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Settable, form-filling loss circulation control compositions comprising in situ foamed calcium aluminate cement systems and methods of using them

  • US 10,400,154 B2
  • Filed: 01/24/2019
  • Issued: 09/03/2019
  • Est. Priority Date: 01/24/2018
  • Status: Active Grant
First Claim
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1. A cementitious composition comprising:

  • calcium aluminate comprising greater than or about 68.5% alumina and less than or about 31% calcium oxide;

    a nitrogen gas-generating compound in an amount of about 1% to about 10% by weight of the calcium aluminate, the nitrogen gas-generating compound comprising an azo compound;

    an amine activator to accelerate generation of gas from the nitrogen gas-generating compound, the amine activator comprising an ethyleneamine, wherein a weight ratio of the azo compound to the amine activator is about 5;

    1 to about 1;

    5; and

    a foam surfactant.

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