Method and apparatus for perforating a well

Details Method and apparatus for perforating a well Method and apparatus for perforating a well

1988-01-25

1990-04-17

Neuder, William P.

Wells

Processes

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

175 454, E21B 43112

Patent

active

049171895

ABSTRACT:
A method and apparatus for perforating a subsurface formation in a pumped well. An assembly is provided which facilitates both the support of a pump in a tool string and the convection of fluid, and pressures, around the pump in the tool string. A firing head associated with the perforating gun is actuated by a pressure of differential between the tubing string bore and the wellbore annulus. This pressure differential is achieved by a downhole pump which pumps fluid out of the wellbore into the tubing string bore.

REFERENCES:
patent: 4484632 (1984-11-01), Vann
patent: 4509604 (1985-04-01), Upchurch
patent: 4523643 (1985-06-01), McGlothen
patent: 4560000 (1985-12-01), Upchurch
patent: 4564076 (1986-01-01), Vann et al.
patent: 4655298 (1987-04-01), George et al.
Phoenix Petroleum Service Ltd.-"The Phoenix TCP/ESP Combination Using the Phoenix By-Pass System", (1988).
R. W. Dudley-"Reperforation of North Sea Electric Submersible Pump Wells Using an ESP/Y-Tool/TCP System", (1987).
Vannsystems Equipment-"Annulus Pressure Firing Head", (1987).
Vannsystems Equipment Firer--"Releasable Annulus Pressure Firer", (1987).

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