Abstract
Maintaining the integrity of the cement used to seal off the injection intervals of sequestrations sites is crucial to confine CO2 for thousands of years. There have been many studies to resolve the issue of cement degradation induced in the presence of CO2, but a very limited success has been reported to the application of the approaches proposed so far. Nano materials have gained the attention of many researchers in the past decade and might be able to resolve the issue of cement degradation given their outstanding performance and proven applications in the civil and polymer industries. In this paper, attempts are made to improve the physical and mechanical characteristics of class G cement using nano glass flakes (NGFs) and multiple-walled carbon nanotubes (MWCNTs). To do this, different cement-nanocomposites were prepared using two mixing techniques and their physical and mechanical changes were evaluated under different curing conditions. Samples with cylindrical shape of were prepared and cured under the temperature of 50°C and atmospheric pressure for 1 days. The results obtained indicated both nanoparticles are neutrally stable and may have a very slight effect on the cement rheology but may significantly increase the strength of the cement. It was concluded that the cement with 0.05 wt.% MWCNTs can provide the best results in terms of rheology, compositional changes and compressive strength.
Highlights
Oil well cementing is considered as one of the important activities for drilling operation as it determines the well sustainability
Based on the API Specification for Well Cementing 10A, typical wellbore cements are made of Ordinary Portland Cement, either class G or class H cements
Both of them are commonly used to seal off the injection intervals in carbon dioxide (CO2) sequestration
Summary
Oil well cementing is considered as one of the important activities for drilling operation as it determines the well sustainability. Based on the API Specification for Well Cementing 10A, typical wellbore cements are made of Ordinary Portland Cement, either class G or class H cements. Both of them are commonly used to seal off the injection intervals in carbon dioxide (CO2) sequestration. Under these circumstances, cement is subjected to high pressure and high temperature condition of subsurface layers and exposed to supercritical CO2, which are favorable for cement degradation to take place. The porosity and permeability of the cement will be increased, at the same time, the cement strength will be reduced [1]
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