The Ketzin Pilot Site for CO2 Storage in its Second Year of the Post-closure Phase

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.