Abstract
Abstract At the hot dry rock geothermal energy project in Cornwall, England, run by Camborne School of Mines, a number of hydraulic injections have been completed with the aim of creating zones of enhanced permeability. The fluids used in the Phase 2 system, which is located at a depth of more than 2 km in granite, have been water, and high and low viscosity gels. A large volume, low viscosity gel injection, which relies upon controlled shear stimulation appears the most promising in the context of significant horizontal in situ stress anisotropy which applies at the Cornwall site. The injection design has evolved with the aid of microseismic tracking for in situ locations and for the interpretation of stimulation mechanisms. Numerical modelling has been developed for the specific rock conditions encountered. Hydraulic and microseismic results are reasonably consistent with those suggested by the modelling.
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More From: International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts
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