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Effects of tool eccentricity on wave dispersion properties in borehole acoustic logging while drilling

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dc.contributor.author Zheng, Yibing
dc.contributor.author Toksoz, M. Nafi
dc.contributor.other Massachusetts Institute of Technology. Earth Resources Laboratory en_US
dc.date.accessioned 2012-01-20T18:42:14Z
dc.date.available 2012-01-20T18:42:14Z
dc.date.issued 2004
dc.identifier.uri http://hdl.handle.net/1721.1/68621
dc.description.abstract In this paper, a finite element approach is applied to study the dispersion properties of non-leaky acoustic waves inside boreholes with off-centered LWD (logging while drilling) tools. Both soft and hard formation cases are studied with focus on phase velocity dispersions of Stoneley, dipole and quadrupole modes. When an LWD tool is off-centered, the dispersion curve of the Stoneley mode shifts to the lower phase velocity compared with that of a centered-tool condition. Meanwhile, the dipole dispersion curve splits into two curves with different phase velocities. This splitting phenomenon is also observed with the quadrupole mode. The splitting and shifting of the dipole mode are greater than those of the quadrupole mode. These new observations are important for interpreting acoustic LWD data accurately. en_US
dc.description.sponsorship Massachusetts Institute of Technology. Earth Resources Laboratory en_US
dc.description.sponsorship Massachusetts Institute of Technology. Borehole Acoustics and Logging Consortium en_US
dc.publisher Massachusetts Institute of Technology. Earth Resources Laboratory en_US
dc.relation.ispartofseries Earth Resources Laboratory Industry Consortia Annual Report;2004-10
dc.title Effects of tool eccentricity on wave dispersion properties in borehole acoustic logging while drilling en_US
dc.type Technical Report en_US
dc.contributor.mitauthor Zheng, Yibing
dc.contributor.mitauthor Toksoz, M. Nafi
dspace.orderedauthors Zheng, Yibing; Toksoz, M. Nafi en_US


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