Encapsulated lost circulation materials based on shape-memory polymer foam

A method of reducing lost circulation, the method comprising:

• introducing into a subsurface a wellbore fluid comprising an encapsulated lost circulation material having a core comprising a compressed shape-memory polymer foam and a disintegrating agent, the disintegrating agent comprising at least one of the phase change material, or a gas-producing material, and a shell encapsulating the core, wherein the phase transition material has a phase transition temperature between 112.5° F. and 1100° F. and a volumetric expansion of at least 5% during a phase transition relative to a volume of the phase change material before the phase transition;
• heating the disintegrating agent to cause the phase change material to expand, or to cause the gas-producing material to produce a gas, or a combination thereof to break the shell;
• and
• releasing the compressed shape-memory polymer foam from the encapsulated lost circulation material;
• expanding the released shape-memory polymer foam;
• and
• filling a void or fracture of the subsurface with the expanded compressed shape-memory polymer foam to reduce fluid loss.