Subsurface well pressure actuated and fired apparatus

Details Subsurface well pressure actuated and fired apparatus Subsurface well pressure actuated and fired apparatus

1991-05-10

1993-06-01

Bui, Thuy M.

Wells

Processes

Perforating, weakening, bending or separating pipe at an...

175 456, 175297, E21B 431185

Patent

active

052151484

ABSTRACT:
A firing apparatus for use with a tubing-conveyed perforating apparatus is disclosed. Wellbore pressure applies an upward force to a first piston connected by a shearable coupling to a firing piston. At a predetermined pressure the coupling shears, allowing the first piston to move upward. The first piston moves upward until the firing piston is in fluid communication with the pressure. The firing piston is forced downward by the pressure, firing the perforating apparatus.

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