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Recently, it was reported a novel method of deep geothermal energy exploitation by using the super-long gravity heat pipe (SLGHP) in a single-well geothermal system. However, the low heat transfer rate from the geothermal formation outside the heat pipe is one main factor limiting the heat extraction rate of the SLGHP system. In this respect, the concept of a novel enhanced super-long heat pipe system (ESLHPS) is proposed, which encompasses a super-long gravity heat pipe and a heat transfer enhanced region. The heat transfer enhanced region, built around the evaporation section of the heat pipe, features near-well fracture reservoir filled with high thermal conductivity phase change composite. The phase change composite remains as a semiliquid mixture during operation, eliminating the thermal contact resistance between the heat pipe and the reservoir. To evaluate the thermal performance of the …