Borehole stemming with a column of liquefiable and/or...

Details Borehole stemming with a column of liquefiable and/or... Borehole stemming with a column of liquefiable and/or...

F - Mech Eng,Light,Heat,Weapons

42

D

102/10, 166/23

F42D 1/00 (2006.01) F42D 1/24 (2006.01)

Patent

CA 1240554

TITLE Borehole Stemming with a Column of Liquefiable and/or Vaporizable Chunks of Solid Material ABSTRACT OF THE DISCLOSURE To prevent the rapid escape of high-pressure explosion gases when an explosive charge is initiated in a borehole, the hole is stemmed with chunks of readily liquefiable and/or vaporizable solid material, preferably chunks of ice and/or chunks of dry ice, piled up one upon the other so as to form a columnar bed of pre-so1idified stemming material. The column remains in place during the explosion, and thereafter disappears by melting and/or subliming on absorbing heat from the surrounding formation. A preferred stemming column comprises a combination of ice chunks and chunks of dry ice, e.g., wherein the ratio of dry ice to ice in the column decreases with distance from the explosive charge.

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