Wells – Packers or plugs – Cup type
Patent
1978-07-19
1980-02-26
Pate, III, William F.
Wells
Packers or plugs
Cup type
92254, 417555A, E21B 3700
Patent
active
041901088
ABSTRACT:
This patent application discloses a swab mandrel having thereon a swab with reinforcing wires imbedded at approximately the mid-point of the wall of the swab for a substantial distance to permit the swab to have fluid film lubrication with the tubing in which the wires at the upper end of the swab are approximately at the outer diameter of the swab and are sled shaped to bridge couplings in a tubing. The swab further has a restraining ring around the lower end thereof which supports the body of resilient material and restrains outward movement but is spaced from the wires to permit the wires to move radially outward a limited distance. To insure that a proper support is provided for the swab both above and below a special two piece support is provided for engagement with the bottom of the swab and with the top of the reinforcing wires.
REFERENCES:
patent: 2456551 (1948-12-01), Wilson
patent: 2723721 (1955-11-01), Corsette
patent: 2887347 (1959-05-01), Losey
patent: 2965422 (1960-12-01), Wilson
patent: 3677143 (1972-07-01), Crickner
patent: 4099451 (1978-07-01), Blackwell
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