Accelerated cement compositions and methods for treating lost circulation zones

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

• contacting an accelerant composition comprising triethanolamine with a cement composition in the lost circulation zone, the cement composition comprising at least:
• from 1 weight percent (wt. %) to 90 wt. % cement precursor based on the total weight of the cement composition;
• and
• from 5 wt. % to 70 wt. % water based on the total weight of the cement composition;
• where a weight ratio of triethanolamine to the cement precursor is from 0.1 percent (%) to 60%;
• and
• curing the cement composition in the lost circulation zone to form a cured cement, where the triethanolamine accelerates the curing rate of the cement composition and the cured cement seals the lost circulation zone,
• in which the cement precursor is API Class G cement.