Models In LWD Applications
Name
1999.5 Rao et al.pdf
Size
4.61 MB
Format
Adobe PDF
Checksum (MD5)
a5ad53d6687788e070ed90b668faccdf
Author(s)
Rao, V. N. Rama
Burns, Daniel R.
Toksoz, M. Nafi
Date Issued
1999
Publisher
Massachusetts Institute of Technology. Earth Resources Laboratory
Series/Report no.
Earth Resources Laboratory Industry Consortia Annual Report;1999-05
Abstract
A model for a fluid-filled borehole with an LWD tool is used to identify and analyze the
monopole, dipole, and quadrupole modes that are present. The modes can be classified
into three groups and have dispersion behavior that is influenced predominantly by
the geometry and material properties of the three borehole layers (inner fluid column,
tool, and annulus fluid column). However, this simple dependence gets complicated
in regions of the frequency-wavenumber plane, where modes related to different layers
interact and exchange their dispersion characteristics. The dipole modes exhibit the
effects of interaction below 2 kHz and above 20 kHz.
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