Maria Ingrid Rocha Barbosa

Fluidos de perfuração à base de água. Parte I: efeitos de aditivações poliméricas nas propriedades reológicas

Foram estudados os efeitos da incorporacao de quatro diferentes aditivos polimericos nas propriedades reologicas e de filtracao de fluidos de perfuracao a base de agua e argilas bentoniticas de Boa Vista, PB. Os resultados mostraram que estas propriedades sao fortemente influenciadas pela presenca dos polimeros e que o tamanho da cadeia polimerica e um fator determinante.

Desenvolvimento de compósitos bentonita/polímeros para aplicação em fluidos de perfuração

The polymeric addictivation of fluids used in oil wells drilling is a common practice and among the addictives more used, is the carboximethyl cellullose (CMC) and the partially-hydrolyzed polyacrylamide (PHPA), and depending of their characteristics, carry out different functions and they are added individually. The objective of this work is study binary compositions of cellullosics and non-cellullosic polymers to development of bentonite/polymers compositions to use in water based drilling fluids. Was studied one sodic bentonite clay sample from Paraiba and three polimerics additives (low viscosity and high viscosity CMC and PHPA). The polymer mixtures was elaborated to explore the basic compositions (100%-0%; 50%-50% and 0%-100%) as initial step. The polymeric compositions in three different concentrations was mixed with dry clay and after the drilling fluids was prepared. Following 24 h fluid resting, the apparent and plastic viscosities and water loss were established according to Petrobras standards. The results evidenced that the cellullosic and non-cellullosic polymers mixture showed to be more efficient improving the rheologic and filtration properties of water based drilling fluids. This way, is able the combination of raw materials of different attributes to obtain polymeric compositions to be added on bentonitics intending the development of bentonite/polymer composite to wells drilling uses.

Compostos poliméricos como aditivos de argilas bentoníticas

The aim of this work is to evaluate the effect of polymeric compound on the treatment of bentonite clays for using in water and clay based drilling fluids for the improvement of the filtration and the rheological properties. One industrialized sodic bentonite clay sample and three polymeric additive samples, being two samples of carboximethylcellulose and one of partially-hydrolyzed polyacrylamide, were studied. The compositions of the polymeric compound were obtained through the methodology of mixture design, being defined ten different compositions. The polymeric compound with dry clay was mixed in different concentrations and the drilling fluids were prepared according to the Petrobras standards; the apparent and plastic viscosities, the yield stress and the water loss were determined. The results show that the use of additives in bentonite clays with polymeric compound improves their properties, according to the Petrobras specifications for their use in water based drilling fluids.