Wellbore stability and formation damage are of great interest and significance in drilling industry. It is estimated, each year, millions of dollars are lost due to wellbore instability problems which are resulting from exposure of shale to drilling muds. The main objective of this research activity is to improve shale inhibition by using a nanometer shale inhibitor in mud formulation. Furthermore, it is also intended to use this nanoadditive to avoid shale swelling and modify rheological properties. In conclusion, it was found that the most economical and effective concentration of nanoparticles is below 1% w/v, which lead to an acceptable shale inhibition effects by plugging the nanosized pores. The most significant achievement in this research is the cost effectiveness of the nano-drilling fluid. Approximately in all of the previous works, only higher concentrations of nanoparticles (more than 10%wt) can be applicable in the shadow of surfactants and ultrasonication methods for sufficient dispersion. The most striking feature of this research is the consuming of nanoparticles in lower concentrations (maximum 1% w/v) and without the assistance of ultrasonications and surfactants.
Keywords: Nanoadditive, Shale inhibition, Wellbore Stability.
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