Study on the Measurement System of Volume Fraction and Axial Velocity in Upward Vertical Pipe of Oil-water Two-phase Flow
With the six-electrode probe,a two-phase flow measurement system was designed for oil well logging.The whole system consists of the excitation signal generating circuit, the signal conditioning circuit,the data sampling &processing circuit.This apparatus can run into oil production well and interface to a PC on the ground via RS485 bus.Hybrid processor MC56F8323 was the control center of the proposed system.It sampled the up-stream and down-stream fluid flowing signals and cross-correlated in frequency-domain for axial velocity measurement.Simultaneously,MC56F8323 sampled the distributed information of oil-water two-phase flow and estimated the normalized conductivity which is a function of water volume fraction.Especially,the probe was excited by the bidirectional pulse constant-current source,and the traditional complex AC circuit such as demodulation wasn t required,so the circuit simplified and the measurement accuracy improved.The experiments,which were performed in vertical upward oil-water two-phase flow loop,indicate that the measurement error of water volume fraction is ±3％when the flowrate of oil-water mixture exceeds 10m 3 /d,and the flow axial velocity can resolve the flowrate difference with 2m 3 /d.
oil-water two-phase flow water volume fraction flow axial velocity the bidirectional pulse constant-current source hybrid processor
Kong Lingfu Li Yingwei Liu Xingbin Hu Jinhai
College of Information Science and Engineering,Yanshan university,Qinhuangdao 066004 China Logging&Testing Services Company of Daqing Oilfield Co.LTD,DaQing,163100 China
国际会议
西安
英文
2007-08-16（万方平台首次上网日期，不代表论文的发表时间）