Estudo de composição de argilas organofílicas para fluidos de perfuração de poços de petróleo em águas ultraprofundas.

Abstract

Unlike the global scenario, the largest Brazilian oil fields are offshore, which makes its operation a growing challenge, because every day they are discovered reservoirs in water depths deeper. These perforations becomes necessary to use organic base drilling fluid rheological properties because they have more stable, compared to water-based fluids. The organoclays constitute an essential input to the development of organic base drilling fluids. Paraiba has large deposits of bentonite, especially in the city of Boa Vista, where because of the exploration process, the bentonite better for uses in drilling fluids are no longer found. In this study organophilizated three types of clay and their compositions were introduced in the formulation of paraffin based fluids, ester and diesel, aiming to evaluate the performance of these fluids for various rheological and filtration. The results show the importance of study of organoclay compositions and feasibility in obtaining fluids with satisfactory rheological behavior, increasing the use of clays of lower quality. The compositions of bentonite clays from Boa Vista, PB, organophilizated, have a behavior similar to that of standard industrial VG69®, which may replace the industrialized, for use in drilling fluids for oil wells organic basis. The ester base fluids are promising, with properties that meet the restrictions of the API (2005) and still have the advantage of causing less environmental impacts when compared with the fluid organic base diesel.