04573530 is referenced by 229 patents and cites 6 patents.

A subterranean, viscous oil-containing formation, e.g. tar sands, which has previously been exploited by an in-situ combustion operation to recover the maximum amount of oil therefrom and leaving a solid coke like residue in the formation, is first saturated with a combustible gas such as methane, ethane, propane, natural gas or mixtures thereof, thereafter reinitiating in-situ combustion and then injecting a mixture of an oxygen-containing gas and steam to convert the coke like residue to a combustible product gas consisting predominantly of carbon monoxide and hydrogen within the formation. The combustible product gas is recovered and may be utilized directly as a fuel gas, or may be utilized as feed stock for petro chemical manufacturing processes.

Title
In-situ gasification of tar sands utilizing a combustible gas
Application Number
6/549140
Publication Number
4573530
Application Date
November 7, 1983
Publication Date
March 4, 1986
Inventor
Robert D Offenhauer
Bradenton
FL, US
Costandi A Audeh
Princeton
NJ, US
Agent
Charles A Malone
Michael G Gilman
Alexander J McKillop
Assignee
Mobil Oil Corporation
NY, US
IPC
C10J 5/00
E21B 43/243
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