11) What are the characteristics of \"reinjection wells\"? 12) What are the char
ID: 121600 • Letter: 1
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11) What are the characteristics of "reinjection wells"? 12) What are the characteristics of "trace tests 13) Why do we use reinjection wells/tests? 14) Define "EGS" and write its characteristics. 15) Cooling of water, scaling and rapid clogging. These three terms 16) Why do we reinject water into the geothermal fields? 17) Based on Kaya et al. (2011), how do you classify the geothermal fields? Please show me their classification? 18) Based on Kaya et al. (20), which geothermal systems produce the most energy in MWe? 19) According to Kaya et al. (2011) which geothermal system receives the most reinjected water? 20) What are purposes of using tracer tests? 21) Why do we use "luorescein" as tracer test material?Explanation / Answer
11) Reinjection distributed in between the production wells, the intermixed configuration . A similar configuration was also used when reinjection wells were alternatively used as producers and injectors (huff and puff), but with the addition of one reinjection well.
Reinjection near the boundaries of the reservoir, the peripheral configuration.
Reinjection in a certain area of the reservoir and production from another distinct area, the dipole configuration
Cooling of production wells, or cold-front breakthrough, often because of “short-circuiting” along direct flow-paths such as open fractures.
Inside the main production reservoir, i.e. in-between production wells.
Often production/reinjection doublets.
Peripheral to the main production reservoir, i.e. on its outskirts but still in direct hydrological connection.
Above the main reservoir, i.e. at shallower levels. Role and management of reinjection 5 Axelsson
Below the main reservoir, i.e. at deeper levels.
Outside the main production field, either in the production depth range or at shallower or deeper levels. In this case direct hydrological connection to the production reservoir may not exist.
Silica scaling in surface pipelines and injection wells in high-temperature geothermal fields. After flashing in a separator/power plant, the separated fluid becomes supersaturated in SiO2 and silica will precipitate from the fluid.
Other types of scaling and corrosion in both low-temperature and high-temperature operations. This includes e.g. carbonate scaling in low-temperature systems.
Rapid clogging of aquifers next to injection wells in sandstone reservoirs by fine sand and precipitation material.
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