Cement composition for high temperature wells and methods for pr

Details Cement composition for high temperature wells and methods for pr Cement composition for high temperature wells and methods for pr

1975-10-14

1977-07-26

Garvin, Patrick P.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106315, 427220, 427221, 428404, 428407, C04B 7353

Patent

active

040380939

ABSTRACT:
A cement composition suitable for cementing high temperature wells comprises dry cement grains coated with a tenacious film of a crosslinked hydroxyalkyl cellulose. The film resists high temperature hydrolysis and is effective to retard the setting of the cement in high temperature environments. The method of preparing the composition involves coating the dry cement grains, preferably by a microencapsulation process, with the crosslinked hydroxyalkyl cellulose film. The cement composition is particularly useful in cementing pipe strings in wells.

REFERENCES:
patent: RE23873 (1954-09-01), Ludwig
patent: 2598675 (1952-06-01), Cutforth
patent: 2629667 (1953-02-01), Kaveler
patent: 2673810 (1954-03-01), Ludwig
patent: 2844480 (1958-07-01), Greminger
patent: 2880096 (1959-03-01), Hurley
patent: 3245814 (1966-04-01), Dunlap et al.
patent: 3483007 (1969-12-01), Hook
patent: 3847630 (1974-11-01), Compernass et al.

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