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Title: Technology Development and Field Trials of EGS Drilling Systems at Chocolate Mountain

Polycrystalline diamond compact (PDC) bits are routinely used in the oil and gas industry for drilling medium to hard rock but have not been adopted for geothermal drilling, largely due to past reliability issues and higher purchase costs. The Sandia Geothermal Research Department has recently completed a field demonstration of the applicability of advanced synthetic diamond drill bits for production geothermal drilling. Two commercially-available PDC bits were tested in a geothermal drilling program in the Chocolate Mountains in Southern California. These bits drilled the granitic formations with significantly better Rate of Penetration (ROP) and bit life than the roller cone bit they are compared with. Drilling records and bit performance data along with associated drilling cost savings are presented herein. The drilling trials have demonstrated PDC bit drilling technology has matured for applicability and improvements to geothermal drilling. This will be especially beneficial for development of Enhanced Geothermal Systems whereby resources can be accessed anywhere within the continental US by drilling to deep, hot resources in hard, basement rock formations.
Authors:
Publication Date:
Report Number(s):
140
DOE Contract Number:
AID 20008
Product Type:
Dataset
Research Org(s):
DOE Geothermal Data Repository; Sandia National Laboratories
Collaborations:
Sandia National Laboratories
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Geothermal Technologies Program (EE-2C)
Subject:
15 Geothermal Energy; geothermal; chocolate mountains; drilling; pdc bit; roller cone; granite; chocolate mountains drilling; synthetic diamond; rate of penetration; egs; lateral vibration spectrum; California; CA; Southern California; SoCal; drilling records; performance data; drilling charts; before and after; pictures; vibration spectrum
OSTI Identifier:
1225980

Steven Knudsen. Technology Development and Field Trials of EGS Drilling Systems at Chocolate Mountain. United States: N. p., Web. doi:10.15121/1225980.
Steven Knudsen. Technology Development and Field Trials of EGS Drilling Systems at Chocolate Mountain. United States. doi:10.15121/1225980.
Steven Knudsen. 2012. "Technology Development and Field Trials of EGS Drilling Systems at Chocolate Mountain". United States. doi:10.15121/1225980. https://www.osti.gov/servlets/purl/1225980.
@misc{osti_1225980,
title = {Technology Development and Field Trials of EGS Drilling Systems at Chocolate Mountain},
author = {Steven Knudsen},
abstractNote = {Polycrystalline diamond compact (PDC) bits are routinely used in the oil and gas industry for drilling medium to hard rock but have not been adopted for geothermal drilling, largely due to past reliability issues and higher purchase costs. The Sandia Geothermal Research Department has recently completed a field demonstration of the applicability of advanced synthetic diamond drill bits for production geothermal drilling. Two commercially-available PDC bits were tested in a geothermal drilling program in the Chocolate Mountains in Southern California. These bits drilled the granitic formations with significantly better Rate of Penetration (ROP) and bit life than the roller cone bit they are compared with. Drilling records and bit performance data along with associated drilling cost savings are presented herein. The drilling trials have demonstrated PDC bit drilling technology has matured for applicability and improvements to geothermal drilling. This will be especially beneficial for development of Enhanced Geothermal Systems whereby resources can be accessed anywhere within the continental US by drilling to deep, hot resources in hard, basement rock formations.},
doi = {10.15121/1225980},
year = {2012},
month = {1} }
  1. The Geothermal Data Repository (GDR) is the submission point for all data collected from researchers funded by the U.S. Department of Energy's Geothermal Technologies Office (DOE GTO). The DOE GTO is providing access to its geothermal project information through the GDR. The GDR is powered by OpenEI, an energy information portal sponsored by the U.S. Department of Energy and developed by the National Renewable Energy Laboratory (NREL).
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