Obtenção de zeólita sintética para produção de fluidos de perfuração base oleosa

Abstract

The zeolites are part of a large group of porous solids that are defined as crystalline aluminosilicates with a three-dimensional structure composed of a set of cavities occupied by large ions and water molecules, both with considerable freedom of movement, allowing ion exchange and hydration reversible. These materials can be obtained in a number of ways, and an effective way to synthesize the zeolites is the use of amorphous sediments where a mixture of Si and Al species, metal cations, organic molecules and water are converted through a solution supersaturated in a microporous crystalline aluminosilicate. The precursor raw materials used in the present work were amorphous silica and amorphous alumina obtained by the Pechini method, which consists of a method of producing alumina from a polymeric precursor. This method has been shown to be very effective in the preparation of powders with high homogeneity and chemical reactivity, whose transformation into zeolites occurs through alkaline activation with sodium hydroxide (NaOH). This study aims to obtain synthetic zeolites for further treatment with ionic surfactant making them organophilic for application as a viscosifying agent for oily base drilling fluids. The samples were characterized by X-Ray Diffraction (XRD), X-Ray Fluorescence (FRX), Differential Thermal Analysis (DTA) and Thermogravimetric (TGA) and Scanning Electron Microscopy (SEM) techniques. The analysis of the viscosifying properties was based on the Petrobras standard EP-1EP-00023A. The results showed the obtaining of type A and sodalite zeolites at all concentrations and times of 3.05 or 3.5 M NaOH for 6, 12 or 24 hours. No benefit of organophilization of the samples was found to be used as a viscosifying agent in oily base drilling fluids. With the determination of the apparent viscosity, it was observed that the materials obtained do not meet the normalized viscosity values.