Some theoretical and field aspects of reinjection in geothermal reservoirs

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Abstract
Theoretical and field aspects of reinjection into geothermal reservoirs is discussed using examples from various geothermal fields. Reinjection effects can be observed in terms of pressure maintenance, changes in chemical concentrations, and temperature decline. Pressure support due to injection is observed in many liquid‐dominated fields, and in two‐phase field pressure, effects are often felt through mobility changes. In most geothermal fields where injection is employed, changes in chemical concentrations of the produced fluids have been observed, due to the higher salinity of the injected fluids. In some cases the returns of the injected fluids observed through chemical changes have resulted in temperature declines at the producing wells. In those cases the fluid flow is probably concentrated through a few fractures or faults with insufficient surface area for heat exchange with the host rock.

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