TY  - JOUR
ID  - epos1683
UR  - http://doi.org/10.1016/j.geothermics.2015.08.003
A1  - Garcia, Julio
A1  - Hartline, Craig
A1  - Walters, Mark
A1  - Wright, Melinda
A1  - Rutqvist, Jonny
A1  - Dobson, Patrick F.
A1  - Jeanne, Pierre
Y1  - 2015/09//
N2  - An Enhanced Geothermal System (EGS) Demonstration Project is currently underway in the Northwest Geysers. The project goal is to demonstrate the feasibility of stimulating a deep high-temperature reservoir (HTR) (up to 400 °C, 750 °F). Two previously abandoned wells, Prati State 31 (PS-31) and Prati 32 (P-32), were reopened and deepened to be used as an injection and production doublet to stimulate the HTR. The deepened portions of both wells have conductive temperature gradients of 10 °F/100 ft (182 °C/km), produce connate native fluids and magmatic gas, and the rocks were isotopically unexchanged by meteoric water. The ambient temperature meteoric water injected into these hot dry rocks has evidently created a permeability volume of several cubic kilometers as determined by seismic monitoring. Preliminary isotopic analyses of the injected and produced water indicate that 50?75% of the steam from the created EGS reservoir is injection-derived.
PB  - Elsevier Science
JF  - Geothermics
VL  - 63
KW  - Enhanced Geothermal Systems; The Geysers; Induced seismicity; Reservoir stimulation; Shear zones
SN  - 0375-6505
TI  - The Northwest Geysers EGS Demonstration Project, California
Part 1: Characterization and reservoir response to injection
SP  - 97
AV  - none
EP  - 119
ER  -