Newberry EGS Demonstration: Phase 2.2 Report

Cladouhos, Trenton T.¹  Petty, Susan¹  Swyer, Mike W.¹  Nordin, Yini¹  Garrison, Geoff¹  Uddenberg, Matt¹  Grasso, Kyla¹  Stern, Paul²  Sonnenthal, Eric³  Foulger, Gillian⁴  Julian, Bruce⁴ 

[1] AltaRock Energy, Seattle, WA (United States);PLS Environmental, Boulder, CO (United States);Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States);Foulger Consulting, Palo Alto, CA (United States)

关键词: EGS;    enhanced geothermal system;    Newberry;    stimulation;    microseismicity;    hydroshearing;   

DOI  :  10.2172/1214834
RP-ID  :  DOE/EE/2777/3
PID  :  OSTI ID: 1214834

学科分类：再生能源与代替技术

美国|英语

来源: SciTech Connect

【 摘 要 】

The Newberry Volcano EGS Demonstration is a five year field project designed to demonstrate recent technological advances for engineered geothermal systems (EGS) development. Advances in reservoir stimulation, diverter, and monitoring are being tested in a hot (>300 ??C), dry well (NWG 55-29) drilled in 2008. In the fall of 2014, 9,500m3 (2.5 million gallons) of groundwater were injected at a maximum wellhead pressure of 195 bar (2850 psi) over 4 weeks of hydraulic stimulation. Injectivity changes, thermal profiles and seismicity indicate that fracture permeability in well NWG 55-29 was enhanced. The fifteen-station microseismic array (MSA) located 398 seismic events, ranging in magnitude from M 0 to M 2.26. The next step is to drill a production well into the EGS reservoir. Advanced analysis of the microseismic data including hand picking of first arrivals, moment tensors, relative relocations, and velocity model improvements have resulted new higher-quality microseismic catalogs. These catalogs have been combined by relative weighting and gridding of seismic densities, resulting in probability-based maps and cross-sections, which have been used to plan a production well trajectory. The microseismic locations and times were also used to develop a reservoir diffusivity model, which can be used to evaluate stimulation plans such as dual-well stimulation.