Abstract
Abstract The formation of stable water in oil emulsions in crude oil production is caused by the presence of resins and asphaltene which can organize and form rigid films at oil/water interface. In the demulsification process, demulsifier is considered to produce changes in interface rheological properties. This is because demulsification involves displacement of natural surfactants, such as asphaltenes and resins from the film surrounding the water drop. In this research, demulsifier effect and pH variation were evaluated considering the rheological behaviour of crude oil water/interface, and a model system of 1% aphalthene in heptol. Interface viscoelastic properties were studied by a planar rheological method using a surface rheometer at low shearing stress. Results indicate that measurements of creep compliance with pH variation show viscoelastic behaviour for both systems. pH effect on rheological parameters is evident, and elasticity and viscosity notoriously change. Demulsifier effect is noticeable in the different concentration evaluated. Also, it was found that elasticity changes with demulsifier concentration. This is an indicator that demulsifier works to destabilise the interface.
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