Measurement of Vertical Oil-in-water Two-phase Flow Using Dual-modality ERT-EMF System

Yousef Faraj, Mi Wang, Jiabin Jia, Qiang Wang, Cheng-gang Xie, Gary Oddie, Ken Primrose , Changhua Qiu

Research output: Contribution to journalArticlepeer-review


Oil-in-water two-phase flows are often encountered in the upstream petroleum industry. The measurement of phase flow rates is of particular importance for managing oil production and water disposal and/or water reinjection. The complexity of oil-in-water flow structures creates a challenge to flow measurement. This paper proposes a new method of two-phase flow metering, which is based on the use of dual-modality system and multidimensional data fusion. The Electrical Resistance Tomography system (ERT) is used in combination with a commercial off-the-shelf Electromagnetic Flow meter (EMF) to measure the volumetric flow rate of each constituent phase. The water flow rate is determined from the EMF with an input of the mean oil-fraction measured by the ERT. The dispersed oil-phase flow rate is determined from the mean oil-fraction and the mean oil velocity measured by the ERT cross-correlation velocity profiling. Experiments were carried out on a vertical upward oil-in-water pipe flow, 50 mm inner-diameter test section, at different total liquid flow rates covering the range of 8-16 m3/hr. The oil and water flow rate measurements obtained from the ERT and the EMF are compared to their respective references. The accuracy of these measurements is discussed and the capability of the measurement system is assessed.
Original languageEnglish
Pages (from-to)255–261
JournalFlow Measurement and Instrumentation
Issue numberPart B
Early online date21 Sep 2015
Publication statusPublished - Dec 2015


  • Keywords Electrical Resistance Tomography
  • Electromagnetic Flow meter
  • Dual-modality measurement system
  • Two-phase flow metering
  • Oil-in-water flow
  • Vertical upward flow


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