ULTimateCO2 project: Field experiment in an underground rock laboratory to study the well integrity in the context of CO2 geological storage
article
Wells drilled through low-permeable caprock are potential connections between the CO2 storage reservoir and
overlying sensitive targets like aquifers and targets located at the surface. The wellbore integrity can be compromised
due to in situ operations, including drilling, completion, operations and abandonment or to geochemical degradation
of the caprock-cement-casing system. We present here an experimental set-up in the underground rock laboratory of
Mont-Terri (St Ursanne, canton of Jura, Switzerland): the drilling and well completion in the laboratory will be done
in the aim of reconstructing interfaces between the caprock, the cement and the casing steel that would be close to the
ones observed in situ. These well features will then be dipped within a CO2 stream, during a given time period before
a final over-coring. Such an experiment should provide new insights on the quality of bounding between
casing/cement/clay interfaces and its evolution due to geochemical reactions. In parallel, a modeling effort is
performed focused on both geochemical and transport aspects of the interactions between the fluids and the well
compartments
overlying sensitive targets like aquifers and targets located at the surface. The wellbore integrity can be compromised
due to in situ operations, including drilling, completion, operations and abandonment or to geochemical degradation
of the caprock-cement-casing system. We present here an experimental set-up in the underground rock laboratory of
Mont-Terri (St Ursanne, canton of Jura, Switzerland): the drilling and well completion in the laboratory will be done
in the aim of reconstructing interfaces between the caprock, the cement and the casing steel that would be close to the
ones observed in situ. These well features will then be dipped within a CO2 stream, during a given time period before
a final over-coring. Such an experiment should provide new insights on the quality of bounding between
casing/cement/clay interfaces and its evolution due to geochemical reactions. In parallel, a modeling effort is
performed focused on both geochemical and transport aspects of the interactions between the fluids and the well
compartments
Topics
TNO Identifier
487366
Source
Energy Procedia, 37, pp. 5722-5729.
Pages
5722-5729
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