西南石油大学学报(自然科学版) ›› 1999, Vol. 21 ›› Issue (1): 67-70.DOI: 10.3863/j.issn.1000-2634.1999.01.017

• 钻采工艺与设备 • 上一篇    下一篇

基于小波变换的井筒液气浸检测

唐斌

  

  1. 西南石油学院石油工程系,四川 南充 637001
  • 收稿日期:1997-01-07 修回日期:1900-01-01 出版日期:1999-02-20 发布日期:1999-02-20
  • 通讯作者: 唐斌

WELLBORE GAS INFLUX DETECTION BASED ON WAVELET TRANSFORM

Tang Bin
  

  1. Southwest Petroleum Inst
  • Received:1997-01-07 Revised:1900-01-01 Online:1999-02-20 Published:1999-02-20
  • Contact: Tang Bin

摘要: 分析了井筒液气浸前后井口环空内传感器接收信号的波形突变性,研究了信号突变性与小波变换的关系,提出了一种新的利用离散二进制小波变换检测井筒液气浸的方法。计算机模拟实验证实了方法的有效性。

关键词: 井筒流动, 钻井液, 气浸, 波形突变性, 小波变换

Abstract: In this paper, the signal waveform received before and after gas entering the wellbore by transducer placed below the flow return line in the annulus is analyzed. The relationship between the signal waveform suddenness and its wavelet transform is discussed. Based on the analysis of received signal wavelet transform, a novel method of gas influx detection is proposed.
The validity of the method has been verified by computer simulation.

Key words: wellbore flow, drilling fluid, gas influx, waveform suddenness, wavelet transform

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