Abstract
Abstract: Enhanced geothermal systems (EGS) are a promising renewable energy technology that uses the heat stored in the Earth’s crust to generate electricity. In EGS, water is injected into a well drilled into a hot rock to create a network of fractures through which water can circulate and pick up heat. The main challenge of EGS is to develop and maintain these fractures to allow the efficient circulation of water. This review paper examines the use of backfilling materials in EGS to improve water circulation and increase energy extraction. Various backfilling materials are discussed, including proppants, particulate materials, and chemical additives. The effects of backfilling on the mechanical and thermal properties of the reservoir rock are also examined. Finally, case studies of EGS projects that have used backfilling materials are reviewed to evaluate their effectiveness
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