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Investigation on fracture creation in hot dry rock geotherma
Autors：Zhou Zhou a, Yan Jin. et al.
Abstract: The abundant geothermal energy in hot dry rock (HDR) formations is an attractive renewable energy resource with great potential. China will develop its ﬁrst HDR geothermal formation in the Gonghe Basin. HDR is a hard and low-permeability granite containing very few ﬂuids. Development requires ﬂuids to cyclically ﬂow between injection and production wells to extract geothermal energy in the artiﬁcial heat transfer zone. Hydraulic fracturing is the main technology for creating ﬂow paths. But few studies have investigated fractures in HDR geothermal formations. This paper investigated fractures as ﬂow paths in HDR geothermal formations during hydraulic fracturing. Hydraulic fractures were simulated using a custom true-triaxial hydraulic fracturing test system in a realistic formation environment, in which a scaled wellbore was used that was built in outcrop granite rock from the Gonghe Basin. Fracture creation in granite was investigated via experiments, as well as inﬂuence factors, and what experience could be achieved. This study can be used to design and evaluate hydraulic fracturing projects in potential HDR geothermal formations.
source： Elsevier Ltd,2020,153.SCI
The interaction between artiﬁcial and natural fractures. (a) Artiﬁcial fractures propagating along natural fractures; (b) hydraulic fractures propagating across natural fractures.