Well cementing method using low fluid-loss cement slurry

Details Well cementing method using low fluid-loss cement slurry Well cementing method using low fluid-loss cement slurry

1979-01-24

1981-03-31

Novosad, Stephen J.

Wells

Processes

Cementing, plugging or consolidating

106 93, 166283, E21B 3314

Patent

active

042587905

ABSTRACT:
An improved fluid loss additive for use in well cements, preferably comprising from about 30 to about 70 weight percent polyvinylpyrrolidone, from about 5 to about 19 weight percent carboxymethylhydroxyethyl cellulose, and the sodium salt of naphthalene sulfonate. Improved cement slurries comprising the subject fluid loss additive and an improved method for cementing well bores through use of the novel slurries are also provided. The improved cement slurries of the invention preferably comprise from about 26 to about 60 percent water and from about 0.75 to about 2 percent of the improved fluid loss additive, by weight of the cement.

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patent: 3483007 (1969-12-01), Hook
patent: 3614634 (1952-10-01), Lea
patent: 3662830 (1972-05-01), Martin

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