吉林大学学报(工学版) ›› 2015, Vol. 45 ›› Issue (1): 153-160.doi: 10.13229/j.cnki.jdxbgxb201501023

• Orignal Article • Previous Articles     Next Articles

Design and implementation of multi-channel borehole-surface potential gradient detection system

JIA Zheng-sen1,2, LIN Jun1,2, ZHU Kai-guang1,2, WANG Jia1,2, LI Xue-tao1,2   

  1. 1.National Geophysical Exploration Instrument Engineering Technology Research Center, Jilin University,Changchun 130026, China;
    2.College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130026, China
  • Received:2013-05-03 Online:2015-02-01 Published:2015-02-01

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Abstract: Theoretical calculations are carried out based on a vertical line source 3D abnormal potential of finite difference to verify the effectiveness of potential gradient in the detection of water injection direction. Then, a low-noise, high-resolution oil borehole-surface potential gradient detection system is designed and developed based on virtual instrument technology. The system applies a differential input. The short circuit noise amplitude is lower than -130 dB. The A/D acquisition, which adopts the expansion slot design ideas, realizes the synchronization of multi-channel data acquisition. The upper layer software consists of Matlab and Labview programming techniques, thus the extraction of weak signals and real-time imaging of detection results can be achieved. Experiments show that the potential gradient detection system has higher resolution and good stability compared to the potential detection system. By processing and analyzing the experimental data obtained from the injection wells in Daqing oilfield, it can locate the cutting-edge of water drive. Furthermore, the injection well data prove the accuracy and effectiveness of the system in detecting the water injection direction.

Key words: technology of instrument and meter, borehole-surface potential gradient, residual oil, finite differences, Labview, multi-channel

CLC Number: 

  • TH762
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