Formulação e análise de propriedades de fluidos de perfuração microemulsionados

Abstract

Drilling fluids are indispensable in the operation of drilling oil wells, and their efficiency in this operation is associated with their properties. In this work drilling fluids were obtained from microemulsions and properties such as mass loss, filtrate volume and rheological parameters were analyzed. Two types of clay were used in the formulation of the fluids and, after analyzing the diffractograms, it was verified that they are predominantly composed of clay minerals of the smectite group. The fluids followed the Herschel-Bulkley model, with the fluids formulated with bentonite having the lowest flow resistance (K) and, therefore, the lowest force required to start the flow (0). Through thermogravimetric analysis, it was verified that the microemulsified fluids obtained can operate at temperatures of up to 100 °C, making it possible to apply them in oil wells with these thermal characteristics. The cakes formed were thin and of low permeability, extremely important factors for the successful completion of a well. In addition, the filtrate volume results and the rheological parameters showed that the fluids meet Petrobras N-2604 standard, with the fluids formulated with bentonite clay presenting the lowest filtrate volumes. Thus, in view of the growing search for ecologically acceptable and low-cost drilling fluids, it can be said that the fluids formulated in this work are viable alternatives for use in oil wells.