Wells – Pistons – fluid driven into well
Patent
1985-11-25
1987-11-17
Novosad, Stephen J.
Wells
Pistons, fluid driven into well
166202, E21B 3316
Patent
active
047067470
ABSTRACT:
A wellbore plug having a wiper disposed in inverted position which, in one embodiment, reinforces a conventionally disposed wiper of the plug. A plug wiper is provided which has a conventional cone-shaped portion and an opposing reinforcing portion, cone-shaped or otherwise. A plug wiper is provided which has no threads for mating with other parts of the plug, but which has a hollow recess for emplacing the wiper on a plug shaft.
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American Petroleum Institute, "Oil Well Cementing Practices in the United States", p.112 (1959).
Dowell Schlumberger, "Primary Placement Techniques", Chapter 10, pp. 1-20 (1984).
Bagnell David J.
Novosad Stephen J.
Weatherford U.S. Inc.
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