Boring or penetrating the earth – Boring with explosion in inaccessible hole – With bore condition firing control – or compensating means
Patent
1992-02-20
1992-11-24
Britts, Ramon S.
Boring or penetrating the earth
Boring with explosion in inaccessible hole
With bore condition firing control, or compensating means
166 551, E21B 43112
Patent
active
051654890
ABSTRACT:
In accordance with illustrative embodiments of the present invention, a hydrostatic pressure-responsive safety sub that prevents firing of an explosive well tool until it has been lowered below a predetermined depth in a fluid-filled well bore includes a body having an upper chamber that houses a detonator and a lower chamber that houses a booster which is attached to a primercord. A passageway between these chambers normally is blocked by an inner portion of a spring-loaded, hydrostatic pressure-responsive piston which is shifted inward against the bias of a combination of springs. When the explosive tool has been lowered to a predetermined depth in the well, a bore in the piston becomes aligned with the passageway between the chambers so that explosive forces generated by explosion of the detonator can reach the booster.
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Britts Ramon S.
Tsay Frank S.
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