Boring or penetrating the earth – Boring with explosion in inaccessible hole – Firing control mechanically actuated in bore
Patent
1983-07-25
1985-01-01
Novosad, Stephen J.
Boring or penetrating the earth
Boring with explosion in inaccessible hole
Firing control mechanically actuated in bore
166297, 102204, 89 115, E21B 4311
Patent
active
044911858
ABSTRACT:
Method and apparatus for completing subsurface formations traversed by a borehole. A perforating gun and a firing head assembly are run into the borehole on the end of a tubing string. A percussion firing assembly subsequently is lowered through the tubing string and latches into the firing head assembly. To initiate the firing system an impact member is dropped through the tubing string. Should ignition fail to occur the percussion firing assembly and a portion of the firing head assembly can be detached and removed from the borehole. An electrical firing assembly can be lowered through the tubing string into engagement with the remaining portion of the firing head assembly and an electrical control signal used to detonate the perforating gun. Should ignition again fail the electrical firing assembly is removed leaving a perforating system having no primary explosives therein, which can be removed from the borehole by pulling the tubing string.
REFERENCES:
patent: 2120615 (1938-06-01), King
patent: 2155322 (1939-04-01), McCullough
patent: 2419371 (1947-04-01), Schlumberger
patent: 2873675 (1959-02-01), Lebourg
patent: 3710717 (1973-01-01), Tamplen
patent: 3800705 (1974-04-01), Tamplen
Bui Thuy M.
Novosad Stephen J.
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