Positive stop collar

Details Positive stop collar Positive stop collar

1991-06-17

1992-11-24

Neuder, William P.

Wells

Packers or plugs

Flow stopping type; e.g., plug

166156, 292318, E21B 3308

Patent

active

051654733

ABSTRACT:
In accordance with an illustrative embodiment of the present invention, a positively operable stop collar for providing a bridge in a well casing that prevents reverse flow of cement slurry includes a tubular body having upper and lower stop rings positioned in upper and lower recesses therein, seal rings between the recesses, and a bevel on the upper stop ring that is engaged by an inclined surface on the drive plate of a displacement plug to expand the upper stop ring and allow the drive plate to pass through the upper stop ring and to be locked in engagement with the seal rings.

REFERENCES:
patent: 3102595 (1963-09-01), Fisher, Jr. et al.
patent: 3975040 (1976-08-01), Van Gompel
patent: 4378838 (1983-04-01), Ogden et al.
patent: 4408383 (1983-10-01), Nottingham et al.
patent: 4588218 (1986-05-01), Guiler et al.
patent: 5056837 (1991-10-01), Fuehrer

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