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Title: Insights into Cold Water Injection Stimulation Effects through Analytical Solutions to Flow and Heat Transport

Wells in traditional hydrothermal reservoirs are used to extract heat and to dispose of cooled water. In the first case, high productivity (the ratio of production flow rate to the pressure differential required to produce that rate) to is preferred in order to maximize power generation, while minimizing the parasitic energy loss of pumping. In the second case, high injectivity (the ratio of injection flow rate to the pressure differential required to produce that rate) is preferred, in order to reduce pumping costs. In order to improve productivity or injectivity, cold water is sometimes injected into the reservoir in an attempt to cool and contract the surrounding rock matrix and thereby induce dilation and/or extension of existing fractures or to generate new fractures. Though the increases in permeability associated with these changes are likely localized, by improving connectivity to more extensive high-permeability fractures they can at least temporarily provide substantially improved productivity or injectivity.
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Conference: 37th GRC Annual Meeting,Las Vegas, NV,09/29/2013,10/02/2013
Research Org:
Idaho National Laboratory (INL)
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Country of Publication:
United States
15 GEOTHERMAL ENERGY cold water injection; injectivity; thermal stimulation