Wells – Processes – Distinct – separate injection and producing wells
Patent
1981-04-30
1983-07-12
Novosad, Stephen J.
Wells
Processes
Distinct, separate injection and producing wells
166272, E21B 4324
Patent
active
043925308
ABSTRACT:
A method for recovering heavy oil from a subterranean, permeable, heavy oil-containing formation comprising injecting steam into the lower portion of the formation, injecting a controlled amount of unheated water into the upper portion of the formation and displacing the oil through the formation toward a production well where the oil is produced. The steam injection releases heat (BTU) to the heavy oil and formation reducing the viscosity of the oil and increasing its mobility for recovery. The sequence of injection of the water and steam is designed to yield the maximum oil recovery per BTU injected by increasing the volume of the formation subjected to heating and increasing the vertical sweep.
REFERENCES:
patent: 4166504 (1979-09-01), Brown et al.
patent: 4274487 (1981-06-01), Hollingsworth et al.
Dotson Billy J.
Odeh Aziz S.
Huggett Charles A.
Miller Lawrence O.
Mobil Oil Corporation
Novosad Stephen J.
Powers, Jr. James F.
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