Injection

Hot water and steam gathering systems are the network of pipelines connecting the power plant with production and injection wells. The size and cost of a steam gathering system can be influenced by some or all of the following: site topography, slope stability, size and spread of the steam field, and temperature and pressure of the resource. Production wells bring the geothermal water to the surface to be used for power generation, while injection wells return the geothermal water and steam condensate back into the geothermal system to be used again. In order to maintain a geothermal system and ensure the continued availability of a resource, geothermal liquids must be injected back into the system. Benefits of injection include enhanced recovery and safe disposal of geothermal fluids, reduced possibility of subsidence, and an increased operational lifetime of the reservoir. When geothermal water is injected, it runs through pipes and cools to a typical injection temperature of 180°F (82°C). If the cooled geothermal liquid is injected too close to a production well, the resource may cool. If, however, the water is injected too far from the geothermal reservoir, it will not sufficiently replenish the system and reservoir pressure may decline.

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