States of America as represented by the United States
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