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Abstract:
The utilization of the subsurface for storage of energy and matter is increasingly important. Central to any storage operation are wellbores,
not only for exploration, characterization and development of the storage site itself but also for monitoring the storage operation
and the storage complex during and after the injection activities. Smart wellbores, which are equipped with permanent sensors
at or near reservoir depth, are an integral part of such a monitoring system and provide important data for the storage operation
itself but also for monitoring the long-term behaviour of the storage complex. At the GFZ pilot site for the geological storage of CO2 at
Ketzin, over 67 kt of CO2 have been stored successfully in a deep saline aquifer. Here, smart wells that are equipped with i) glass fibre
cables for distributed temperature sensing, ii) electrical heater cables for heating experiments, iii) pressure and temperature sensors
at or near reservoir depth, and iv) permanent electrodes for geoelectric measurements enabled a smooth and safe injection operation
and provided essential data on the subsurface behaviour of the injected CO2.
