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Settable, form-filling loss circulation control compositions comprising in situ foamed non-hydraulic sorel cement systems and method of use

  • US 10,287,481 B1
  • Filed: 09/21/2018
  • Issued: 05/14/2019
  • Est. Priority Date: 01/24/2018
  • Status: Active Grant
First Claim
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1. A method of treating a lost circulation zone, the method comprising:

  • a) forming a foamed cementitious composition comprising;

    magnesium oxide (MgO);

    a salt selected from the group consisting of magnesium chloride (MgCl2), magnesium sulfate (MgSO4), ammonium hydrogen phosphate (NH4H2PO4), and hydrates thereof;

    an oxidizer;

    a nitrogen gas-generating compound; and

    a foam surfactant; and

    b) introducing the foamed cementitious composition into the lost circulation zone.

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