发明名称 |
Borehole stemming with a column of liquefiable and/or vaporizable chunks of solid material |
摘要 |
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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申请公布号 |
US4586438(A) |
申请公布日期 |
1986.05.06 |
申请号 |
US19840652268 |
申请日期 |
1984.09.20 |
申请人 |
E. I. DU PONT DE NEMOURS AND COMPANY |
发明人 |
COURSEN, DAVID L.;HEFFNER, JAMES D. |
分类号 |
F42D1/24;(IPC1-7):F42B3/00 |
主分类号 |
F42D1/24 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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