Datensatz

Zusammenfassung

Geothermal energy can play a major role within the future energy supply. For a safe and sustainable provision of geothermal energy, the structural wellbore integrity is an important issue. In order to monitor processes affecting the wellbore integrity, a fibre optic cable has been permanently installed behind the anchor casing of a geothermal well in Iceland. Distributed temperature sensing data has been recorded during the cementation of that casing as well as during the onset of a flow test. Together with numerical studies, temperature data from the cementation could be used to investigate the cement quality behind casing and evaluate the success of the cementation process. Data from the flow testing period could be used to identify a fracture evolution within the cemented annulus during the production of high temperature geothermal fluid. A process influencing the isolation of the cemented annulus, therefore, could be monitored on-line. The application of the distributed temperature sensing technique together with numerical studies proved to be successful in identifying processes affecting the wellbore integrity of a geothermal well.