Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent
1979-12-03
1981-08-04
Purser, Ernest R.
Mining or in situ disintegration of hard material
Tunnel recovery of fluid material
102306, 299 13, E21C 4110
Patent
active
042818788
ABSTRACT:
There is provided a method for forming an in situ oil shale retort in a subterranean formation containing oil shale. At least one void is excavated in the formation, leaving zones of unfragmented formation adjacent the void. An array of main blastholes is formed in the zone of unfragmented formation and at least one explosive charge which is shaped for forming a high velocity gas jet is placed into a main blasthole with the axis of the gas jet extending transverse to the blasthole. The shaped charge is detonated for forming an auxiliary blasthole in the unfragmented formation adjacent a side wall of the main blasthole. The auxiliary blasthole extends laterally away from the main blasthole. Explosive is placed into the main blasthole and into the auxiliary blasthole and is detonated for explosively expanding formation towards the free face for forming a fragmented permeable mass of formation particles in the in situ oil shale retort.
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Bureau of Mines Report of Invest. 7397, "Evaluation of Oil-Shale Fracturing Tests Near Rock Springs, Wyo".
Occidental Oil Shale Inc.
Purser Ernest R.
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