Influência da temperatura e pressão no desempenho de fluidos de perfuração à base de água.

Abstract

The aim of this study is to evaluate the influence of temperature and pressure on rheological, filtration and lubricity properties of the water based drilling fluids. Eight formulations were selected from preliminary studies conducted by Farias (2008). The fluids were prepared according to the field practice that is to add the additives to the water one by one under constant agitation. After 16h of aging in a roller over in temperatures of 100°F (37,8°C), 150°F (65,6°C) e 200°F (93,3°C), the study of rheological behavior and filtration and lubricity properties were determined. The results show that with aging the fluids, there are a reduction in the values of apparent and plastic viscosities and the field limit, and a large increase in values of the water loss and significant reductions in values of lubricity coefficient when compared with the fluid environment temperature.