Design details for an advanced geothermal deep-drilling system
- Pajarito Enterprises, Los Alamos, NM (United States)
- JMC Geothermal Div., Tokyo (Japan)
- Dept. of Energy, Las Vegas, NV (United States)
This is a progress report on a purpose-developed advanced geothermal deep-drilling system. Previous work has defined and reviewed a drilling system concept that provides the needed enhancement in performance with longer bit life and increased rate of penetration. The major drilling and related problems primarily associated with lost circulation are addressed by a dual-wall drillstring and reverse circulation. The high-temperature problems inherent in all successful geothermal drilling projects are also considered in the design of the system. The design details of several sub-components have subsequently been defined: air (nitrogen) and hydraulic (mud) percussion hammers, downhole indexing (rotation) of the percussion tools, steerable bottom hole assemblies (BHA), and initial, approximate pipe sizes for the two drillstring options being considered. Some structural and fluid flow analyses have been conducted. Review of these sub-components have been carried out. A recently developed, unique nitrogen supply unit has been selected to provide minimum corrosion of downhole equipment at the very high temperatures encountered in geothermal drilling.
- OSTI ID:
- 287850
- Report Number(s):
- CONF-960154--; ISBN 0-9648731-8-4
- Country of Publication:
- United States
- Language:
- English
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