Dispersant and fluid loss additives for oil field cements
AssigneeHalliburton Company
InventorsCharles George, Richard R. Gerke
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Abstract
Dispersants and fluid loss additives for inclusion in oil field cements and methods of using the resultant compositions in oil, gas and water well cementing operations are disclosed. Such compositions incorporate a polymeric additive prepared by caustic-catalyzed condensation for formaldehyde 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 sulfonic acid or copolymers of acrylamide and 2-acrylamido, 2-methyl propane sulfonic acid may optionally be included.
Claims19
A cementing composition useful in cementing oil, gas and water wells comprising:
- water;
- hydraulic cement;
- and,
- a water-soluble additive consisting essentially of a polymer prepared by caustic-catalyzed condensation of formaldehyde with acetone or a substance derived from acetone, wherein said polymer contains sodium sulfonate groups.
A method of cementing a conduit in a borehole penetrating an earthen formation by introducing a cementing composition into the space between said conduit and said formation, wherein said cementing composition comprises water;
- hydraulic cement;
- and a water-soluble additive consisting essentially of a polymer prepared by caustic-catalyzed condensation of formaldehyde with acetone or a substance derived from acetone, wherein said polymer contains sodium sulfonate groups.
A dispersing fluid loss agent useful in cements for use in oil, gas, and water wells comprising a water-soluble first polymer prepared by caustic-catalyzed condensation of formaldehyde with acetone or a substance derived from acetone wherein said polymer contains sodium sulfonate groups and a second fluid loss component selected from the group consisting of hydroxyethyl cellulose, carboxymethylhydroxyethyl cellulose, copolymers of N,N-dimethylacrylamide and 2-acrylamdio, 2-methyl propane sulfonic acid and copolymers of 2-acrylamide, 2-methyl propane sulfonic acid and acrylamide.
Dependencies are inferred from the claim text.