TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The method further comprises incorporating the device into a string for deployment into the wellbore for performing an operation comprising production of a fluid from a formation surrounding the wellbore, and treating a formation surrounding the wellbore. The core has a melting point below the glass transition temperature. Preferred Components: The heat transfer nanoparticles include a core and a shell, where the core has a melting point below the glass transition temperature of the base shape memory material and the melting point of the shell. The core includes a material including bismuth, a eutectic salt, a polymer, tin, lead, a salt hydrate, an organic-organic material, an organic-inorganic material, an inorganic-inorganic material, a wax, an oil, a fatty acids and a polyglycol. The shell includes a material comprising a metal, carbon, a polymer, silica, grapheme, graphite, a diamond-like carbon, carbon nitride, boron nitride, iron, nickel, cobalt and zinc, a metal oxide, a nitride, carbide and a polymer that is stable at a selected temperature. The core size is 1-40 nm and thickness of the shell is at least 0.05 nm. The selected amount of the heat transfer nanoparticles is 1-20 wt./vol.%.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The device is a packer, a sand screen and/or an inflow control device for controlling flow of a fluid through it. The forming the device comprises: heating the shape conforming memory material to or above the glass transition temperature to expand the shape conforming material to attain an expanded shape; compressing the shape conforming material from the expanded shape to a compressed shape; and reducing the temperature of the compressed shape to a temperature below the melting point of the core. The shape memory material expands to the expanded shape when heated to or above the glass transition temperature and the core melts within the shell at a temperature below the glass transition temperature of the shape memory material to store heat energy. The device is carried by a tubular member of a string for deployment of the device into a wellbore. EXAMPLE - No suitable example given.