Two-part thixotropic lost circulation slurry

A method of reducing lost circulation in a wellbore, the method comprising:

• drilling the wellbore with a drilling fluid;
• providing a pozzolan slurry comprising a pozzolanic material and water;
• providing a calcium slurry comprising a calcium source, a high pH activator, and water;
• allowing the pozzolan slurry and the calcium slurry to remain separate;
• wherein at least one of the pozzolan slurry and the calcium slurry comprise a thixotropic material;
• wherein at least one of the pozzolan slurry and the calcium slurry comprise a dispersant;
• wherein at least one of the pozzolan slurry and the calcium slurry comprise a weighting agent;
• mixing the pozzolan slurry and the calcium slurry to form a two-part thixotropic lost circulation slurry after the allowing the pozzolan slurry and the calcium slurry to remain separate;
• pumping at least one of the pozzolan slurry, the calcium slurry, or the two-part thixotropic lost circulation slurry through a bottom hole assembly disposed within the wellbore;
• introducing the two-part thixotropic lost circulation slurry to a lost circulation zone within the wellbore;
• and
• allowing or causing to allow the two-part thixotropic lost circulation slurry to set into a hardened mass within the lost circulation zone;
• wherein at least a portion of the drilling fluid is circulated past the hardened mass.

A system for reducing lost circulation in a wellbore, the system comprising:

• a pozzolan slurry comprising a pozzolanic material and water;
• a calcium slurry comprising a calcium source, a high pH activator, and water;
• wherein at least one of the pozzolan slurry and the calcium slurry comprise a thixotropic material;
• wherein at least one of the pozzolan slurry and the calcium slurry comprise a dispersant;
• wherein at least one of the pozzolan slurry and the calcium slurry comprise a weighting agent;
• mixing equipment capable of mixing the pozzolan slurry or the calcium slurry;
• and
• pumping equipment capable of pumping the pozzolan slurry or the calcium slurry.