Other
Scientific paper
Sep 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976georl...3..513p&link_type=abstract
Geophysical Research Letters, vol. 3, Sept. 1976, p. 513-516.
Other
18
Earth Crust, Energy Technology, Geothermal Energy Conversion, Thermohydraulics, Water Flow, Circulation, Crack Propagation, Cross Sections, Earth Hydrosphere, Fracture Mechanics, Heat Exchangers, Pressure Effects, Propagation Velocity
Scientific paper
Energy extraction from dry geothermal reservoirs can rely on large hydraulic fractures at depth at relatively impermeable rock connected by inflow and outflow wells to the earth's surface; energy would be recovered by circulating a fluid through the fracture and a heat exchanger at the surface. The paper assesses the effects of linear gradients, primarily due to fluid flow, which produce a symmetrical loading along horizontal sections through a vertical fracture. In particular, the cross-sectional form of the fracture and conditions for closure and propagation are derived. It is shown that the cross-sectional form and stability of large hydraulic fractures are highly sensitive to symmetric gradients in fluid pressure and regional stress. The features of fracture form and stability are likely to play a key role in the design of hydraulic fractures for geothermal energy production
Pollard David
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