Desenvolvimento de fluidos de perfuração poliméricos a base de microemulsões e avaliação de suas propriedades

Abstract

The use of drilling fluids ensures greater efficiency of oil drilling, as they perform a number of functions and are capable of profoundly influencing this process, both improving or hindering the drilling process. The different types of drilling fluids and their applicability cause constant studies on their formulation. Thus, microemulsion systems (SME's) have been evaluated as a good proposal among the additives used in the formulation of these fluids, given that these systems present lubricity and stability that can be transferred to the drilling fluid. This work aimed to develop drilling fluids using oil in water microemulsions (ME's), as well as to analyze their properties compared to the literature. For this, several SMEs were initially tested in order to find the one that presented a good oil in water ME region to prepare the fluid. The system found was composed of industrial water and glycerin in the aqueous phase, Alkonat 70 nonionic surfactant and paraffin or olefin as the organic phase. From these systems, an experimental design was elaborated to evaluate the influence of the percentage of glycerin in the aqueous phase and the NaCl concentration in the properties of the drilling fluid, finding an optimized fluid whose characterization was made later. The results showed that microemulsion fluids presented as an alternative for drilling fluids, considering that their rheological properties were considered satisfactory even after the aging of the fluids, in addition to presenting very low fluid loss control volumes. Besides that, the optimized fluid presented 24.5% of glycerin in de microemulsion aqueous phase and 2.55 g of NaCl as an obturant of the fluid and it was evaluated as a fluid with satisfactory rheological and filtrate properties according to de Petrobras N-2604 standard and have better properties than aqueous fluid, as well as similar or better properties than non-aqueous fluids that were studied in the literature.