Final report, Grace Geothermal Corporation, Baltazor Hot Springs, Nevada, Hole No. 45-14
During the period from September 21, 1982 to November 1, 1982 one geothermal test well was drilled within the Baltazor Hot Springs KGRA in northwestern Nevada to a total depth of 2529 feet (Figure 1). Temperature-depth profiles from two temperature surveys run in the open hole are presented in Figure 2. The maximum temperature recorded was 223.77 F at a total survey depth of 2430 feet. Geothermal gradients from selected intervals in the well ranged from 2.25 F/100 ft to 11.00 F/100 ft. Individual temperature-depth plots, gradient plots, and interval gradient plots are provided in Appendix A. Rock types encountered ranged from unconsolidated alluvium to rhyolitic and basaltic flows, tuffs and flow breccias. A lithologic section for the well is provided in a pocket at the back of the report (Figure 3). Thermal conductivity measurements were performed on a total of 26 drill cutting samples that ranged from 2.9 TCU to 5.5 TCU (1 TCU = 1 mcal/cm-sec-deg C) and are presented in Appendix B. Selected heat flow data for the well are provided in Table 1. Well 45-14 was drilled by Southwest Drilling and Exploration, Inc., utilizing a Gardner Denver 2000 rotary drilling machine with a 53 foot mast rated at 100,000 lbs. capacity. Drilling conditions ranged from moderate to difficult with the major problems resulting from the hard and fractured rhyolite sequence in the upper part of the well. Drilling rates below 1750 feet were greatly reduced as a result of decreasing the weight on the bit to keep the vertical deviation within the required 4 degrees. Fluid losses were contained to a minimum below the rhyolite sequence and did not present a major problem. Selected drilling data and a detailed drilling history are provided in Appendix C. Earth Power Production Company completed two test holes in the immediate area in June and July 1979. Boreholes BZ 1500-1 and BZ 1500-2 were drilled to depths of 1543 feet and 1434 feet respectively. Selected temperature-depth plots from these holes are included in Appendix D.
- Research Organization:
- Southwest Drilling and Exploration, Inc., Poway, CA
- OSTI ID:
- 894601
- Report Number(s):
- NV/BAL/GGG-1; TRN: US200703%%51
- Country of Publication:
- United States
- Language:
- English
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