Experimental Study of Water Injection into Geothermal Systems |
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Authors: | Kewen Li Huda Nassori Roland N Horne |
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Institution: | (1) Alberta Energy and Utilities Board, 4999-98th Avenue, Edmonton, AB, Canada, T6B 2X3;(2) Hycal Energy Laboratories Ltd, 1338 A-36th Avenue NE, Calgary, AB, Canada, T2E 6T6 |
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Abstract: | Water injection or reinjection in geothermal reservoirs has been proven as a successful engineering technique with many benefits
such as maintaining reservoir pressure and sustaining well productivity. However, many questions related to water injection
into geothermal reservoirs still remain unclear; for example, how the in-situ water saturation changes with reservoir pressure
and temperature, and how the reservoir pressure influences well productivity. In order to answer these questions, we studied
the effects of temperature and pressure on the in-situ water saturation in a core sample using an experimental apparatus developed
in this study. It was found that the in-situ water saturation decreases very sharply near the saturation pressure but not
to the residual water saturation. When the mean pressure in the core sample decreases further, the in-situ water saturation
decreases sharply again to the residual water saturation. Also investigated were the effects of pressure on well productivity
index. We found that well productivity increased with an increase of mean reservoir pressure within a certain range and then
decreased. The well productivity reached the maximum value at a pressure close to the saturation pressure. The results of
this study may be useful to evaluate projects such as the waste water injection scheme at The Geysers. |
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