| dc.description.abstract | Cement is one of the crucial well barrier elements in the oil well. The well barrier performances of cement depend on the cement composition and good cement job during placement. NORSOK D-010 defined the criterial for cement properties. However, well integrity survey study in the North Sea wells showed that cement related integrity failure recorded about 11% [7]. This shows that the conventional cement slurry does not satisfy the standards requirement.
In the recent years, the application of nanotechnology has shown excellent effect on cement properties. This thesis work experimentally investigates the impact of SiO2 nanoparticle solution on the properties of neat industry cement (C-class) and environmental cement. Moreover, the effect of hybrid SiO2-TiO2 nanoparticles solution on the properties of neat Portland G-class cement.
Results showed that the optimum concentration of the nanoparticles improved the elastic, energy absorption, rheology, heat development, and load carrying capacity of the cement plugs. Among the best results:
The addition of an optimal 0.56 % SiO2 by weight of C-class cement increased the uniaxial compressive strength of the neat cement by 16.7%
The mixture of an optimal 0.13% SiO2 by weight of environmental cement increased the uniaxial compressive strength of the neat cement by 49.6%
The blending of an optimal 0.264 %SiO2 / 0.044% TiO2 by weight of G-class cement increased the uniaxial compressive strength of the neat cement by 8.5%
However, changing the curing temperature and pressure, one may achieve different results. | |
