Firing Head

Details Firing Head Firing Head

1995-02-21

1996-07-30

Neuder, William P.

Boring or penetrating the earth

Boring with explosion in inaccessible hole

Explosive charge carried by projectile

175 456, 166297, E21B 43116

Patent

active

055402933

ABSTRACT:
An explosive or combustion actuated subsurface well tool includes a firing head for initiating operation of the tool in response to a projectile, such as a ball or go-devil, being pumped down a tubing string extending from the surface. The firing head includes a passage sized to closely receive the ball or go-devil, in either a sealed manner in which substantially no liquid leaks around the pumped projectile or in an unsealed manner in which a small amount of liquid leaks around the projectile. As the projectile moves into the passage, the pressure drop across the projectile becomes quite large creating a large force sufficient to shear a safety pin, drive home a firing pin or otherwise initiating operation of the subsurface well tool.

REFERENCES:
patent: 2067408 (1937-01-01), Morris
patent: 2254979 (1941-09-01), Ricou
patent: 2760408 (1956-08-01), Taylor
patent: 4260017 (1981-04-01), Nelson et al.
patent: 4658900 (1987-04-01), Stout
patent: 4690227 (1987-09-01), George et al.
patent: 4924952 (1990-05-01), Schneider
patent: 5161616 (1992-11-01), Colla

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