Uso das argilas bentoníticas de Pedra Lavrada, PB, em fluidos de perfuração e bases orgânicas.

Abstract

The bentonitics they were an essential input to the preparation of drilling fluids. New deposits were found in the municipalities of Cubati Stone Drafted and Quiet, PB, which may represent an interesting alternative technology to future shortages of bentonite clays Boa Vista, PB, expansion of mineral production in the region and consolidation of the state as the largest producer the country. In addition, few studies are found relating to the modification of clays with nonionic surfactants, which bring improvements in thermal and chemical properties of organoclays. It is therefore proposed in this work, a detailed study of the use of bentonite clays Drawn Stone, PB, natural and modified with nonionic surfactants in water based drilling fluids and oil-based, respectively, and study its swelling in different organic bases. For a better understanding, this is divided into three parts, Part I the use of natural bentonite clays in water-based drilling fluids, Part II with the evaluation of the affinity between the organoclay and different organic media through its swelling and the Part III with the choice of the best organic media for use in oil-based drilling fluids. Parts I and III were based on the standards of Petrobras. The process organophilization is evaluated by the results of X-ray diffraction and thermogravimetric analysis, linking the influence of non-ionic surfactants to the results of swelling and apparent and plastic viscosities of organoclays. The results of Part I show that the clays have no promising features for water based fluids, may have its Theological properties improved with the addition of industrial additives, studies in the area. After organophilization is observed effective incorporation of nonionic surfactants in organoclays, being able to quantify the concentration of free surfactants and incorporated. In Part II, the best results are swelling with organic media diesel and kerosene, demonstrating its chemical compatibility with the organoclays. The results of rheology, part III, point out that some samples showed potential for use as viscosity mineral based drilling fluids organic.