Circulating cementing collar and method

Details Circulating cementing collar and method Circulating cementing collar and method

E - Fixed Constructions

21

B

E21B 33/14 (2006.01) E21B 21/10 (2006.01) E21B 34/10 (2006.01) E21B 34/14 (2006.01) E21B 34/00 (2006.01)

Patent

CA 2414649

An apparatus and method for cementing a casing string in a wellbore. A self-filling tubular cementing collar connected to the lower end of a casing string is provided with one-way flow valving that allows well fluid to enter and self-fill the casing string as it is lowered into the wellbore and automatically prohibits reverse fluid flow from the collar when washing or cementing during forward circulation through the collar. The one-way valving is carried by an axially movable support that can be shifted by a cementing plug moved by pump pressure to permanently seal the entry flow passage after the casing sting is properly positioned in the wellbore.

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