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Composition for well cementing comprising a compounded elastomer swelling additive

  • US 9,382,159 B2
  • Filed: 04/11/2011
  • Issued: 07/05/2016
  • Est. Priority Date: 04/20/2010
  • Status: Active Grant
First Claim
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1. A composition for well cementing in a subterranean formation comprising a pumpable slurry of an inorganic settable material, water and at least one additive that swells in contact with a fluid that contains CO2, wherein said additive is an elastomer compounded with an aqueous inverse emulsion of particles of a polymer comprising a betaine group,wherein the settable material comprises portland cement, microcement, geopolymer, mixtures of cement and geopolymer, plaster, phosphomagnesium cement or chemically bonded phosphate ceramics or combinations thereof.

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