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Encapsulated Fluid-Loss Additives for Cement Compositions

  • US 20160017688A1
  • Filed: 07/21/2014
  • Published: 01/21/2016
  • Est. Priority Date: 07/21/2014
  • Status: Abandoned Application
First Claim
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1. A method of cementing comprising:

  • providing a cement composition comprising;

    a hydraulic cement,water, andan encapsulated fluid-loss additive;

    wherein the encapsulated fluid-loss additive comprises a fluid-loss additive in an amount of about 60% to about 99.9% by weight of the encapsulated fluid-loss additive and an encapsulation material in an amount of about 0.1% to about 40% by weight of the encapsulated fluid-loss additive;

    wherein the fluid-loss additive is encapsulated by matrix encapsulation;

    placing the cement composition in a selected location; and

    allowing the cement composition to set;

    wherein the encapsulation material delays release of the fluid-loss additive into the cement composition for a time of about 5 minutes to about 30 minutes.

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