Well tubing drain

Details Well tubing drain Well tubing drain

1975-07-30

1976-09-21

Leppink, James A.

Wells

Screens

Porous material

137 70, E21B 3316, E21B 33134

Patent

active

039813606

ABSTRACT:
A well tubing drain including a ported mandrel interposed in the tubing string of a pumping well, and a sleeve initially covering and sealing the mandrel ports, the sleeve being subject to a predetermined internal fluid pressure applied through the ports to shear a retainer pin and cause motion of the sleeve to open the ports.

REFERENCES:
patent: 1793780 (1931-02-01), Daniel
patent: 2647727 (1953-08-01), Edwards
patent: 3193016 (1965-07-01), Knox
patent: 3750752 (1973-08-01), Mott
patent: 3789926 (1974-02-01), Henley et al.
patent: 3878889 (1975-04-01), Seabourn

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