Abstract
The present review article expresses the effectiveness of different types of Multi-Wall Carbon Nanotube(s) (MWCNT) on the rheological properties of Water-Based Mud drilling fluid. Shale formations are troublesome according to their water sensitivity characteristic, low Nano-Darcy permeability with small nanometer-sized pore throats that are not effectively sealed by the solids in conventional drilling fluids. Water invasion into the shale formations causes different problems in the drilling industry. Nanoparticle additives have the potential to be used in drilling operations due to their large surface area and lower kinetic energy than micro-additives. The test results demonstrate that multi-wall carbon nanotube improves the rheological properties of the WaterBased Mud drilling fluid. Acidic-surface modified carbon nanotube in the presence of Polyethylene Glycol (PEG) increases the plastic viscosity and yield point of the sample more than unmodified carbon nanotube and hybrid multiwall carbon nanotube. Test results show that multi-wall carbon nanotubes (MWCNT) improve shale stability and shale recovery, finally leading to more well-bore stability in shale formations.
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