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Numerical modeling of the signal transmission by cables and electromagnetic coupling for logging while drilling

Zhu Ke-Bin Nie Zai-Ping Sun Xiang-Yang

Numerical modeling of the signal transmission by cables and electromagnetic coupling for logging while drilling

Zhu Ke-Bin, Nie Zai-Ping, Sun Xiang-Yang
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  • Abstract views:  801
  • PDF Downloads:  677
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  • Received Date:  12 March 2012
  • Accepted Date:  19 October 2012
  • Published Online:  20 March 2013

Numerical modeling of the signal transmission by cables and electromagnetic coupling for logging while drilling

  • 1. School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China
Fund Project:  Project supported by the Key Program of the National Natural Science Foundation of China (Grant Nos. 60931004, 61231001), the Fundamental Research Funds for the Central Universities of Ministry of Education of China (Grant No. ZYGX2010J024).

Abstract: Lack of efficiency in transmitting logging signals has long been one of the crucial problems for the development of logging while drilling. This study aims to address this issue by using the advanced scheme for logging while drilling signal transmission, proposed by NovatekTM. The main points of the study focus on electromagnetic coupling between two adjacent pipes and the signal transmission in coaxial cables imbedded in drilling pipes. According to the axial symmetry of the electromagnetic coupling structure, the numerical mode matching is used to establish the numerical model for it. Through simulation analysis which is based on the numerical modeling of the electromagnetic coupling structure, we analyze how various parameters of the structure influence the coupling, obtain some significant conclusions, and optimize the coupling structure. The conclusions can be used to guide optimization design of coupling structure between the drill-pipe for signal transmission in logging while drilling. In addition, the rectangular transmission line whose characteristic impedance is 50 Ω is designed for the cable imbedded in the drill pipe, and the attenuation is calculated. Finally, simulation and experiment are performed for one unit of the pipeline. The results are in agreement with each other, thereby showing the good transmission performance.

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