Tracer dye transport from a well fitted with a downhole heat exchanger, Klamath Falls, Oregon
Low or medium temperature geothermal resources are often used for space and domestic hot water heating. If the resource is located at reasonably shallow depths and adjacent to a major population centre large amounts of relatively cheap, clean heat can be provided. Geothermal fluid is often brought to the surface, either under natural artesian pressure or by pumping, to be used in surface heat exchangers (SHEs). This method generally requires a second well for disposal of the cooled fluid and a substantial capital outlay for pumps and heat exchangers. Large amounts of heat can be extracted from just one or two wells using surface heat exchangers and the method can prove very cost effective in areas with a high density of energy intensive users. For smaller heat loads surface heat exchangers can become expensive and in many instances a downhole heat exchanger (DHE) installed directly in the well bore is capable of supplying cheap heat to a smaller number of users. This report first describes the methods used to carry out the series of dye tests, from well selection to injection of the dye samples. It then discusses the results of these tests in terms of how much dye was recovered, where it was recovered from and how long it took to arrive. The results of the concurrent temperature monitoring work and DHE heat output performance are also presented. Some recommendations are made for any future testing. 13 refs., 42 figs.
- Research Organization:
- Oregon Inst. of Tech., Klamath Falls, OR (USA)
- Sponsoring Organization:
- DOE/CE
- DOE Contract Number:
- FG07-87ID12693
- OSTI ID:
- 6956141
- Report Number(s):
- DOE/ID/12693-6; ON: DE90012156
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
47 OTHER INSTRUMENTATION
DISTRICT HEATING
PERFORMANCE TESTING
DYES
TRACER TECHNIQUES
GEOTHERMAL WELLS
RESOURCE DEVELOPMENT
HEAT EXCHANGERS
IMPLEMENTATION
OREGON
MAPPING
PUMPS
COMPARATIVE EVALUATIONS
COMPILED DATA
FLUID FLOW
HEAT TRANSFER
INTERACTIONS
PLANNING
PROGRESS REPORT
RECOMMENDATIONS
TEMPERATURE MONITORING
WELL DRILLING
WELL LOGGING
DATA
DOCUMENT TYPES
DRILLING
ENERGY TRANSFER
FEDERAL REGION X
HEATING
INFORMATION
ISOTOPE APPLICATIONS
MONITORING
NORTH AMERICA
NUMERICAL DATA
TESTING
USA
WELLS
Geothermal Legacy
150303* - Geothermal Exploration & Exploration Technology- Exploratory Drilling & Well Logging
320106 - Energy Conservation
Consumption
& Utilization- Building Equipment- (1987-)
440400 - Well Logging Instrumentation