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 • Previous Articles     Next Articles

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

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

CLC Number: