The Ketzin pilot site for geological storage of CO2 located about 25 km west of Berlin was the first European pilot site for onshore storage of CO2 in saline aquifers. A total amount of 67 kilotons of CO2 was injected without any safety issues between June 2008 and August 2013 when the injection ceased and the site entered its post-closure phase. Within this phase a multidisciplinary monitoring program continues and the five research wells are stepwise abandoned in order to address and finally close the entire life cycle of the storage site. In October 2014, a two-week field experiment was carried out with the aim to back-produce parts of the injected CO2 and to study the reservoir and wellbore behaviour. In this contribution, we present a comprehensive overview on the status of the Ketzin site in its second year of the post-closure phase and the main results of the field experiment on CO2 back-production.


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