| 摘要 |
<p>A device for preventing calamities, in particular by drilling for mineral oil and/or natural gas, allowing complete or substantial blocking of the product flow, comprising a sleeve (6), mounted within a jacket (3), surrounding a drill pipe (2) and completely sealed thereon, said jacket comprising an explosive material (7) and an ignition mechanism (8) with remote control. The sleeve may cooperate with or be replaced by a mole, preferably provided with a radial extender-end expandable by explosive material, ignitable with a suitable ignition mechanism, or by compressed inert gas.</p> |
