Systems and methods for thermal reach enhancement

A method of extracting heat from a formation, comprising:

• placing a closed loop working fluid conduit in a wellbore having a target location in a formation, wherein the formation is a formation with low or no permeability;
• pumping a high-thermal conductivity slurry into an annular space between a wall of the wellbore and an outer surface of the closed loop working fluid conduit, wherein the closed loop working fluid conduit is thermally coupled to the high-thermal conductivity slurry;
• compacting the high-thermal conductivity slurry to form a compacted high-thermal conductivity composition;
• wherein the compacted high-thermal conductivity composition has a decreased water content in an amount of at least 10 wt. % as compared to the high-thermal conductivity slurry prior to compaction, and/or an increased density in an amount of at least 10 wt. % as compared to the high-thermal conductivity slurry prior to compaction;
• wherein the compacted high-thermal conductivity composition in the annular space contacts a high-thermal k material in the formation;
• wherein the high-thermal k material is disposed in a plurality of fissures in the formation and wherein the fissures extend from the wellbore into the formation;
• and
• transferring heat from the formation via the high-thermal k material in the fissures and the compacted high-thermal conductivity composition to a working fluid in the closed loop working fluid conduit.