In recent years, the application of nanomaterial has been attracting the oil and gas industry. Nanomaterials research results show an improving performance of cement, drilling fluid and enhanced oil recovery. In this paper, the effect of multi-walled carbon nanotube (MWCNT) and MWCNT functionalized with ligands–OH and - COOH nanoparticles on laboratory drilling fluids formulated from bentonite, KCL, Carboxymethyl cellulose (CMC) and xanthan gum (XG) was studied. The formulations and tests were performed at room temperature. The results show that addition of 0.0095wt.% of MWCNT, MWCNT-OH and MWCNT-COOH nanoparticles in CMC/bentonite system decreases the filtrate-loss by 8.6 %, 7.1 % and 17.9 % respectively. These particles also decreased the coefficient of friction by 34 %, 37 % and 33 % respectively. In xanthan gum drilling fluid, 0.019wt%. MWCNT reduced the friction coefficient by 38 %.

Recently the application of nanomaterial is attracting the oil and gas industry. The preliminary nanomaterials research results show an improving performance of cement, drilling fluid and Enhanced Oil Recovery. In this paper, the effect of nano Silicon dioxide (SiO 2 ) on polymer (HV-CMC, Xanthan gum, LV-CMC) and salt (KCl, NaCl) treated bentonite drilling fluid systems has been studied at room temperature. The results show that the performance of nano SiO 2 in bentonite mud system depends on its concentration and the types of salt and polymer systems used. In the considered fluid systems, it is also observed that the addition of about 0.06% SiO 2 influences rheology, and filtrate loss of the drilling fluid systems. The viscoelasticity of the selected best system further studied and their hole -cleaning and hydraulics performances are simulated. The overall result shows that the formulated optimum concentration of nano-system shows good performances and rheological behavior.

The principal goal of the paper is to reveal whither principal Newton’s fundamentals may give reliable explanations at examining fracture mechanics of multi-layered nanostructured coatings and composites or they should be corrected with new theories. The core of principal Newton’s fundamentals was combined with rheological modeling for describing stress-deformations of nanostructured coatings. Alumina-based or diamonds-containing composites were studied by in-situ cases. The use of indentation at micro and nanoscales with rheological models as a method for determining the fracture of multi-layered brittle coatings is described. Rheological behavior of the model under localized loading and different initial stress and deformation states was studied. Advantage of the method revealed here is that the only quantity to be measured is a deformation or a fracture load. By measuring this minimum load (and that is the only quantity that must be measured) an accurate estimate of fracture may easily be made with application of rheological modeling. Finally, discussion concerned about a scale at which rheological modeling may be effectively applied to examine the fracture mechanics of nanostructured coatings and composites.