Final phase of the project on the geological storage of CO2
04.07.2015: Today the final phase of the project on the geological storage of the greenhouse gas carbon dioxide at Ketzin/Havel started with the abandonment of the first of five wellbores.
After successful completion of the active injection and the monitoring phase the final project phase termed COMPLETE will now stepwise abandon all wellbores of the pilot site according the regulations set by the German mining law. With this the pilot project on the geological storage of the greenhouse gas CO2, which is operated by the GFZ German Research Centre for Geosciences, now enters its terminal phase.
The abandonment of the wellbore is done in a stepwise manner. The wellbore is completed with successive casings with decreasing diameters. The lower part of the innermost casing is cut at about 459 meter depth and pulled out. Subsequently, the wellbore is cemented up to a depth of 275 meter. After hardening of this first cement bridge, the next bigger casing is cut at about 265 meter depth, pulled out and the wellbore cemented up to the surface.
The well abandonment is completed by deconstruction of the wellbore cellar and its foundation. „The now started work will provide first-hand results on the safe abandonment and closure of a CO2 storage site that are also internationally unique“, explains Axel Liebscher, Head of the Centre for Geological Storage at the GFZ.
What sounds as unspectacular routine work at a first glance, signalises the finalization of a more than ten years lasting scientific and engineering success story. „Together with its precursor projects CO2SINK and CO2MAN the ongoing project COMPLETE closes for the first time the complete life cycle of a CO2 storage site at pilot scale “, Axel Liebscher continues.
„Our research that already started in 2004 provided fundamental knowledge on construction, monitoring, operation and behaviour of a CO2 storage site from the exploration to the closure phase.“ Thereby, the pilot site Ketin comes up with the worldwide most comprehensive surface and subsurface monitoring network for surveillance of the CO2 storage operation.
Liebscher: „We were able to prove that this technology is generally feasible. With fit-to-purpose designed scientific and technical monitoring, CO2 can be safely stored in the subsurface if the geological conditions are suitable.“
After comprehensive pilot survey and the construction of the required infrastructure, a total of about 67,000 t CO2 have been injected at the Ketzin pilot site between June 2008 and August 2013 into porous sandstone at a depth of about 630 to 650 m. In autumn 2013 directly after termination of the injection the observation well Ktzi 202 was partly abandoned with CO2 resistant cement up to a depth of 521 m.
This cementation has been scientifically monitored over more than one and a half year before now the final abandonment of the well started. At the beginning of the final abandonment a three meter long core was drilled and recovered from the first cementation and surveyed on-site.
„Both, the scientific monitoring and survey of the recovered cement core showed, that the cementation performed in autumn 2013 has been successful. We therefore continued with the final abandonment of the well“, Axel Liebscher explains. The remaining four wells at the site will be abandoned and deconstructed in 2016, so that the initial conditions of site will be re-established in 2017.
Further information on the pilot site Ketzin: http://www.co2ketzin.de
Franz Ossing | Helmholtz-Zentrum Potsdam - Deutsches GeoForschungsZentrum GFZ
Massive impact crater from a kilometer-wide iron meteorite discovered in Greenland
15.11.2018 | Faculty of Science - University of Copenhagen
The unintended consequences of dams and reservoirs
14.11.2018 | Uppsala University
Researchers at the University of New Hampshire have captured a difficult-to-view singular event involving "magnetic reconnection"--the process by which sparse particles and energy around Earth collide producing a quick but mighty explosion--in the Earth's magnetotail, the magnetic environment that trails behind the planet.
Magnetic reconnection has remained a bit of a mystery to scientists. They know it exists and have documented the effects that the energy explosions can...
Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.
Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...
Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.
In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...
On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.
When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure
Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...
09.11.2018 | Event News
06.11.2018 | Event News
23.10.2018 | Event News
16.11.2018 | Health and Medicine
16.11.2018 | Life Sciences
16.11.2018 | Life Sciences