“…Many attempts have been made to modulate the rheological, filtration, and heat transfer properties of DF formulations using nanoparticles as additives, viscosifiers, LCMs, or density regulators by exploiting nanotechnology. ,,,− The enhancement of their properties due to the inclusion of nanomaterials is attributed to their intrinsic properties at the nanoscale. In fact, nanomaterials formulation must ensure that at least one of their constituents possesses sizes up to 100 nm (1 nm = a billionth of a meter). − At this scale, nanomaterials would exhibit totally different physicochemical properties, including improved electronic properties such as thermal and electrical conductivities, mechanical properties, high specific surface area, magnetism, quantum effects, and antimicrobial activity, among others, if compared with their macroscopic counterpart. ,,,,− Most of the latter characteristic features are often absent in their macroscopic form, and they are closely related to their sizes and morphologies, which can vary from nanoparticles with well-defined geometry (spheres, triangles, squares, rhombuses, and plates), nanorods, nanotubes, nanosheets, etc. ,, Nanomaterials are classified as zero-dimensional such as nanoparticles, one-dimensional such as nanorods nanostructures, two-dimensional such as flat layer-like nanoparticles, and three-dimensional such as those nanostructures formed by the interaction of two or several nanoparticles. ,, Typical nanoparticles used so far in drilling mud formulations include but are not limited to carbonaceous nanostructures (carbon, buckminsterfullerene, carbon nanotubes, and graphene), − copper oxide (CuO), zinc oxide (ZnO), titanium dioxide (TiO 2 ), yttrium oxide (Y 2 O 3 ), ferric oxide (Fe 2 O 3 ), silicon dioxide (SiO 2 ), alumina (Al 2 O 3 ), bismuth ferrite, nanocellulose, nanoclays, and molybdenum disulfide (MoS 2 ). ,,,,,− The fabrication of high-performance hybrid muds based on the association of two or more of the preceding nanoparticles has also been reported. ,…”