Wells – Processes – Electric current or electrical wave energy through earth for...
Patent
1974-12-19
1976-03-30
Novosad, Stephen J.
Wells
Processes
Electric current or electrical wave energy through earth for...
166263, 166272, 166303, E21B 4324
Patent
active
039468097
ABSTRACT:
Disclosed herein is a method for recovering oil from a subterranean oil-bearing formation in which adjacent wells are subjected to steam stimulation to create a zone around each well which is initially heated to approximately steam temperature and which has a high water saturation following steam injection and oil production. Subsequently, a fluid having a relatively high electrical conductivity, such as a brine solution, is injected into the heated zone around the wells. Preferably the injected volume of high conductivity fluid is sufficient to displace the steam condensate from the zone and to fill the zone with the high conductivity fluid. The wells are then completed as electrodes and current is passed through the formation to heat the oil which was not heated to any significant amount by the steam. Following one or more cycles of steam stimulation and electrical heating, additional oil is recovered from the formation, preferably by line-drive steam displacement or by pattern steam flooding.
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Eatherton Lewis H.
Exxon Production Research Company
Lawson Gary D.
Novosad Stephen J.
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