Dispersant and fluid loss additives for oil field cements

Details Dispersant and fluid loss additives for oil field cements Dispersant and fluid loss additives for oil field cements

E - Fixed Constructions

21

B

31/21

E21B 33/13 (2006.01) C04B 24/16 (2006.01) C04B 28/02 (2006.01) C09K 8/46 (2006.01)

Patent

CA 1241827

ABSTRACT OF THE DISCLOSURE Dispersants and fluid loss additives for inclusion in oil field cements and methods of using the resultant com- positions in oil, gas and water well cementing operations are disclosed. Such compositions incorporate a polymeric additive prepared by caustic-catalyzed condensation for for- maldehyde with acetone, or a substance derived from acetone, wherein said polymer includes sodium sulfonate groups in an amount sufficient to render such polymer water soluble. A second fluid loss additive such as hydroxyethyl cellulose, carboxymethylhydroxyethyl cellulose, copolymers of N, N- dimethylacrylamide and 2-acrylamido, 2-methyl propane sulfo- nic acid or copolymers of acrylamide and 2-acrylamido, 2-methyl propane sulfonic acid may optionally be included. 43

480452

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