Metal well screen assembly with plastic end fitting and method o

Details Metal well screen assembly with plastic end fitting and method o Metal well screen assembly with plastic end fitting and method o

1988-01-19

1989-04-11

Novosad, Stephen J.

Wells

Screens

Spiral

156 735, 2104971, 264248, B29C 2708, E21B 4308, F16L 4702

Patent

active

048197220

ABSTRACT:
The invention relates to conventional metal well screens which have a screen wire wrapped about a plurality of internal support rods to define the screen slots, and particularly to a novel plastic end fitting made of a thermoplastic material which is mechanically attached to the well screen by means of a plurality of circumferentially spaced tongues which engage the inside surface of the screen wires and have a portion of their outer surface positioned within the screen slots. Slots formed in the end fitting between the tongue portions contain the support rods. A method of attaching a thermoplastic fitting made of a material such as polypropylene is also disclosed and includes the steps of heating the tongue portions so that a portion of their outer surface is melted and then is forced radially outwardly into the screen slots, and preferably slightly beyond them, by a pressure applying device such as a tapered wedge tooling arrangement. Induction heating of the screen wires can indirectly heat the plastic by conduction. However, the fitting attachment procedure may be speeded up by pre-heating the fitting.

REFERENCES:
patent: 2933428 (1960-04-01), Mueller
patent: 3883162 (1975-05-01), Colburn
patent: 4262744 (1981-04-01), Mitchell et al.
patent: 4365669 (1982-12-01), Wagner et al.
patent: 4428423 (1984-01-01), Koehler et al.

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