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This study was aimed to investigate the rheological properties and the possibility of nano(Na, Ca )- bentonites nanoproducts to meet the required drilling mud properties. Sepiolite (Sp) and the mixture of 2% nanoNaB with 1% Sp were collected and prepared from Irans oil Company (NIOC). The nanoclay performance evaluation involved the experimental tests of the rheological properties, filtration and gel strength. According to the results obtained from flow properties tests for the mixture, it was indicated that the mixture was not adequate to be a suitable drilling fluid. The main objective was to make stable dispersions with nanobentonite and sepiolite by using a water soluble polymer as stabilizer. The changes in the rheological properties of bentonite were investigated at various concentrations of polyvinyl alcohol (PVA) to discover the stability of the dispersions. The standard API tests were applied for drilling fluid to determine the properties of dispersions.

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Nine different formulations were built and subsequently their rheological properties were measured according to American Petroleum Institute (API). Porous media model was designed by Corel DRAW (Corel Corporation of Ottawa, Canada)computer software and applied on the glass. Using this kind of micro-models enable us to design the porous media with real dimensions. Statistical analyses showed that 75%wt of nanoclay suspension and Poly anionic cellulose could successfully improve the rheological properties. The existence of nanoclay in the suspension could significantly compensate viscosity reduction up to two times by increasing shear rate.