Host-guest lost-circulation materials for sealing lost circulation zones in wellbores

A method of making a host-guest lost circulation material (LCM) composition for sealing lost circulation zones in wellbores, the method comprising:

• adding one or more cyclic molecules to an aqueous solution, the cyclic molecules comprising alpha cyclodextrins, beta cyclodextrins, gamma cyclodextrins, or combinations thereof;
• adding one or more linear polymer chains to the aqueous solution, the linear polymer chains comprising polyethylene glycols (PEG) with molecular weights greater than 2500 g/mol, polypropylene glycols (PPG), polydimethylsiloxanes (PDMS), or combinations thereof;
• and
• agitating the aqueous solution until the aqueous solution is observed to turn opaque, wherein the one or more cyclic molecules form a host-guest structure around the one or more linear polymer chains utilizing van der Waals forces, and wherein the LCM composition does not comprise cement.

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

• injecting a host-guest lost circulation material (LCM) composition into the lost circulation zone, the LCM composition comprising:
• an aqueous solution;
• one or more linear polymer chains, the linear polymer chains comprising polydimethylsiloxanes (PDMS), polypropylene glycols (PPG), polyethylene glycols (PEG) with molecular weights greater than 2500 g/mol, or combinations thereof;
• and
• one or more cyclic molecules comprising alpha, beta, or gamma cyclodextrins;
• and wherein
• the one or more cyclic molecules form a host-guest structure around the one or more linear polymer chains utilizing van der Waals forces;
• and
• allowing the LCM composition to plug the lost circulation zone, thereby preventing wellbore fluids from passing into the lost circulation zone, wherein the LCM composition does not comprise cement.