Method of enhancing recovery of oil from pillars adjacent in sit

Details Method of enhancing recovery of oil from pillars adjacent in sit Method of enhancing recovery of oil from pillars adjacent in sit

1975-04-14

1977-05-24

Purser, Ernest R.

Mining or in situ disintegration of hard material

Tunnel recovery of fluid material

299 13, E21C 4110

Patent

active

040251152

ABSTRACT:
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.

REFERENCES:
patent: 3434757 (1969-03-01), Prats
patent: 3448801 (1969-06-01), Closmann et al.
patent: 3578080 (1971-05-01), Closmann
patent: 3593788 (1971-07-01), Parker
patent: 3630278 (1971-12-01), Parker
patent: 3661423 (1972-05-01), Garret
patent: 3674313 (1972-07-01), Knutson
patent: 3677342 (1972-07-01), Silverman
patent: 3777815 (1973-12-01), Boardman et al.
patent: 3917348 (1975-11-01), Janssen

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