Pumps are used throughout geothermal energy applications. Pumps induce a pressure gradient, causing movement. For example, this can be used to circulate the working fluid within a Rankine cycle (called feed-water or circulation pumps), to produce geofluid up a production well (production pumps), or to pressurize geofluid before reinjection (injection pumps). Circulation and injection pumps tend to be very similar; however, water production pumps are unique because the pump must be located several hundred meters below the surface in the production well to prevent flashing of water.