Wells – Processes – In situ combustion
Patent
1981-11-30
1985-01-29
Suchfield, George A.
Wells
Processes
In situ combustion
166272, 166302, E21B 43243
Patent
active
044959931
ABSTRACT:
A method for recovering energy raw materials from a subterranean formation whereby a gas or liquid is injected into the borehole and adjacent formation and vented as required to prevent undesirable combustion or reaction with the introduction of a cryogenic liquid containing oxygen. This cryogenic liquid, when introduced, yields unexpected benefits by its tendency to flow downward and horizontally along the bottom barrier of the pay zone, forming pockets, reacting with material in the formation, fracturing the formation, simultaneously in close proximity heating by combustion and cooling by vaporization, and yielding a unique displacement (flood) due to combustion, reaction and volitallization products formed.
There are two preferred embodiments, first introducing the cryogenic liquid containing oxygen into a borehole and after a period of time producing from the same borehole. Second, introducing the liquid into a pattern of injection borehole(s) and forming a mobile from which can be pushed by another injected liquid or gas and producing from another borehole or other boreholes.
REFERENCES:
patent: 3032103 (1962-05-01), Parker
patent: 3064728 (1962-11-01), Gould
patent: 3332482 (1967-07-01), Trantham
patent: 3399722 (1968-09-01), Buxton et al.
patent: 3581821 (1971-06-01), Ross
patent: 3759329 (1973-09-01), Ross
patent: 3822747 (1974-07-01), Maguire, Jr.
patent: 4042026 (1977-08-01), Pusch et al.
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