Apparatus and process for fracture conductivity tuning

An apparatus for fracture conductivity tuning comprising:

• at least one injection well;
• fractures communicatively connected to the at least one injection well such that a working fluid injectable via the at least one injection well passes through the fractures to at least one production well;
• and
• thermally expansive elements being positioned in the at least one injection well, the fractures and/or the at least one production well to adjust fracture conductivity of heat to the working fluid, the thermally expansive elements configured to solidify to a solid or enlarge from a first size to a second size to have a greater volume when at a temperature that is below a first pre-selected temperature and the thermally expansive elements are configured to dissolve or be at their first size when at a temperature that is above a second pre-selected temperature, the second pre-selected temperature being greater than the first pre-selected temperature.