Method of sealing the annulus between a toolstring and casing he

Wells – Valves – closures or changeable restrictors

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166 84, 277 31, E21B 2300, E21B 3303

Patent

active

039659879

ABSTRACT:
Method of going into and coming out of a cased borehole with a toolstring of varying outside diameter wherein the annulus formed between the toolstring and the borehole wall near the casing head must be sealed against fluid flow.
The method is carried out by locating a rotatable stripper rubber to the casing head and arranging a second rotatable stripper rubber in spaced superimposed relationship above the first rubber, with the first rubber being larger than the second so as to enable different size tubular goods associated with a drill string to be withdrawn from the borehole, with one of the strippers always sealingly engaging a marginal length of the drill string. Accordingly, the apparatus provides a method of controlling the well pressure during borehole forming operations.
Each of the strippers are removably affixed to a rotating sleeve by a quick disconnect means in the form of a circumferentially extending hinged clamp means.

REFERENCES:
patent: 2222082 (1940-11-01), Leman et al.
patent: 2673615 (1954-03-01), Humason
patent: 3023012 (1962-02-01), Wilde
patent: 3052300 (1962-09-01), Hampton
patent: 3724862 (1973-04-01), Biffle

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