Wells – Processes – Distinct – separate injection and producing wells
Patent
1976-11-09
1978-08-29
Novosad, Stephen J.
Wells
Processes
Distinct, separate injection and producing wells
166272, 166274, E21B 4322, E21B 4324
Patent
active
041097203
ABSTRACT:
Petroleum may be recovered from viscous petroleum-containing formations including tar sand deposits by injecting into the formation a solvent which is liquid at formation conditions and simultaneously therewith injecting a substance which will remain totally gaseous at the pressure and temperature conditions existing within the reservoir. The presence of noncondensible gas in the formation into which solvent is being injected prevents formation of a impremeable bitumen bank which blocks the further flow of fluids through the formation. The gas should be essentially unreactive with the solvent and formation fluids in order to obtain the desired benefits. Examples of suitable gases for the practice of this invention include methane, ethane, nitrogen, carbon dioxide, and mixtures thereof.
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Allen Joseph C.
Redford David A.
Novosad Stephen J.
Park Jack H.
Ries Carl G.
Suchfield George A.
Texaco Exploration Canada Ltd.
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