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Compositions and methods for well completions

  • US 8,689,871 B2
  • Filed: 10/14/2011
  • Issued: 04/08/2014
  • Est. Priority Date: 11/08/2010
  • Status: Active Grant
First Claim
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1. A method for cementing a subterranean well, comprising:

  • (i) preparing a well-cementing composition comprising water, an inorganic cement and an additive comprising particles comprising a gas-generating substance that is encapsulated by coating comprising a polymer, wherein the gas-generating substance comprises one or more materials that release hydrogen, nitrogen or both; and

    (ii) placing the composition in the well,wherein the additive particle size is between about 2 μ

    m and 2000 μ

    m.

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