SILVA, C. H.; http://lattes.cnpq.br/0211801065470142; SILVA, Cristiane Henrique da.
Résumé:
This work presents a study about the influence of the incorporation of bentonite
clay and carbonate calcium in n-paraffin synthetic drilling fluids properties.
Thus, the research uses bentonite clay with particle size of 45 µm and 75 µm,
besides calcium carbonate with particle sizes in the ranges of 2-44 µm and
2-74 µm to simulate the effects of the solid incorporation. The analysis of the
influence of such contaminants is performed in the concentrations of 5%, 10%
and 15% of the volume of the fluid sample (350 mL) considered by mass. To
study the influence of these contaminants the density, electrical stability,
electrical resistivity, flow behavior, plastic viscosity, apparent viscosity, yield
point, gel strength, and volume filtered properties of the n-paraffin synthetic
fluids are measured in laboratory. In addition to these tests, the characterization
of contaminants through granulometric analysis and contact angle test is also
performed. The results show that the type of solid contaminant exerts different
influence on the fluids properties. The bentonite clay is responsible for the
greatest effect on the rheological properties and the volume of the filtrated,
while the calcium carbonate is more influent on the density and electrical
stability. However, globally the bentonite clay exerts greater influence on the all
properties. Finer particles cause greater effect on the studied properties. With
respect to the concentration of contaminants is observed that the volume of
filtrated is the property that suffers the greatest effect. However, the increase or
decrease of one or other property does not occur linearly with respect to
increasing the amount of contaminant.
