Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent
1976-12-09
1978-07-18
Purser, Ernest R.
Mining or in situ disintegration of hard material
Tunnel recovery of fluid material
166271, 166272, E21B 4325, E21C 4110
Patent
active
041011724
ABSTRACT:
The present invention provides a method of in situ extraction of bitumen from an oil-sands body which method comprises sinking an access shaft through the oil-sands body, driving an access drift in the rock strata underlying the oil-sands body, delineating a rectangular block of oil-sands in said body by drilling and blasting the oil-sands body to provide substantially vertical planes of fractured oil-sands on all four sides of an enclosed mining room capable of retaining liquids and gases under pressure and comprising solid pillar walls, providing generally upwardly extending bores in said block of oil sands from the access drift in the said body, providing perforated pipes in those portions of the bores in said block, the perforations of said pipes being dimensioned to prevent sand particles from said block passing therethrough, increasing the permeability of the block of oil sands within said room by fracturing said block, flooding the mining room with a hot fluid at a temperature and for a residence time sufficient to raise the temperature of the block by an amount to cause the bitumen to become flowable with said fluid and removing the fluid-bitumen mixture so formed from said block, the passage of said fluid through said bed being via said perforated pipes and separating said bitumen from said fluid.
REFERENCES:
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patent: 1811560 (1931-06-01), Ranney
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patent: 1870869 (1932-08-01), Ranney et al.
patent: 1884858 (1932-10-01), Ranney
patent: 1935643 (1933-11-01), Laughlin
patent: 2481051 (1949-09-01), Uren
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