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Journal of Applied Sciences

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Analyzing Monitoring Efficiency of Sucker-Rod Pumping Unit with Empirical Mode Decomposition

YUAN Da-ning1, ZHANG Hai-feng1, LIU Hong-zhao1, RAO Jian-hua2   

  1. 1. Department of Mechanical and Precision Instrument Engineering, Xi’an University of Technology, Xi’an 710048, China;
    2. Department of Mechanical and Electronic Engineering, China University of Geosciences, Wuhan 430074, China
  • Received:2006-12-19 Revised:2007-04-11 Online:2007-07-30 Published:2007-07-30

Abstract: In evaluating the sucker-rod pumping performance of an oil well, the measured signal is inevitably contaminated by instrument errors and disturbances of various environment effects. As a result, the system efficiency obtained from the original monitoring signal cannot be used directly for analyzing the system efficiency. To deal with this problem, comparison is made between the empirical mode decomposition (EMD) and the wavelet method in terms of signal trend extraction. The EMD method has been found to be better, and used in analyzing the monitoring signal of sucker-rod pumping unit. The variation trend of system efficiency of the oil well is obtained. Numerical simulations show that EMD is an accurate, simple, and efficient method for extracting trend of monitoring signal of the oil well.

Key words: oil well, system efficiency, variation trend, empirical mode decomposition (EMD)