Method of attenuating airblast from detonating explosive in an i

Details Method of attenuating airblast from detonating explosive in an i Method of attenuating airblast from detonating explosive in an i

1979-06-20

1980-12-16

Purser, Ernest R.

Mining or in situ disintegration of hard material

Tunnel recovery of fluid material

102 23, 299 13, E21C 4110

Patent

active

042392853

ABSTRACT:
An in situ oil shale retort is formed in a subterranean formation containing oil shale and including underground workings by excavating a means for access to a retort site in the formation, excavating a void in the retort site at least in part from the means for access, leaving a remaining portion of the unfragmented formation in the retort site adjacent the void, placing explosive in the remaining portion of formation, and detonating the explosive in such unfragmented formation in a single round to explosively expand formation toward the void for forming a fragmented permeable mass of formation particles containing oil shale in an in situ retort. A permeable barrier is provided between the void and the underground workings which provide means for access to such a void. The permeable barrier has a cross-section for gas flow which is substantially smaller than the transverse cross-section of such means for access, and the cross-section of such permeable barrier temporarily confines gas from such explosive expansion and limits flow of such gas to such means for access to attentuate airblast in underground workings. A fragmented permeable mass of formation particles produced during excavation of the void can provide such a permeable barrier.

REFERENCES:
patent: 1842664 (1932-01-01), Elsing
patent: 2704515 (1955-03-01), Barlow
patent: 3917346 (1975-11-01), Janssen
patent: 3980339 (1976-09-01), Heald et al.

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