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First EAGE CO2 Geological Storage Workshop
- Conference date: 29 Sep 2008 - 30 Sep 2008
- Location: Budapest, Hungary
- ISBN: 978-94-6282-052-4
- Published: 29 September 2008
21 - 38 of 38 results
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Safety Criteria Definition for CO2 Geological Storage
Authors O. Bouc, P. Audigane, G. Bellenfant, H. Fabriol, M. Gastine, J. Rohmer, F. Wertz and M.D. SeyediAddressing safety concerns is crucial for large-scale implementation of CO2 geological storage. This raises many challenges, such as time scales, uncertainties and variability. We try to demonstrate a methodology to establish safety criteria, which are necessarily site-specific. An application for storage in aquifer underneath the Paris Basin supports the exercise. For establishing risk scenarios, nine types of targets have been listed, as well as eleven risk events sorted into five categories. These generic lists constitute a basis for an expert panel to screen a site. The identified scenarios are simulated in terms of effect properties of the risk events. Integrating the outcomes in a site model figuring the stakes shall allow inferring requirements to maintain targets exposure below levels conducting to significant impacts. Simple modelling is favoured: analytical solutions are investigated for the expected behaviour or for well leakage; a semi-analytical model and related abacuses for cap rock fracturing; some events require more elaborated numerical models. Studying the influence of uncertainties is facilitated by using such simple models. Further work includes effectively deducing safety criteria for the application site.
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Second Generation CO2 FEP Analysis: CASSIF- Carbon Sequestration Scenario Identification Framework
Authors F.T. Yavuz, T. van Tilburg and H. PagnierA novel scenario analysis framework has been created, called Carbon Sequestration Scenario Identification Framework (CASSIF). This framework addresses containment performance defined by the three major categories: well, fault and seal integrity. The relevant factors that influence the integrity are identified and expert opinion is a key value within this framework.
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IEA GHG International Research Network, Wellbore Integrity
Authors N Wildgust and T. AikenThe IEA Greenhouse Gas R&D Programme operates a research network on Wellbore Integrity, bringing together experts from research and industry. The network aims to determine the effects of CO2 on wellbore materials and assess the resulting implications for CCS and storage security. The network has identified significant threats to storage integrity, including the presence of old wells, the legacy of poor or inadequate abandonment techniques and the high potential costs involved with the future use of CO2 resistant cements and materials. Potential corrosion of old wells due to prolonged exposure to CO2 could in some cases, cause rapid degradation of wellbore cements and casings, giving rise to leakage pathways from storage reservoirs to the surface. Leakage from old wells could be the main risk factor for storage in depleted hydrocarbon fields, where large numbers of old wells are present. More recently, the network has highlighted a shift from laboratory experiments and modelling, towards practical field studies and the frequent disparity between these two sets of information. For example, laboratory tests frequently show poorer performance of wellbore materials than field observations; further work is required to resolve these discrepancies and allow more realistic risk modelling.
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Interaction of CO2 and Cap Rock
Authors M Soldal, E. Skurtveit, E. Aker and M. AngeliCurrent proposals to reduce atmospheric emissions of anthropogenic greenhouse gases often include the capture of carbon dioxide and subsequent injection into deep subsurface formations. Prior to large-scale deployment of the technique, there are several issues that should be addressed. Leakage into the atmosphere is considered the most crucial concern for geological storage of CO2. Leakage routes could develop through existing wells and pipelines but also by natural migration of CO2 rich pore-fluid through the cap rock and in fault zones. Chemical interaction between the pore fluid and the cap rock may change the material properties of the cap rock. In our study a new experimental setup is tested in order to increase our understanding of the interaction of CO2 with cap rock, with focus on changes in geomechanical and acoustic properties of the rock.
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Field Experiment to Evaluate Impacts of pH Decrease on Marine Microbial Assemblage
Authors C. De Vittor, P. Del Negro, A. Paoli, C. Falconi, M. Celussi, B. Cataletto, C. Comici, C. Fabbro, A. Karuza, G. Caramanna and S. LombardiWe investigated the role of pH reduction, due to natural CO2 release, on the abundance, distribution and diversity of planktonic prokaryotes in seawater. A field experiment has been carried out during May 2008 on the seafloor east of Panarea Island in the Southern Thyrrenian Sea (Mediterranean Sea). Approaching the vent field pH values decreased from 8.1 to 6.3. Microbial assemblages are under analysis.
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Integrated Tectonic and Petrophysical Investigation of the Williston Basin Sediments in and around the Weyburn CO2 Sequestration Reservoir, Canada (Part 1 - Tectonic Considerations)
More LessWithin this Phase I of the International Weyburn CO2 Sequestration Project results of regional seismic /well log investigations are presented from a region of around 100 km radius of the storage site in Southern Saskatchewan (Figure 1, 1a). The objective is to answer the following question: Do the tectonic, petrophysical and rheological properties of the sedimentary fill guarantee the permanent storage (~10000 years) of CO2 in the region? To answer the question both regional and detailed tectonic setting as well as the history of the tectonic activities of the subsurface were investigated. A number of prominent fault systems were recognized. Some of these are the consequence of the original tectonic development of the region. A number of them were created by the dissolution of the salts of the underlying Devonian Prairie Evaporate formation. Several of these anomalous zone were reactivated a number of times, some as recently as Mid-Cretaceous times.
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Integrated Tectonic and Petrophysical Investigation of the Williston Basin Sediments in and around the Weyburn CO2 Sequestration Reservoir, Canada (Part 2 - Petrophysical Considerations)
More LessThe successful long-term underground storage of CO2 requires a stable and permanently sealed storage site. In search of this facility, a two phase, comprehensive study investigated the tectonic setting and history as well as the petrophysical properties of the Weyburn reservoir in the Williston basin of southern Saskatchewan. Within the first part, small scale structural disturbances (i.e. faults with small offsets/local flexures) have been identified above the reservoir and in zones of the overlying seal. The preliminary results of the second part, the petrophysical study of some of these anomalous are reported here.
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EOR Experience and the Future
By R. BakerThis paper will analyze the response of oil rate to CO2 injection in various fields worldwide including Weyburn and Joffre. Epic consulting has completed a detailed CO2 screening of all reservoirs in Alberta, Saskatchewan, Manitoba, and Ontario. The importance of using both static and dynamic screening parameters will be emphasized. Also, the concept of CO2 retention which is important for CO2 sequestration will be explored. Epic has also generated an analytical program that uses both experimental and empirical concepts to forecast the expected oil rate response to miscible CO2 injection. Results of the program will be compared to field cases. Lastly, reservoir simulation results for vertical CO2 miscible floods in Niagaran reefs in Michigan will be presented.
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Plume Estimation around Well KB-502 at the In Salah Gas Development CO2 Storage Site
Authors P.S. Ringrose, A. Mansour, D. Mason, M. Espinassous, O. Myhrer and M. IdingDetailed case history after 4 years injection in one well at the In Salah Gas development CO2 storage site. Alternative modelling approaches and available well monitoring data and satellite ground deformation data are integrated to build up an estimate of plume development.
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