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Title: Michrohole Arrays Drilled with Advanced Abrasive Slurry Jet Technology to Efficiently Exploit Enhanced Geothermal Systems

This project had two major areas of research for Engineered/ Enhanced Geothermal System (EGS) development - 1) study the potential benefits from using microholes (i.e., bores with diameters less than 10.16 centimeters/ 4 inches) and 2) study FLASH ASJ to drill/ install those microbores between a well and a fracture system. This included the methods and benefits of drilling vertical microholes for exploring the EGS reservoir and for installing multiple (forming an array of) laterals/ directional microholes for creating the in-reservoir heat exchange flow paths. Significant benefit was found in utilizing small microbore sized connecting bores for EGS efficiency and project life. FLASH ASJ was deemed too complicated to optimally work in such deep reservoirs at this time.
 [1] ;  [2] ;  [2] ;  [2] ;  [2] ;  [3] ;  [3] ;  [1] ;  [1]
  1. Impact Technologies, Tulsa, OK (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Univ. of Tulsa, OK (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
FLASH ASJ Drilling Project for Geothermal
DOE Contract Number:
Resource Type:
Technical Report
Research Org:
Impact Technologies, Tulsa, OK (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Geothermal Technologies Office (EE-4G)
Country of Publication:
United States
15 GEOTHERMAL ENERGY geothermal, geothermal energy, EGS, engineered geothermal system, enhanced geothermal system, small bore wells, micro-bore wells