06257334 is referenced by 163 patents and cites 23 patents.

A pair of vertically spaced, parallel, co-extensive, horizontal injection and production wells and a laterally spaced, horizontal offset well are provided in a subterranean reservoir containing heavy oil. Fluid communication is established across the span of formation extending between the pair of wells. Steam-assisted gravity drainage (“SAGD”) is then practised by injecting steam through the injection well and producing heated oil and steam condensate through the production well, which is operated under steam trap control. Cyclic steam stimulation is practised at the offset well. The steam chamber developed at the offset well tends to grow toward the steam chamber of the SAGD pair, thereby accelerating development of communication between the SAGD pair and the offset well. This process is continued until fluid communication is established between the injection well and the offset well. The offset well is then converted to producing heated oil and steam condensate under steam trap control as steam continues to be injected through the injection well. The process yields improved oil recovery rates with improved steam consumption.

Title
Steam-assisted gravity drainage heavy oil recovery process
Application Number
9/359582
Publication Number
6257334 (B1)
Application Date
July 22, 1999
Publication Date
July 10, 2001
Inventor
Marcel Polikar
Edmonton
US
Roy Coates
Sherwood Park
US
Ted Cyr
Edmonton
US
Agent
Marsh Fischmann & Breyfogle
US
Assignee
Alberta Oil Sands Technology and Research Authority
US
IPC
E21B 43/24
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