Experimental assessment of well integrity for CO2 geological storage: A numerical study of the geochemical interactions between a CO2-brine mixture and a sandstone-cement-steel sample

Hydrated Ordinary Portland Cement as a Carbonic Cement: The Mechanisms, Dynamics, and Implications of Self-Sealing and CO₂ Resistance in Wellbore Cements

“…Several recent efforts have developed similar reactive-transport models for this system Blanc et al, 2010;Brunet et al, 2013;Abdoulghafour et al, 2016;Brunet et al, 2016;Huerta et al, 2016;Tremosa et al, 2017), using a variety of simulation codes, thermodynamic representations, and kinetic models. In this effort, we build on a kinetic and thermodynamic model we developed for acid-base alteration of hydrated-cement and silica-rich aggregates (Guthrie and Carey, 2015).…”

Wellbore integrity in a saline aquifer: Experimental steel-cement interface degradation under supercritical CO2 conditions representative of Brazil’s Parana basin

“…Most studies focus only on one of the wellbore system materials (cement or casing or formation). Thus, there is lack of information on how these systems interact throughout the degradation process (Jobard et al, 2018;Tremosa et al, 2017). Thus, the mass flow exchange between the cement and casing materials, and the reactions of the cementcasing system have been insufficiently studied by the researchers and are poorly reported in the literature.…”

“…However, as scanning advances through the bicarbonated zone to the interfacial defect region (from point 2-3), the Ca content reduces, and Si content increases due to the bicarbonation process involving the carbonate dissolution and formation of amorphous silica. In addition, the Fe content increases near the interfacial defect region indicating Fe ions migration from the corroded steel surface to the cement matrix, being subsequently fixed by precipitation in carbonate form (Tremosa et al, 2017;Wolterbeek et al, 2013).…”

“…In CCS operations, drilling and completion of wells are crucial steps to access the host reservoir (Ahdaya et al, 2019). The wells are basically composed of a steel casing protected by a cement sheath (Garcia Fernandez et al, 2019;Tremosa et al, 2017). In the completion step, the cementation operations involve the removal of drilling mud and the filling of the annular space between the formation and steel casing with cement paste, to stabilize the well structure and provide the hydraulic seal after cement curing (Omosebi et al, 2016;Wakeel et al, 2019).…”

“…Currently, most studies only focus on one of the wellbore system materials (formation-cement-casing) and, although significant work has been done to assess the integrity of the formation-cement interface Milestone, 2018a, 2018b), there is a lack of information about the integrity of the cement-casing interface and how the materials interact during the CO 2 degradation process (Jobard et al, 2018;Tremosa et al, 2017). Studies of cement carbonation (Bihua et al, 2018;Koukouzas et al, 2017) and steel casing corrosion (Nešić, 2007) are numerous.…”