Final phase of successful geological storage of carbon dioxide. In the current field experiment, brine was continuously injected since 12th of October, 2015, into the CO2 reservoir, a porous sandstone layer located at a depth between 630 m and 650 m.
A field experiment on brine injection at the pilot site Ketzin/Havel, operated by the German Research Centre for Geosciences (GFZ), ended successfully on 6th of January, 2016. It marks the last field experiment with respect to the geological storage of CO2 at Ketzin.
In the current field experiment, brine was continuously injected since 12th of October, 2015, into the CO2 reservoir, a porous sandstone layer located at a depth between 630 m and 650 m. During 88 days, almost 2,900 tonnes of brine were pumped into the CO2 storage.
The brine has a chemical composition comparable to the brine that naturally occurs in the reservoir rocks. The brine was delivered by tank trucks whereby several containers were used for the intermediate storage.
The GFZ pilot's location Ketzin accommodates Europe`s biggest research project related to the geologic storage of the greenhouse gas carbon dioxide. Since 2008, more than 67,000 tonnes of CO2 were stored in the underground in order to investigate this approach towards greenhouse gas reduction. The stored carbon dioxide replaced the salty natural pore water.
However, for a long-term storage it is expected that this pore water will flow back into the reservoir rock and mix with the injected CO2. The brine injection experiment simulated this natural backflow and the associated displacement of the CO2 in time-lapse mode.
Two main objectives were pursued in this regard: On the one hand it should be determined how much of the CO2 residing in the pore space can be displaced by the injected brine. On the other hand it should be examined which differences exist between the displacement of the formation fluids by CO2 during the CO2 injection and the displacement of the CO2 by brine during the brine injection.
Besides, the experiment is also another safety test: it is examined whether the brine injection is suitable as a possible remediation technique in case of a CO2 leakage by displacing the CO2 from the pores of the reservoir rock in the near wellbore area. “Our overall research results have shown that the geologic storage of carbon dioxide is a reliable and feasible way at adequate scientific and technical assistance“, according to Axel Liebscher, head of the section Geologic Storage at GFZ.
„The new findings on the brine and gas behaviour are central metrics in assessing the long-term behaviour and safety of CO2 storage. With the recent field experiment, we are now able for the first time to verify and validate the data on residual CO2 saturation, usually only derived from lab tests, under real geological conditions.“
The propagation of the injected brine and the associated displacement of the stored CO2 near the wellbore have been simulated before the field experiment started and it was monitored during the experiment in particular by aid of a geoelectric measuring system which recorded the electrical conductivity in the underground.
This monitoring network, which was already installed behind the casings in 2007 before the beginning of the real CO2 injection, permits conclusions on the spatial distribution of brine and CO2. Beside the geoelectric measurements, the field test was accompanied by continuous monitoring of pressure and temperature conditions in the injection well as well as in two neighbouring observation wells.
Already in October, 2014, another field experiment had been carried out successfully on the back production of CO2 from the storage reservoir. The operative life cycle of the CO2 storage in Ketzin is now finished within the running project COMPLETE.
In current year 2016, the remaining four wells will be backfilled successively and the site will be re-cultivated. The life cycle of the storage site ends finally with the return of the liability from GFZ to the mining authority of the federal state of Brandenburg after the integrity of the storage complex has been proved.
„Together with the knowledge from the active CO2 injection, both field experiments, the back production and the brine injection, enable us to understand the processes before, during and after a CO2 storage in detail and to prove the functionality and integrity of the CO2 storage at Ketzin“, Axel Liebscher concludes.
More information on the pilot site Ketzin can be found on the website: http://www.co2ketzin.de
Photo in printable solution may be found here:
Caption: Delivery and intermediate storage of brine for a continuously injection into a depth of 630 m, October 2015 (Photo: T. Kollersberger, GFZ)
Dipl.Met. Franz Ossing | Helmholtz-Zentrum Potsdam - Deutsches GeoForschungsZentrum GFZ
Receding glaciers in Bolivia leave communities at risk
20.10.2016 | European Geosciences Union
UM researchers study vast carbon residue of ocean life
19.10.2016 | University of Miami Rosenstiel School of Marine & Atmospheric Science
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.
In 2016, the joint pavilion by the IVAM Microtechnology Network, the Product Market “High-tech for Medical Devices”, will be located in Hall 8a again and will...
'Ferroelectric' materials can switch between different states of electrical polarization in response to an external electric field. This flexibility means they show promise for many applications, for example in electronic devices and computer memory. Current ferroelectric materials are highly valued for their thermal and chemical stability and rapid electro-mechanical responses, but creating a material that is scalable down to the tiny sizes needed for technologies like silicon-based semiconductors (Si-based CMOS) has proven challenging.
Now, Hiroshi Funakubo and co-workers at the Tokyo Institute of Technology, in collaboration with researchers across Japan, have conducted experiments to...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
21.10.2016 | Health and Medicine
21.10.2016 | Information Technology
21.10.2016 | Materials Sciences