Firing head with metered delay

Details Firing head with metered delay Firing head with metered delay

1998-02-17

1999-11-30

Jordan, Charles T.

Ordnance

Well perforators

166297, 166 63, 166 55, B64D 104, E21B 2902, E21B 2900

Patent

active

059922893

ABSTRACT:
A method of delaying detonation of an explosive device within a subterranean well is provided which is convenient, economical and efficient in its use. In addition, the safety of such operations is enhanced by the construction of a firing head used in the method and engaged with the explosive device in the well. In one described embodiment, the firing head includes a piston reciprocably received in a fluid chamber, and an orifice for metering fluid from the chamber. When the firing head is engaged with the explosive device, weight is applied to the piston, thereby forcing fluid from the chamber through the orifice and producing a time delay. After the piston has traveled a predetermined distance relative to the chamber, its further displacement is relatively unrestricted and the weight drives the piston downwardly to cause detonation of the explosive device.

REFERENCES:
patent: 4911251 (1990-03-01), George et al.
patent: 4924952 (1990-05-01), Schneider
patent: 5161616 (1992-11-01), Colla
patent: 5167282 (1992-12-01), Schneider et al.
patent: 5191936 (1993-03-01), Edwards et al.
patent: 5490563 (1996-02-01), Wesson et al.
patent: 5540293 (1996-07-01), Mohaupt

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