E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/23
E21B 43/24 (2006.01)
Patent
CA 1055840
BE IT KNOWN THAT DONALD E. GARRETT of 505 W. 9th Street, Claremont, California 91711, U.S.A., having made an invention entitled: FRACTURING OF PILLARS FOR ENHANCING RECOVERY OF OIL FROM 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, having predetermined boundaries, contains a bed of fragmented oil shale particles having an appreciable void volume distributed therethrough. Air 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 is enhanced by fracturing the pillars as well as fragmenting the shale in the retort. The pillars are fractured by hydraulic fracturing, or the like. The fractures are propagated from access holes in the vicinity of the pillars, typically between similar holes adjacent the next retort volume when the pillars are between retorts. 1.
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