A methodology to improve nanosilica based cements used in CO2 sequestration sites

Time-Resolved SAXS Investigation of Correlation-Collapse in Self-Assembled Silica Microgranules during Pozzolanic Gelling

“…Pozzolans are primarily siliceous/aluminous substances, which themselves possess no cementitious value; however, in the presence of moisture, they chemically react with alkali hydroxide to form compounds having cementitious properties. In this regard, use of tiny silica has been found to be quite effective. − In the recent past, the effects of nanosilica on cement pastes, mortars, and concrete have been investigated and it was shown that it improved the strength owing to the accelerated pozzolanic reaction, reduced porosity, and enhancement in the interfacial transition zone. , However, often the uncontrolled agglomeration and flocculation of such small particles remains a crucial issue affecting rheological and hardening behavior. Here, we have adopted a novel approach in this work.…”

Improvement in gas migration reduction in oil wells by using nanoparticles: an experimental investigation

“…This achievement shows the adhesion of the grains and, thus, the strength of the cement slurry. So, it can be concluded that nanoparticles not only did not reduce strength capacity of the slurry, but also improved this important property especially in the absence of anti-gas migration additive [32].…”

Basalt powder as a supplementary cementitious material in cement paste for CCS wells: chemical and mechanical resistance of cement formulations for CO2 geological storage sites

“…CCS technologies have been studied from conceptual assessments to implementation in large-scale projects, as a technology to permanently store CO 2 in geological formations such as coal seams, depleted oil and gas fields and deep saline aquifers (Abid et al, 2018;Iglesias et al, 2015;Metz et al, 2005;Tiong et al, 2019). In this process, an essential step to access the deep geological formations is carrying out drilling and well completion (Carroll et al, 2016;Torsaeter et al, 2015;Wakeel et al, 2019).…”

“…The cement sheath protects the steel casing, stabilizes the geological formation and generates the hydraulic seal that prevents the uncontrolled flow of fluids in the storage site through a tight bond between the formation-cement-casing system (Jobard et al, 2018;Tremosa et al, 2017). However, the same structures used for CO 2 injection into the reservoirs can constitute potential paths for gas leakage into shallow geological structures, or back to the atmosphere (Abid et al, 2018;Carroll et al, 2016;Dong et al, 2020). Thus, ensuring the wellbore integrity throughout its life cycle (construction, injection, monitoring and abandonment) is a key issue for CCS projects (Kiran et al, 2017;Omosebi et al, 2017;Postma et al, 2019).…”

“…Among materials used in the wellbore construction, cement has been receiving special attention from the academic community and Oil & Gas companies, since its components are not stable in CO 2 -rich environments (Teodoriu and Bello, 2020;Wang et al, 2017). From laboratory scale studies to field sampling, it is widely documented that cement is susceptible to significant changes when exposed to supercritical CO 2 , so compromising the wellbore integrity and the permanent carbon storage (Abid et al, 2020(Abid et al, , 2018Carey et al, 2007;Szabó-Krausz et al, 2020;Teodoriu and Bello, 2020).…”