Abstract
The main purpose of designing cement slurry for extreme and deep environment (HPHT wells) is to develop high performance cement system in well bore to achieve zonal isolation. The primary objective of cement slurry is to improve rheological properties and displacement efficiency of cement system. Oil well slurries depend on its homogeneity of additive concentrations, quality and quantity to contribute the placement and success of a well drilling cementing operation. This research study is focused on the laboratory study of the High Performance Cement System (HPCS). This investigation of cement slurry was prepared with Silica Fume (SF) and excess amount of water to decrease the slurry density in order to observe the rheological properties above 120C at different concentration of SF. Results indicates that the designed cement rheological properties are directly influenced by the shear rate and shear stress on the pump-ability of the cement with the increase of the SF concentration for the rheological improvement.
Highlights
During a well cementing operation purpose should be achieve zonal isolation (Nediljka et al, 1994)
That belongs to the slurry design, to ensure the best quality of cementing especially at high temperature environment such a High Performance Cement System (HPCS) Silica Fume (SF) use as a cement slurry additive to reduce the density of cement (Siddique and Khan, 2011)
It is highly effected on the performance of slurry and water cement ratio considerable for using the density of 13 PPG cement slurry with 15% SF to a great
Summary
During a well cementing operation purpose should be achieve zonal isolation (Nediljka et al, 1994). It is responsible to prevent gas migration and highly effective for proper placement and decrease permeability for better control of weak zones (Siddique and Khan, 2011). Compressive strength of concrete containing SF was proved higher strength; as increase the concentration of silica fume it improves stress resistance in the early development and reduces the free water (Mehta and Gjorve, 1982). Particle size of silica fume is very small (less than 0.5 microns) and can result filler cake between the cement particles and mitigate the entry of a narrow path of fluids, which decrease permeability of the cement slurry and enhanced Water Cement Ratio (WCR).This improves the permeability which increasing the performance of cement slurry (Shahriar and Nehdi,2012). This study is related with various concentration of silica fume for preparing 600 mL cement slurry for high performance cementing operation
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