Method of forming a rubblized in-situ retort

Details Method of forming a rubblized in-situ retort Method of forming a rubblized in-situ retort

1978-03-01

1980-03-25

Purser, Ernest R.

Mining or in situ disintegration of hard material

Tunnel recovery of fluid material

299 13, 299 19, E21C 4110

Patent

active

041947886

ABSTRACT:
An in-situ retort is formed in an oil shale deposit by a sublevel caving method in which the starting slot for the sublevel caving is at opposite ends of the retort on adjacent sublevels. Any zones of high permeability that are formed adjacent to the starting slots are limited in vertical extent to the vertical spacing of the sublevels and are spaced from the zones of high permeability in adjacent sublevels by the length of the retort. A source of channeling through the retort that is caused by the usual sublevel caving mining method is thereby eliminated.

REFERENCES:
patent: 3001776 (1961-09-01), Van Poollen
patent: 4017119 (1977-04-01), Lewis
patent: 4106814 (1978-08-01), French
"SME Mining Engineering Handbook", 12.15--Sublevel Caving, pp. 12-222 to 12-233.

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