Estudo reológico de fluidos olefínicos de perfuração de poço de petróleo

Abstract

The demand for energy and plastic materials is increasingly driving technological development to increase the efficiency of extraction of the respective raw material: oil. That way, a very important step to obtain this fossil oil is the oil well drilling process, which requires the use of a drilling fluid to maintain the stability of the well walls, such as carrying the cuttings to the surface of the well. To perform these functions, the drilling fluid must have a pseudoplastic rheological behavior, that is, it must have low resistance to flow when subjected to high deformation rates. In this context, this work aims to evaluate the rheological properties of two real olefinic fluids from oil well drilling that, according to the company that made them available, should follow the pseudoplastic behavior. The fluids were studied in a spindle viscometer in cone-plate geometry under normal conditions of temperature and pressure in different rheological analyses, using the viscosity diagram, peak stress and thixotropy. Such analyzes allow evaluating and classifying the rheological character of fluids. That way, it was possible to confirm the pseudoplastic and thixotropic character of the fluids and admit their importance for efficient drilling in oil wells that are filled with this suspension.