Abstract
Water-based drilling fluids are widely used in the petroleum exploration and production stage. After this stage, the residue contains several potentially polluting compounds, especially hydrocarbons. This waste is disposed of in industrial landfills for treatment, thus raising industrial operational costs. A combination developed of the residual oil from water-based drilling fluid waste. Relevant parameters were temperature, centrifugal force and the use of synthetic and natural polymers. Results showed that an increase in centrifugal force and temperature are essential for separation of the oil phase. The use of polymers improved efficiency by completely removing the oil from the residue, around 20% v/v. The characterization of the recovered oil classified it as light oil with density at 20 °C of 0.7997 g·cm−3 and API gravity of 44.4, low sulfur content (0.0667 wt%), total acid number of 0.812 mg of KOH g−1, water content of 0.58% v/v and saturated, aromatic and polar contents of 64.11, 5.19 and 30.70 wt%, respectively. These results show that is possible to recover a viable oil that can be incorporated at the midstream stage, thus avoiding disposal and reducing operational costs and environmental impact.
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