Abstract

The Hot Dry Rock (HDR) geothermal has huge reserves, clean and environmental protection, and is widely recognized as a renewable energy source with great development potential. Hot Dry Rock contains little or no fluid and is usually developed using Enhanced Geothermal System (EGS) technology. The efficiency of geothermal energy extraction depends on the fracture-making capacity and heat transfer capacity of reservoir and is directly related to the fracture-network structure transformation of reservoir. At present, the reservoir modification mainly includes hydraulic fracturing, chemical stimulation and thermal stimulation. However, how to increase the heat exchange area, increase the heat extraction channel, and stabilize the extraction of geothermal energy are still the challenges of efficient geothermal exploitation.

Keywords: Enhanced geothermal system; HDR; Reservoir stimulation; Hydraulic fracturing

Abbreviations:HDR: Hot Dry Rock; EGS: Enhanced Geothermal System