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CRADA 2007-083 (DOE-RMOTC-61022) Ormat: Low-Temperature Geothermal Power Generation Lyle A. Johnson & Everett D. Walker, RMOTC DISCLAIMER: This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, nor any of their contractors, subcontractors or their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or any third party’s use or the results of such use of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof or its contractors or subcontractors. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. ABSTRACT In many oil fields, a large volume of water is pro- duced with the oil. In a majority of the fields, water is a waste stream and has a temperature below 220 °F. Because of the large volume, this water may still be hot enough to be capable of generating significant electrical power for facility consumption. To verify this concept, the U.S. Department of Energy’s (DOE) Rocky Moun- tain Oilfield Testing Center (RMOTC) has developed a program to test low-temperature power generation from oilfield waste streams. The program started with a Cooperative Research and Development Agreement (CRADA) between Ormat Nevada, Inc. and the DOE. The test unit was an air-cooled, factory integrated, skid-mounted standard design 250 kW Ormat Organic Rankine Cycle (ORC) power plant. This unit was in- stalled at the Naval Petroleum Reserve No. 3 (also known as Teapot Dome Oil Field) north of Casper, Wyoming. The ORC power unit was designed to use 40,000 bpd of 170 °F produced water from the field’s Tensleep for- mation to vaporize the working fluid, isopentane. The projected gross power from the unit was 180 kW (net of 132 kW). Because of the lack of sufficient cooling wa- ter for the system, an air-cooled unit was designed. The unit was put into service in September 2008 and oper- ated until February 2009 when the unit was shut down because of operational problems. During this period, the unit produced 586 MWhr of power. The operation- al problems, caused by operating in excess of the unit capacity, resulted in changes in the control system and repairs to the generator/turbine system. The unit was briefly tested following maintenance and repair but was shut down because of field and well issues. The unit was restarted in September 2009. Between September 2009 and the end of February 2010, the unit produced 478 MWhr of power at a more consistent rate than be- fore the extended shut down. This document may contain protected Cooperative Research and Development Agreement (CRADA) information and is not to be further disclosed for a period of 5 years from the date it was produced except as expressly provided for in the CRADA.PDF Image | Ormat: Low-Temperature Geothermal Power Generation
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