Casing restriction sub

Details Casing restriction sub Casing restriction sub

1991-04-01

1992-04-21

Britts, Ramon S.

Wells

Processes

With indicating, testing, measuring or locating

166154, 166242, 166318, 166281, 166285, 137553, 137557, E21B 4709, E21B 4704

Patent

active

051058839

ABSTRACT:
In accordance with an illustrative embodiment of the present invention, a restriction sub apparatus for use during well cementing operations includes a tubular body having upper and lower internal recesses, a restriction ring having a shoulder engaged with the upper recess, and depending, inwardly inclined fingers at its lower end, and a back-up rubber ring mounted in the lower recess that yieldably resists expansion of the fingers as the drive plate of a displacement plug passes downward therethrough to provide a positive surface indication in the form of a pressure change that the plug is located at a particular depth.

REFERENCES:
patent: 3638730 (1972-02-01), Smith
patent: 4190111 (1980-02-01), Davis
patent: 4674573 (1987-06-01), Bode
patent: 4907649 (1990-03-01), Bode

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