Reverse cementing system and method

Details Reverse cementing system and method Reverse cementing system and method

1993-12-07

1996-02-27

Dang, Hoang C.

Wells

Processes

Cementing, plugging or consolidating

1662428, 166323, E21B 3314, E21B 3410

Patent

active

054941075

ABSTRACT:
A cementing system where cement slurry is pumped down the annulus between the casing string and the well bore wall and then allowed to harden therein. A cement shoo on the lower end of the casing string prevents upward flow of fluids as the casing string is run, and then is opened and locked open in response to inside pressure. A normally open check valve in the casing string several joints above the cement shoo has flow passages that are closed by balls or ball discs which are suspended in a fluid spacer that is run ahead of the lower end of the column of cement slurry as it descends in the annulus.

REFERENCES:
patent: 2647727 (1953-08-01), Edwards
patent: 2675082 (1954-04-01), Hall
patent: 2919709 (1960-01-01), Schwegman
patent: 3051246 (1962-08-01), Clark, Jr. et al.
patent: 5297634 (1994-03-01), Loughlin

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