Method for forming an in situ oil shale retort with controlled s

Mining or in situ disintegration of hard material – Tunnel recovery of fluid material

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Details

102312, 166259, 299 13, E21B 43247, E21C 4110

Patent

active

044025505

ABSTRACT:
An array of explosive charges is formed in a retort site in a subterranean formation containing oil shale. The explosive charges that are located around the perimeter of the retort site are smaller than the explosive charges located more remote from the perimeter. Formation within the retort site is explosively expanded toward a void formed in the site by detonating the explosive charges. This explosive expansion of formation results in a fragmented permeable mass of formation particles in the retort. Damage to objects near the retort site, which is caused by seismic shock from the detonations, is minimized by using smaller explosive charges around the perimeter than in the center of the retort site.

REFERENCES:
patent: 4333684 (1982-06-01), Ricketts et al.

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