Wells – Processes – In situ combustion
Patent
1974-06-24
1977-08-16
Purser, Ernest R.
Wells
Processes
In situ combustion
166261, E21B 4324
Patent
active
040420272
ABSTRACT:
Petroleum materials may be effectively recovered from subterranean, viscous, asphaltic or bituminous formations such as tar sand deposits by first injecting into the tar sand formation a paraffinic hydrocarbon at a temperature below 300.degree. F which precipitates asphaltic material from the asphaltic petroleum in the formation. Next, solvent injection is terminated and air is injected into the formation, and the formation is ignited to accomplish in situ combustion within the tar sand reservoir utilizing the precipitated asphaltic materials for fuel for the in situ combustion reaction. Reaction temperatures higher than normal in situ combustion temperatures are produced, facilitating thermal cracking and in situ hydrogenation to up grade the produced crude within the tar sand reservoir.
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Allen Joseph C.
Woodward Charles D.
Park Jack H.
Purser Ernest R.
Ries Carl G.
Texaco Inc.
Whaley Thomas H.
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