Investigação do efeito da concentração de nanografite nas propriedades reológicas de fluidos de perfuração

Abstract

The analysis and interpretation of the rheological behavior of drilling fluids and their changes in temperature variations in the medium is of great importance in the oil industry. Within this context, a new basis for studying the formulation of more versatile drilling fluids to different conditions of the medium is gaining more space: the use of nanomaterials as additives in the dispersed liquid medium of drilling fluids. The most used nanocompounds are known as carbon nanomaterials, among which the following stand out: graphite, graphene and graphene oxide. However, there are still difficulties in suspending this material in the fluids used and the analysis and interpretation of the viscoelastic parameters of the obtained compounds still present promising research possibilities. The objective of the work is to define and characterize a methodology for the formulation of drilling fluid added with graphite nanoparticles, seeking to understand the effect of different concentrations of the material on its rheological properties and how such nanoparticles can influence in terms of stability of the fluid properties when subject to thermal degradation processes, such as through the thermal aging process. The main properties evaluated are: dynamic yield stress, static yield stress and linear viscoelasticity limit. In addition to these parameters, the storage and dissipation modulie valuated under the linear viscoelastic regime will be used in a comparative way between the results obtained for the different concentrations of graphite and test conditions (aged sample and non-thermally aged sample). The results indicate that drilling fluids formulated with graphite nanoparticles have a better thermal stability of their evaluated properties when compared to the base sample without the addition of the nanocompound. Oscillatory tests results indicate that the storage and dissipation modules undergo few changes due to thermal aging for the samples formulated with graphite, evidencing the premise proposed by the work.