Abstract
Drilling operationsrequire suitable drilling fluids to maintain the wellbore stability by stabilizing the shale formations near well bore that are prone to swelling and collapse due to their interaction with water in drilling fluid. The conventional drilling fluids are not effective in maintaining the shale stability due to bigger size of mud additives compared to shale pore spaces. Water based mud, when added with suitable volume of nanoparticles shows improvement in well bore stability, besides improvement in mud rheology and its thermal characteristics. Addition of nanoparticles and shale inhibitors to drilling fluids significantly improves well bore stability in shale sections of well bore. Nanoparticles added with shale inhibitors produce synergic effect to achieve efficient shale inhibition. Therefore, nanocomposites combined with nanoparticle and shale inhibitor improve the shale section well bore stability compared to nanoparticles and the conventional shale inhibitors. This paper presents the effect of different nanocomposites on shale inhibition, their inhibiting mechanism and their associated advantages and disadvantages.
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