The Geysers Unit 15 and Adjacent Area
Well and Field Records
Steam flow from one of the first wells (circa 1967). For more photographs, click here.
GEO Operator Corporation (formerly Thermogenics, Inc. and Geothermal Resources International Operator Corporation) drilled steam production and injection wells in the northwestern portion of The Geysers geothermal field from 1967 to1985. These wells produced steam that was sold to PG&E’s power plant 15. In 1989, the plant stopped operating so the wells stopped producing and GEO Operator Corporation went bankrupt.
In 1997-1998, the U.S. Environmental Protection Agency and the Division of Oil, Gas, and Geothermal Resources, with funding from the California Energy Commission, plugged and abandoned most of these idle wells because of severe wellhead corrosion.
Technical data and well cuttings were salvaged from an abandoned warehouse on the GEO Operator Corporation lease. These data have recently been scanned and added to the Division’s existing scanned well records.
The data are unique because GEO Operator Corporation performed an unusually high number of studies, well tests, and analyses. A total of over 10,300 pages and over 340 logs are included in the scans. The reservoir engineering section alone contains over 3,300 pages of reservoir characterization, well testing, and related studies. These data will be useful to the operators at The Geysers Geothermal field, as well as the public and researchers worldwide.
You can access individual well information by clicking on the well API number below.
Other technical data and highly specialized studies and reports that concern multiple wells are cross-referenced in the categories below.
TIF versions of the continuous logs are in the individual well folders. TIF versions of many of the other PDF documents are in a special folder (click here to access). For tips on downloading free TIF viewers and printing well records, click here.
Acrobat Reader may be downloaded for free as well.
The well cuttings have been preserved at the University of Utah’s Energy and Geoscience Institute. For access to the cuttings, please contact Joe Moore at jmoore@egi.utah.edu or 801-585-3540.
Legal Disclaimer
The Technical Data has not been independently reviewed, analyzed or confirmed in any manner. The Department of Conservation, State of California, therefore cannot and does not make any warranty of any kind, express or implied, nor does it assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any of the Technical Data or associated information. The user of the information must therefore assume all responsibility for ensuring the accuracy, usefulness or reliability of the Technical Data and any associated information. This includes reliance upon the Technical Data for engineering, legal, or other site-specific uses, including but not limited to exploration or production activities. Distribution of the Technical Data is intended for informational purposes only and should not be considered authoritative. For more information please refer to the “Conditions of Use” policy.