Numerical analysis of a combined quadrupole-dipole mode for acoustic logging-while-drilling reflection survey
- Zhou-tuo Wei (COSL-UPC Allied Borehole Acoustic Lab., China University of Petroleum (East China)) | Xiao-ming Tang (COSL-UPC Allied Borehole Acoustic Lab., China University of Petroleum (East China)) | Xue-lian Chen (COSL-UPC Allied Borehole Acoustic Lab., China University of Petroleum (East China)) | Li-wei Wang (CNPC Logging Company Limited Tianjin Branch)
- Document ID
- Society of Exploration Geophysicists
- SEG International Exposition and Annual Meeting, 15-20 September, San Antonio, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2019. Society of Exploration Geophysicists
- Borehole measurements, Borehole acoustics, Remote sensing
- 0 in the last 30 days
- 27 since 2007
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The after-drilling single-well imaging technique (SWI) has been successfully accepted by industry operators, especially the dipole SWI, it is becoming a valuable and challenging task to extend this technology into acoustic logging-while-drilling (LWD) measurement. A combined quadrupole-dipole measurement mode (CQD) is proposed to be applied in acoustic LWD for single-well imaging (SWI), which allows for the treatment of acoustical isolation, and might be easy to be made in quadrupole LWD practice. Starting from the SH and SV-wave radiations from an LWD quadrupole source and the dispersion and excitation properties of LWD quadrupole and dipole sources, we theoretically demonstrate the feasibility of the CQD in LWD SWI. Our results demonstrate that (1) the azimuth ambiguity can be eliminated by the amplitude difference of the hybrid datum, (2) a greater swing angle corresponds to high reflected wave amplitude, and (3) wave modes are characterized by the quadrupole cutoff frequency in LWD SWI.
Presentation Date: Monday, September 16, 2019
Session Start Time: 1:50 PM
Presentation Time: 2:15 PM
Location: Poster Station 4
Presentation Type: Poster
|File Size||836 KB||Number of Pages||5|
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