E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/39
E21B 43/24 (2006.01) E21B 36/02 (2006.01) E21B 43/30 (2006.01)
Patent
CA 1228534
ABSTRACT Viscous oil is recovered by a process that increases sweep efficiency and heat and fuel utilization and that reduces well and compression requirements and costs. Initially, fluid pressure communication is created between two horizontal drainhole wells in a manner such that oil is produced during at least a part of the step of creating fluid pressure communication between the wells. Fluid pressure communication may be created by practicing hot aqueous fluid (preferably, steam) huff and puff techniques in one or both of the wells. After fluid pressure communication is created, a combustion supporting gas (probably, air), a fuel (preferably, natural gas) and an aqueous fluid are injected into one of the drain- hole wells. The fuel is burned downhole in a manner such that hot aqueous fluid (preferably, steam) is formed. The hot aqueous fluid and hot products of combustion are passed directly into the formation in horizontal line drive fashion. These hot fluids follow a horizontally wide sweep pattern which increases heat transfer to the inplace on and increases oil drainage into the producing well. The process is especially useful in permafrost areas.
486226
Atlantic Richfield Company
Osler Hoskin & Harcourt Llp
LandOfFree
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