Borehole stemming with a column of liquefiable and/or vaporizable chunks of solid material
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United States of America Patent
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-
May 6, 1986
Issued Date -
N/A
app pub date -
Sep 20, 1984
filing date -
Nov 14, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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-solidified 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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