Method for loading explosive laterally from a borehole

Details Method for loading explosive laterally from a borehole Method for loading explosive laterally from a borehole

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.

REFERENCES:
patent: 2988143 (1961-06-01), Scotty
patent: 3011551 (1961-12-01), Young et al.
patent: 3630283 (1971-12-01), Knutson et al.
patent: 3637020 (1972-01-01), McLamore
patent: 3677342 (1969-12-01), Silverman
patent: 3822916 (1972-11-01), Jacoby
patent: 4018293 (1977-04-01), Keller
patent: 4175490 (1979-11-01), Britton et al.
"Blasters Handbook", Fifteenth Edition, 1969, DuPont Manual, pp. 222-225.
Bureau of Mines Report of Invest. 7397, "Evaluation of Oil-Shale Fracturing Tests Near Rock Springs, Wyo".

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