Method of reducing fluid loss in cement compositions containing

Details Method of reducing fluid loss in cement compositions containing Method of reducing fluid loss in cement compositions containing

1985-09-25

1987-02-03

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

106 97, 264 35, C09K 700

Patent

active

046409424

ABSTRACT:
Methods of using salt-tolerant cementing compositions in oil, gas and water well cementing operations including selected fluid loss additives to reduce fluid loss from the composition to the formation are disclosed. Such compositions incorporate certain admixtures of carboxymethylhydroxyethylcellulose or copolymers and copolymer salts of N,N dimethylacrylamide and 2-acrylamido, 2-methyl propane sulfonic acid having mole ratios of between about 1:4 to about 4:1 respectively and a molecular weight such that the Brookfield viscosity reading of a 0.1% aqueous solution of said copolymers at 5 rpm of the U.L. Adapter Spindle is in the range of between about 30 and 250 centipoise together with a copolymer or salt of a copolymer of acrylic acid/AMPS wherein said copolymer has an acrylic acid/AMPS mole ratio of between about 5:1 to about 1:5, and a molecular weight such that the Brookfield viscosity reading of a 10% aqueous solution of said copolymers at 20 rpm of the U.L. Adapter Spindle is in the range of between about 5 and 50 centipoise. Selected concentration levels of the acrylic acid/AMPS copolymer may provide improved fluid-loss control under elevated temperature conditions to cement compositions.

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