Method of cementing wells with foam-containing cement

Details Method of cementing wells with foam-containing cement Method of cementing wells with foam-containing cement

1980-06-05

1981-11-17

Novosad, Stephen J.

Wells

Processes

With indicating, testing, measuring or locating

166292, 166293, 166362, E21B 3314, E21B 4700

Patent

active

043006337

ABSTRACT:
To cement the annulus around a casing string in a well penetrating an underground formation, a column of cement slurry which is or includes a foam cement slurry is placed in the annulus and allowed to set. The amount of gas contained in the slurry and the set cement is such that the density in the cement slurry column and the cement in the annulus increases with increasing depth.

REFERENCES:
patent: 2236987 (1941-04-01), Bechtold
patent: 2288556 (1942-06-01), Vollmer
patent: 3098754 (1963-07-01), Dixon
patent: 3573941 (1971-04-01), Edwards
patent: 3798186 (1974-03-01), Nakade et al.
patent: 3926257 (1975-12-01), Marrast et al.
patent: 4234344 (1980-11-01), Tinsley et al.
Aldrich et al., "Strength Permeabilities and Porosity of Oilwell Foam Cement", Journal of Engineering for Industry, Aug. 1976, pp. 1103-1106.

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