Wells – Processes – Placing or shifting well part
Patent
1990-03-30
1991-08-06
Novosad, Stephen J.
Wells
Processes
Placing or shifting well part
166156, 166181, 166202, 166387, E21B 2304, E21B 33126, E21B 3314, E21B 3316
Patent
active
050369229
ABSTRACT:
A single wiper is releasably and sealably positioned adjacent the lower end an operating string and locked therewith to prevent premature release from the operating string upon manipulation of the operating string. The sealing relationship between the wiper and the operating string prevents communication of operating string pressure from the operating string to the resilient ribs of the wiper adjacent the position of the wiper on the operating string. When a pump down plug is sealably seated within the bore of the wiper, fluid pressure is confined to act on a piston between the operating string and the wiper to unlock the wiper from the operating string so that it may be released therefrom.
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Hayden Jack W.
Novosad Stephen J.
Texas Iron Works, Inc.
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