Electrical Treatment of Waxy Crude Oil To Improve Its Cold Flowability

We demonstrate that the cold flowability of the waxy crude oil can be significantly improved via electrical treatment. A novel apparatus was assembled to electrically treat the waxy crude oil while simultaneously measuring its rheological properties. A method was developed to calculate the oil’s viscosity by using non-Newtonian fluid mechanics and rheological principles. Lower treatment temperatures, higher electric field strengths, and lower shear rates provided greater viscosity reduction. Notably, a viscosity reduction of 70% was obtained when the oil was electrically treated near its pour point for 90 s. Microscopic examinations indicate that the broader size distribution of wax particles in the treated oil might be responsible for the observed viscosity reduction. Besides, the energy consumption of the electrical treatment was estimated to be less than 1% of that of the conventional heating method to achieve the same viscosity reduction performance.