Development of Thermal Fractures in Two Dutch Geothermal Doublets
| Autor: | D. Loeve, E. Peters, J.D. van Wees, J.G. Veldkamp |
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| Rok vydání: | 2015 |
| Předmět: |
Hydrogeology
Water injection (oil production) Geological Survey Netherlands PG - Petroleum Geosciences SGE - Sustainable Geo Energy Water injection Volcanism Mechanics Geo Produced water Earth sciences Productivity index Fracture Analytical approach Oil well flooding Thermal Heat exchanger Geotechnical engineering ELSS - Earth Life and Social Sciences Wells 2015 Energy Geothermal gradient Igneous petrology Geosciences Geology |
| Zdroj: | Scopus-Elsevier 3rd Sustainable Earth Sciences Conference and Exhibition: Use of the Sub-Surface to Serve the Energy Transition, 13 October 2015 through 15 October 2015, 116-120 |
| ISSN: | 2214-4609 |
| Popis: | In the production well of a low-enthalpy geothermal doublet hot water is pumped from reservoirs at about 50-1007deg;C. After passing through a heat exchanger, the cold water is re-injected at about 20-357deg;C in the injection well into the reservoir, which initially has the same temperature as the produced water. Under some circumstances, this may lead to the initiation of thermal fractures around the injection well, an effect known from water injection in oil wells. This will increase the productivity index (PI), thereby also increasing the efficiency and profitability of the doublet. Using a simple analytical approach, we studied whether thermal fractures are theoretically expected under typical reservoir and injection conditions. From data at high temporal resolution of two geothermal doublets were studied over a longer period of injection to check if the development of a thermal fracture is observed The conclusion that can be drawn from the calculations is that cold fractures hardly develop under the assumed conditions. However, the uncertainty on the pressure estimation necessary for the fracture calculation is relatively large. Possible fracture development is very sensitive to value of the minimum horizontal stress and lowering by 10% allows the initiation of fractures in both doublets. |
| Databáze: | OpenAIRE |
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