Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent
1979-02-12
1980-10-28
Purser, Ernest R.
Mining or in situ disintegration of hard material
Tunnel recovery of fluid material
299 13, 299 18, 299 19, 166259, 166280, 166308, 405 55, 405266, E21C 4104, E21C 4112
Patent
active
042303680
ABSTRACT:
A method for elevating extremely large blocks of earth by displacement with a slurry composed of water and locally excavated materials. The blocks are separated on lateral faces by variously drilling, jetting, fracturing, and kerf cutting operations. The blocks are separated at the lower end by notching and hydraulic fracturing. Block movement is started by injecting gelled fluid into the narrow separations.
In one set of applications the high density slurry filling the side clearances is less dense than the block being elevated. In these cases the earth blocks are displaced upward by injecting fluid into the underside, and the non hydrostatic component of the displacement pressure is contained by the gel strength of the slurry filling the narrow side clearance. In a second set of applications the blocks being elevated contain a high percentage of coal, and slurry filling the side clearances exceeds the block density. The blocks are then displaced upward by hydrostatic pressure. The method has a wide range of applications which include elevating a block and cementing it in place to form a storage cavity, elevating a block and fragmenting a hydrocarbon containing section into the resulting cavity in preparation for in situ recovery of hydrocarbons, and elevating a block to recover the coal contained in the block.
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