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Higher Order Modes in Acoustic Logging While Drilling

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dc.contributor.author Chi, Shihong
dc.contributor.author Zhu, Zhenya
dc.contributor.author Rao, Rama V. N.
dc.contributor.author Toksoz, M. Nafi
dc.contributor.other Massachusetts Institute of Technology. Earth Resources Laboratory en_US
dc.date.accessioned 2011-12-22T18:48:57Z
dc.date.available 2011-12-22T18:48:57Z
dc.date.issued 2005
dc.identifier.uri http://hdl.handle.net/1721.1/67876
dc.description.abstract In multipole acoustic logging while drilling (LWD), the fundamental modes dominate recorded waveforms. Higher order modes may also appear and complicate the processing of LWD data. In dipole LWD measurements, the dipole tool mode is often not well separated from the flexural mode. This makes the shear wave measurement more difficult. We conducted theoretical and numerical analysis on dipole LWD logging responses. We found that hexapole mode may be present in the dipole waveforms. Laboratory dipole data show the presence of hexapole mode, which approaches asymptotically to the formation shear wave velocity. This observation supports our conclusion. We may make use of these higher order modes for accurate determination of formation shear wave velocity. en_US
dc.description.sponsorship Massachusetts Institute of Technology. Borehole Acoustics and Logging Consortium en_US
dc.description.sponsorship Massachusetts Institute of Technology. Earth Resources Laboratory en_US
dc.publisher Massachusetts Institute of Technology. Earth Resources Laboratory en_US
dc.relation.ispartofseries Earth Resources Laboratory Industry Consortia Annual Report;2005-05
dc.title Higher Order Modes in Acoustic Logging While Drilling en_US
dc.type Technical Report en_US
dc.contributor.mitauthor Chi, Shihong
dc.contributor.mitauthor Zhu, Zhenya
dc.contributor.mitauthor Rao, Rama V. N.
dc.contributor.mitauthor Toksoz, M. Nafi
dspace.orderedauthors Chi, Shihong; Zhu, Zhenya; Rao, Rama V. N.; Toksoz, M. Nafi en_US


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