Feasibility analysis of drill bit tracking using seismic while drilling technique

Baichun Sun; Binzhong Zhou; Andrej Bona; Roman Pevzner

doi:10.1071/ASEG2012ab203

ISSN: 2202-0586
E-ISSN:

oa Feasibility analysis of drill bit tracking using seismic while drilling technique
Authors Baichun Sun^a, Binzhong Zhou^b, Andrej Bona^c and Roman Pevzner^d
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^a Curtin University, Perth, , Western Australia, [email protected] ^b CSIRO, Brisbane, , Queensland, [email protected] ^c Curtin University, Perth, , Western Australia, [email protected] ^d Curtin University, Perth, , Western Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2012, Issue ASEG2012 - 22nd Geophysical Conference, Dec 2012, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2012ab203
- Published online: 01 Dec 2012

Abstract

Summary

Check-shot survey measures the first arrival time with a known depth receiver in borehole to assess formation velocity. This information can be used in correlation with sonic log and surface seismic products for adjustment of interpretation. Check-shot survey can also be implemented with seismic-while-drilling using drill bit noise as the source. This differs from usual check-shot survey as source is in the borehole. It provides a real time, cost saving, and safe measurement.

Check-shot survey needs a known receiver depth, thus velocity can be obtained by fixed wave travel path and the measured first arrival time. However, in seismicwhile-drilling (SWD), drill bit position can vary a lot from vertical drilling to deviated drilling. To address this issue, we present a method that finds the location of the source and estimates the velocity of the formation at the same time. Using a synthetic model, with medium receiver offsets, this method shows good estimation of the drill bit depth location and formation velocity in a layered Earth model.

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2012-12-01

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References

Bona, A., 2011, Shot-gather time migration of planar reflectors without velocity model. Geophysics 76(2): S93-S101.
Claerbout, J.F., 2010. Baisc Earth Imaging, from http://sepwww.stanford.edu/sep/prof/
Donatoni, M., 2011, Offshore drilling, http://cseserv.engr.scu.edu/StudentWebPages/MDonatoni/ResearchPaper.htm.
Miranda, F., Aleotti, L., Abramo, F., Poletto, F., Craglietto, A., Persoglia, S., and Rocca, F., 1996. Imapct of seismic 'while drilling' technique on exploration wells, First break, 14. 56 – 68.
Poletto, F., and Miranda, F., 2004. Seismic While Drilling Fundamental of drill-bit seismic for exploration, 1st edn, Vol. 35, Elsvier, Italy.
Underhill, W., Esmersoy, C., Hauthorn, A., Hashem, M., Hendrickson, J., and Scheibel, J., 2001. Demonstrations of Real-Time Borehole Seismic From an LWD Tool, SPE annual technical conference and exibition, 71365-MS.
Wei, W., Booth, D., Liu, Y., and Li, X., 2006. The application of two-parameter velocity and slowness functions in approximating seimic reflection travel time, Journal of geophysics and engineering, 3, 271-282.

/content/journals/10.1071/ASEG2012ab203

Article Type: Research Article

Keyword(s): check-shot; seismic-while-drilling; slowness

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