Explosive expansion of formation in lifts for forming an in situ

Details Explosive expansion of formation in lifts for forming an in situ Explosive expansion of formation in lifts for forming an in situ

1981-07-09

1984-04-17

Pate, III, William F.

Mining or in situ disintegration of hard material

Tunnel recovery of fluid material

299 13, E21B 4324

Patent

active

044430361

ABSTRACT:
An in situ oil shale retort is formed by excavating a lower level void adjacent the bottom boundary of a retort site in a subterranean formation, leaving a zone of unfragmented formation within side boundaries of the retort overlying the void. At least a portion of the overlying zone is explosively expanded downwardly towards the void in a plurality of lifts. Vertical columnar explosive charges are placed in each lift and detonated in a single round with a time delay between successive lifts sufficient for formation of the first lift to move out of the way and not interfere with initial explosive expansion of formation in the next successive lift. Preferably, the explosive charges in a second lift are detonated after detonation of explosive charges in a first lift with a time delay in the range of from about five to thirty milliseconds per foot of burden distance of the charges in the second lift. When plural lifts above the first lift are explosively expanded, it is preferred that the time delays progressively increase from the bottom up.

REFERENCES:
patent: 3434757 (1969-03-01), Prats
patent: 3466094 (1969-09-01), Haworth et al.
patent: 3661423 (1972-05-01), Garrett
patent: 4043595 (1977-08-01), French
patent: 4146272 (1979-03-01), French
Winzer, et al., "High-Speed Cinematography of Blasting Operations", Aug. 1979, Martin Marietta Laboratories, MML TR-79-36.
Winzer et al., "The Science of Blasting", Nov. 1978, Martin Marietta Laboratories.

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