Recovery of fluid fuels by in-situ retorting of carbonaceous dep

Details Recovery of fluid fuels by in-situ retorting of carbonaceous dep Recovery of fluid fuels by in-situ retorting of carbonaceous dep

1978-05-23

1979-05-08

Purser, Ernest R.

Mining or in situ disintegration of hard material

Tunnel recovery of fluid material

299 19, E21C 4110

Patent

active

041533003

ABSTRACT:
In-situ retorts of elongated rectangular shape in horizontal cross section are constructed in subsurface carbonaceous deposits in a plurality of parallel rows in each of which the retorts are arranged end-to-end. The rows are separated by unbroken pillars extending upwardly from rock that is not undermined or penetrated by retorts or tunnels. The ceilings of the retorts slope upwardly at an angle of at least 40.degree. with the horizontal to an apex or crown running longitudinally of the retorts to minimize the danger of roof collapse and provide a broadened pillar through which cross drifts opening into the crown of the retort extend for supplying combustion air. The crown of the ceiling is rounded to minimize concentration of the forces imposed by the overburden.

REFERENCES:
patent: 3765722 (1973-10-01), Crumb
patent: 3917347 (1975-11-01), Janssen
patent: 4072350 (1978-02-01), Bartel et al.

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