Wells – Processes – Specific pattern of plural wells
Patent
1980-06-30
1982-12-07
Novosad, Stephen J.
Wells
Processes
Specific pattern of plural wells
166263, 166266, E21B 4322, E21B 4330, E21B 4340
Patent
active
043622127
ABSTRACT:
An enhanced petroleum oil recovery method for increasing the quantity of oil recoverable from an underground deposit thereof is provided which involves injecting into a first point in such deposit a liquid mixture of low molecular weight, light hydrocarbons; alternately reducing and raising the back pressure exerted on said deposit so as to alternately induce boiling and condensation of said light hydrocarbon mixture; recovering from a second point in said deposit under controlled back pressure a mixture of said light hydrocarbons and oil; separating the light hydrocarbons from the extracted petroleum oil by distillation; and then recycling the light hydrocarbons to the injection step. Another aspect of the invention involves utilizing the essential features thereof for the recovery of oil from oil-bearing sands, e.g. tar sands, which are mined and brought to the surface.
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Novosad Stephen J.
Rosen Lawrence
Suchfield George A.
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