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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

2021; Elsevier BV; Volume: 109; Linguagem: Inglês

10.1016/j.ijggc.2021.103337

1750-5836

Gabriela Gonçalves Dias Ponzi, Victor Hugo Jacks Mendes dos Santos, Renan Bordulis Martel, Darlan Pontin, Amanda Sofia de Guimarães e Stepanha, Marta K. Schütz, Sonia C. Menezes, Sandra Einloft, Felipe Dalla Vecchia,

Drilling and Well Engineering

This study proposes the application of basalt powder (BP) as a supplementary cementitious material (SCM) in cement formulations for Carbon Capture and Storage (CCS) wells. From experimental results, we identified that the BP can be characterized as a filled-pozzolanic SCM, presenting low pozzolanic activity, large inert fraction, and particle size significantly smaller than class G cement. Formulations with low basalt powder (≤ 0.5 wt.%) content presented the greatest potential for application in CCS wells since they are more resistant to CO2 degradation, showing low porosity and suitable mechanical properties, as evidenced in carbonation tests. Due to basalt powder characteristics, we conclude that the increase in the chemical resistance of the cement formulation with low BP content is due to the reduction of both the porosity and permeability as a result of filling of empty spaces and the refinement of the porous cement network, allied to the low reduction of the alkaline reserve of portlandite. The combination of these features increases the material's resistance to fluid intrusion, reduces the progress of the CO2 degradation front, and preserves the cement matrix's ability to delay the reaction of acid gases.