3847219 is referenced by 21 patents and cites 11 patents.

In a tar sand formation in which a relatively water-impermeable zone overlies a water-permeable zone, tar is recovered by injecting steam into the permeable zone to establish a hot, water-permeable channel between at least one production and at least one injection well, said channel preferably having a tar mobility of at least 15 md/cp; continuing steam injection at a rate sufficient to maintain mobility of the tar in the channel at 15 md/cp and increase the tar mobility in the bulk of the formation to about 15 md/cp, preferably while at about the same time restricting production of fluids from the production well; decreasing the pressure in the formation by increasing production from the production well; and recovering the bitumen from the fluids produced.

Title
Producing oil from tar sand
Application Number
05/402,930
Publication Number
3847219
Application Date
October 3, 1973
Publication Date
November 12, 1974
Inventor
Campbell Don A
Prats Michael
Wang Kuo H
Agent
Marlowe Fredrik
Assignee
Shell Explorer
Shell Canada
IPC
E21b 43/24
E21b 43/00
E21B 43/24
E21B 43/16
E21B 43/18
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