Downhole ultraviolet system for mitigating lost circulation

A method for sealing a lost circulation zone of a subterranean well, the method including:

• extending a drill string into the subterranean well, the drill string having an ultraviolet system, an actuator, and a fluid flow path;
• instructing the actuator to transmit an on signal to the ultraviolet system to switch the ultraviolet system to an on condition, where in the on condition the ultraviolet system generates ultraviolet light directed towards the fluid flow path of the drill string, where instructing the actuator to transmit the on signal to the ultraviolet system to switch the ultraviolet system to the on condition includes rotating the drill string in a predetermined on signal pattern;
• delivering a loss circulation material into the fluid flow path of the drill string, the loss circulation material having an oligomer, a monomer, and a photo-initiator;
• exposing the loss circulation material to the ultraviolet light to activate the loss circulation material;
• and
• delivering the loss circulation material to the lost circulation zone.