E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/23
E21B 43/24 (2006.01)
Patent
CA 1055839
BE IT KNOWN THAT GORDON B. FRENCH and RICHARD D. RIDLEY of,respectively: Route 8, Box 253, Bakersfield, California, U.S.A., and 2224 First Street, Grand Junction, Colorado 81501, U.S.A., having made an invention entitled: METHOD OF ENHANCING RECOVERY OF OIL FROM PILLARS ADJACENT IN SITU OIL SHALE RETORT the following disclosure contains a correct and full description of the invention and of the best mode known to the inventor(s) of taking advantage of the same. Abstract of the Disclosure An underground in situ oil shale retort contains a bed of fragmented oil shale particles having an appreciable void volume distributed therethrough. Air or other retorting gas passed through this bed of fragmented oil shale supports combustion of some of the carbonaceous material in the oil shale and provides heat for retorting oil therefrom. A number of such retorts may be formed in an area and pillars are left to support the overburden. Pillars forming walls between adjacent retorts also prevent gas leakage. Oil recovery from intact oil shale pillars between retorts is enhanced by fracturing the pillars as well as fragmenting the shale in the retort. The pillars are fractured by detonating explosives in bore holes in the region between the retort and pillars, preferably a fraction of a second after explosive fragmentation of the oil shale in the retort. 1.
279975
French Gordon B.
Ridley Richard D.
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