Effects of high-frequency and high-voltage pulsed electric field parameters on water chain formation |
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| Institution: | 1. College of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, Shandong, China;2. Fengcheng Field Operation District, Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;1. Institute of Particle Science and Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom;2. Faculty of Caspian, College of Engineering, University of Tehran, 11365-4563 Tehran, Iran;1. College of Pipeline & Civil Engineering, China University of Petroleum, Qingdao 266555, Shandong, China;2. Sinopec Petroleum Engineering Corporation, Dongying 257026, Shandong, China;1. School of Mechanical Engineering, Chongqing University of Technology, Chongqing 400054, China;2. School of Mechanical and Electronical Engineering, Lanzhou University of Technology, Lanzhou 730050, China;3. Engineering Research Centre for Waster Oil Recovery Technology and Equipment, Chongqing 400067, China;1. School of Mechanical Engineering, Chongqing University of Technology, Chongqing 400054, China;2. School of Mechanical and Electronical Engineering, Lanzhou University of Technology, Lanzhou 730050, China;3. Engineering Research Centre for Waster Oil Recovery Technology and Equipment, Chongqing 400067, China;1. State Key Laboratory of Heavy Oil, China University of Petroleum (East China), Qingdao 266580, Shandong, China;2. Institute of Particle Science and Engineering, University of Leeds, School of Chemical and Process Engineering, Leeds LS2 9JT, UK |
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| Abstract: | Separation methods utilizing high-frequency and high-voltage pulsed DC electric fields have been used extensively in the oil and petroleum industries, where the occurrence of water-in-oil dispersions is highly unwelcome because of physical constraints and the high maintenance costs required to treat these dispersions. This paper reports the results of studies of the effects of applied electric field parameters, including electric field strength, frequency, and duty ratio, on water chain formation in water-in-oil emulsions. The investigations were performed in a rectangular Perspex® cell. The results of the studies show that dipole–dipole forces dominate the process of water chain formation. At low electric field strength, frequency, or duty ratio, dipole–dipole forces are negligible; therefore, the process of water chain formation and aqueous drop coalescence are inconspicuous. However, at high electric field strength, frequency, or duty ratio, significant dipole–dipole forces give rise to water chain formation and aqueous drop coalescence. At extremely high electric field strength, frequency, or duty ratio, aqueous drops are excessively polarized and disintegrate, inhibiting the processes of water chain formation and aqueous drop coalescence. The optimum electric field parameters for separation of water-in-oil dispersions are as follows: electric field strength, 3.80 kV cm−1; frequency, 4.0 kHz; and duty ratio, 0.65. |
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| Keywords: | High frequency impulse W/O emulsions Electric field parameters Water chain length Particle size |
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