Characterization of the mechanisms controlling the permeability changes of fractured cements flowed through by CO2-rich brine
MetadataShow full item record
Experiments were conducted to assess the potential impact of fractured well-cement degradation on leakage rate. Permeability was monitored while CO2-enriched reservoir-equilibrated brine was flowed at constant rate through a single fracture in a class G cement core under conditions mimicking geologic sequestration environments (temperature 60 C, pressure 10 MPa). The results demonstrate that, at least for the conditions used in the experiment, an initial leakage in a 42 µm aperture fracture (permeability = 1.5 × 10-10 m2) can be self-mitigated due to the decrease of the fracture hydraulic aperture after about 15 h. This decrease results from the development of continuous highly hydrated amorphous Si-rich alteration products at the edge of the fracture and the dense carbonation of the bulk cement that mitigate the penetration of the alteration front. © 2013 American Chemical Society.
Showing items related by title, author, creator and subject.
Ahmed, Shaikh; Maalej, M. (2007)In this paper experimental evaluation on the effect of high volume fly ash as partial replacement of cement on fracture toughness of cement mortar are presented. The fly ash replacement level was 50%, 60% and 70% by weight ...
Fallahzadeh, S.; Rasouli, Vamegh (2012)Hydraulic fracturing is a stimulation technique which is used, in particular in unconventional reservoirs such as shale gas and tight sandstones, in order to en-hance production of hydrocarbon. Hydraulic fracturing is ...
Characterization and modeling of the alteration of fractured class-G Portland cement during flow of CO<inf>2</inf>-rich brineAbdoulghafour, Halidi; Gouze, P.; Luquot, L.; Leprovost, R. (2016)© 2016 Elsevier LtdWe investigate experimentally the alteration of fractured class-G cement flowed by CO2-rich brine. The experiment mimics a mechanically damaged rough-walled fractured cement annulus at temperature 60 °C ...