Volume 46 Issue 3
May  2018
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GUO Xianwei, RU Dajun, WANG Haiyan, YANG Chun, LIU Zhixuan, HAO Nan. Cause Analysis on Abnormal Pulse Signals of BH-VDT Vertical Drilling Tool[J]. Petroleum Drilling Techniques, 2018, 46(3): 59-64. DOI: 10.11911/syztjs.2018044
Citation: GUO Xianwei, RU Dajun, WANG Haiyan, YANG Chun, LIU Zhixuan, HAO Nan. Cause Analysis on Abnormal Pulse Signals of BH-VDT Vertical Drilling Tool[J]. Petroleum Drilling Techniques, 2018, 46(3): 59-64. DOI: 10.11911/syztjs.2018044
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Cause Analysis on Abnormal Pulse Signals of BH-VDT Vertical Drilling Tool

  • Engineering Technology Institute, CNPC Bohai Drilling Engineering Company Limited, Tianjin, 300457, China

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  • Received Date: July 16, 2017
  • Revised Date: March 17, 2018
    Graphical Abstract
    • Abstract
  • In order to analyze the causes of the abnormal pulse signals sent by the BH-VDT vertical drilling tool when drilling in complicated formations,and to provide the basis for eliminating abnormal pulse signals,by means of laboratory simulation test,the waveforms of normal pulse signals and abnormal pulse signals caused by instantaneous disconnection and underpower were simulated;and the characteristics of such waveforms were analyzed.The results were as follows:the waveforms of abnormal pulse signals caused by instantaneous disconnection showed the characteristics of randomness and diversity,and when the breakpoint appeared in the non-emitted pulse waveband,the amplitude of the waveform was not influenced.The waveforms of abnormal pulse signals caused by underpower showed the characteristics of periodicity and sustainability,and when the breakpoint appeared during the pulse emission,the waveform amplitude was significantly reduced.The causes of abnormal pulse signals could be determined by comparing the characteristics of the waveforms of field acquired abnormal pulse signals with that of the laboratory simulated ones.The applications showed that the causes of abnormal pulse signals could be accurately determined through analyzing the characteristics of the waveforms of field-acquired abnormal pulse signals and comparing them with those of the simulated ones,thus providing a basis for eliminating abnormal pulse signals.
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    • References (6)
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