Mining or in situ disintegration of hard material – With separation of materials – Separation below surface of earth or water
Patent
1974-04-10
1976-03-02
Purser, Ernest R.
Mining or in situ disintegration of hard material
With separation of materials
Separation below surface of earth or water
166259, 175 95, 299 14, 299 57, E21B 4324, E21C 4110
Patent
active
039414230
ABSTRACT:
Method of and apparatus for extracting oil from oil shale. An excavating unit is driven by supplying steam to a plurality of steam engines mounted in an annulus between stationary outer and inner casings. A hollow center column and apertured screw vane are mounted for rotation in the inner casing and helical screw sections are provided outwardly of the inner casing at both ends of the apparatus for directing material to and from the inner casing. Steam is supplied to the unit for driving the center column and helical screws, with the steam supplied to the center column emanating through openings in the screw vane mounted in the inner casing for separating the oil from the oil shale by pyrolysis. The oil is withdrawn in the form of a vapor product by means of a vacuum applied to the inner casing for separation and condensation at the surface. Following excavation, the unit can be withdrawn to the surface under its own power.
REFERENCES:
patent: 902517 (1908-10-01), Wittich
patent: 2756037 (1956-07-01), Kirkpatrick
patent: 2800316 (1957-07-01), Henderson
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