METHYLHYDROXYETHYL CELLULOSE AS CEMENT ADDITIVE FOR USE AT ELEVATED TEMPERATURES

摘要

Disclosed is an aqueous cementing slurry composition and a method of use thereof for cementing a pipe or casing in a borehole of a well using an aqueous cementing slurry composition comprising (a) a hydraulic cement, (b) a methylhydroxyethyl cellulose (HEMC) having an ethylene oxide molar substitution (EO MS) of from 0.16 to 0.22 and a methyl degree of substitution (M DS) of from 1.35 to 1.45, (c) water, and optionally (d) one or more other additives conventionally added to aqueous cementing compositions useful in cementing casings in the borehole of wells. Preferably, the aqueous cementing slurry composition is pumped downwardly into said casing, pumped upwardly into the annulus surrounding said casing until said aqueous composition fills that portion of the annular space desired to be sealed, and then maintaining said aqueous cementing composition in place until the cement sets.