Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent
1978-10-12
1981-05-26
Purser, Ernest R.
Mining or in situ disintegration of hard material
Tunnel recovery of fluid material
166259, E21C 4110
Patent
active
042694493
ABSTRACT:
A method for preparing a shale oil deposit for in situ retorting includes providing a drilling and process control level above the deposit with a substantial thickness of personnel isolating and protecting formation between the deposit and the level, providing a collecting and pumping level below the deposit with a substantial thickness of personel isolating and protecting formation between that level and the deposit, and excavation providing voids affording fragmentation of shale in the retorting zones reached from the collecting level. The shale excavated to provide the voids is transported through access risers to the collecting level; closures serving as sumps and protective gratings for the sumps are installed in the upper ends of the risers. Introduction of combustion gases from the control level is accomplished through drill holes provided for this purpose, some of the drill holes also being provided with control or detecting devices. As the combustion and heating of the fragmented shale proceeds, the resulting liquid flows downwardly through the retorts and into the collecting zone. There separating and pumping equipment is provided for the purpose of delivering the separated fluids to the surface. An arrangement of continuous retorts is operated from the control and collecting levels; adjacent retorts are protected by bulkhead doors for emergency isolation of the working areas. The voids in the depleted fragmented shale in the retort are filled with a water slurry of ground depleted shale.
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Edwards Wm. Griffith
Mineral Industries Engineers, Inc.
Purser Ernest R.
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