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TECHNICAL PAPERS

Identification for Sucker-Rod Pumping System’s Damping Coefficients Based on Chain Code Method of Pattern Recognition

[+] Author and Article Information
Hongzhao Liu1

Department of Mechanical and Precision Instrument Engineering, Xi’an University of Technology, Xi’an, 710048, People’s Republic of Chinaliuhongzhao@xaut.edu.cn

Baixi Liu

Department of Mechanical and Precision Instrument Engineering, Xi’an University of Technology, Xi’an, 710048, People’s Republic of Chinawoodboylbx@yahoo.com.cn

Daning Yuan, Jianhua Rao

Department of Mechanical and Precision Instrument Engineering, Xi’an University of Technology, Xi’an, 710048, People’s Republic of China

1

Corresponding author.

J. Vib. Acoust 129(4), 434-440 (Apr 09, 2007) (7 pages) doi:10.1115/1.2748464 History: Received January 20, 2006; Revised April 09, 2007

In this paper, a method for identifying the damping coefficients of a directional well sucker-rod pumping system is put forward by means of the chain code method of pattern recognition. The 24-directional chain code is provided to encode the dynamometer card curve. The parametric equation of the dynamometer card curve is transformed into Fourier series whose coefficients can be computed according to the curve’s chain codes. By means of these coefficients, shape characteristics of the curve are extracted. The Euclidean distance is introduced as the measurement of similar degree between the shape characteristics of measured dynamometer card and that of simulated dynamometer card. Changing the value of viscous damping coefficient and Coulomb friction coefficient in the simulation program, different simulated dynamometer cards are obtained. Substituting their shape characteristics to the Euclidean distance, respectively, a series of distances are acquired. When the distance is less than the given error, the corresponding values of the damping coefficients in the simulation program are regarded as real damping coefficients of the sucker-rod pumping system of directional well. In the end, an example is provided to show the correctness and effectiveness of the presented method.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

The 24-directional chain code

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Figure 2

Resolution of line AB and CD

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Figure 3

Reconstruction of curve

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Figure 4

Sketch of rod string

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Figure 5

Forces acting on the element

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Figure 6

Simulated dynamometer cards via different viscous and Coulomb coefficients

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Figure 7

Flowchart of identification

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Figure 8

Measured dynamometer card and the final simulated dynamometer card of well I

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Figure 9

Measured dynamometer card and the final simulated dynamometer card of well II

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