New composition for demulsification in downhole conditions

Based on laboratory experiments on destruction of oil emulsions of various fields a new effective composition of demulsifier has been developed. The article investigates the demulsifying and inhibiting properties of the new composition for breaking oil emulsions. The known technologies were studied, and numerous experiments were carried out to investigate the new composition. The requirement of low density of components was fulfilled, which is an important property of the obtained composition, high demulsification at low consumption of the composition was achieved, and high inhibitory properties of this composition regarding well equipment were provided. The composition based on homogeneous mixture of polyethylene polyamine with rosin and methanol has low cost, is characterised by simplicity and ease of preparation. The proposed composition differs from many known demulsifiers by simplicity of preparation in field conditions, high efficiency. The developed composition provides sufficiently high results even at a small consumption compared to known demulsifiers, while its price is much cheaper. The proposed composition can also be used as a corrosion inhibitor. Economic efficiency of the proposed composition is achieved by reducing the concentration from 150 mg/l according to the prototype to 100 mg/l. In addition, the composition is easily prepared in field conditions, including offshore oil fields, and is also characterised by high inhibiting properties. When 0.1% of rosin is added to methanol, the inhibiting ability of methanol increases 5 times, i.e. it allows the composition to be used as a corrosion inhibitor in an aggressive environment with the presence of hydrogen sulphide. Keywords: oil-water emulsion; demulsification; well; composition; rosin; methanol.