Acoustic Logging While Drilling (LWD): Experimental Studies with Anisotropic Models
A model LWD tool (0.16" ID, 0.4" OD) was built to investigate its operation in an anisotropic formation. The tool consists of a dipole source and six dipole receivers capable of operating at several hundred kHz. The formation was a block of delabole slate with a borehole of 1.27 cm diam...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Technical Report |
| Published: |
Massachusetts Institute of Technology. Earth Resources Laboratory
2011
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| Online Access: | http://hdl.handle.net/1721.1/67853 |
| _version_ | 1826202840819826688 |
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| author | Rao, Rama V. N. Zhu, Zheny Burns, Daniel R. Toksoz, M. Nafi |
| author2 | Massachusetts Institute of Technology. Earth Resources Laboratory |
| author_facet | Massachusetts Institute of Technology. Earth Resources Laboratory Rao, Rama V. N. Zhu, Zheny Burns, Daniel R. Toksoz, M. Nafi |
| author_sort | Rao, Rama V. N. |
| collection | MIT |
| description | A model LWD tool (0.16" ID, 0.4" OD) was built to investigate its operation in
an anisotropic formation. The tool consists of a dipole source and six dipole receivers
capable of operating at several hundred kHz. The formation was a block of delabole
slate with a borehole of 1.27 cm diameter.
In an anisotropic °uid-¯lled borehole with a dipole source and dipole receiver ori-
ented along the principal directions, dipole (°exural) modes are mainly observed. Weak
compression and shear refracted arrivals are also discernable when they were not ob-
scured by stronger arrivals. Further, modes corresponding to fast shear direction are
evident in the slow shear direction measurement.
With a model LWD tool in the °uid-¯lled borehole, and oriented in the fast and
slow directions, the main arrivals were the corresponding °exural modes. Modes cor-
responding to the fast shear direction are no longer evident in the slow shear direction
measurments. These preliminary experiments suggest that, with an LWD tool in an
anisotropic formation, arrivals sensitive to formation properties can be discerned. |
| first_indexed | 2024-09-23T12:21:25Z |
| format | Technical Report |
| id | mit-1721.1/67853 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T12:21:25Z |
| publishDate | 2011 |
| publisher | Massachusetts Institute of Technology. Earth Resources Laboratory |
| record_format | dspace |
| spelling | mit-1721.1/678532019-04-12T15:05:23Z Acoustic Logging While Drilling (LWD): Experimental Studies with Anisotropic Models Rao, Rama V. N. Zhu, Zheny Burns, Daniel R. Toksoz, M. Nafi Massachusetts Institute of Technology. Earth Resources Laboratory Rao, Rama V. N. Zhu, Zheny Burns, Daniel R. Toksoz, M. Nafi A model LWD tool (0.16" ID, 0.4" OD) was built to investigate its operation in an anisotropic formation. The tool consists of a dipole source and six dipole receivers capable of operating at several hundred kHz. The formation was a block of delabole slate with a borehole of 1.27 cm diameter. In an anisotropic °uid-¯lled borehole with a dipole source and dipole receiver ori- ented along the principal directions, dipole (°exural) modes are mainly observed. Weak compression and shear refracted arrivals are also discernable when they were not ob- scured by stronger arrivals. Further, modes corresponding to fast shear direction are evident in the slow shear direction measurement. With a model LWD tool in the °uid-¯lled borehole, and oriented in the fast and slow directions, the main arrivals were the corresponding °exural modes. Modes cor- responding to the fast shear direction are no longer evident in the slow shear direction measurments. These preliminary experiments suggest that, with an LWD tool in an anisotropic formation, arrivals sensitive to formation properties can be discerned. United States. Dept. of Energy (Grant DE-FG02-00ER15041) Massachusetts Institute of Technology. Borehole Acoustics and Logging Consortium 2011-12-21T20:51:07Z 2011-12-21T20:51:07Z 2002 Technical Report http://hdl.handle.net/1721.1/67853 Earth Resources Laboratory Industry Consortia Annual Report;2002-02 application/pdf Massachusetts Institute of Technology. Earth Resources Laboratory |
| spellingShingle | Rao, Rama V. N. Zhu, Zheny Burns, Daniel R. Toksoz, M. Nafi Acoustic Logging While Drilling (LWD): Experimental Studies with Anisotropic Models |
| title | Acoustic Logging While Drilling (LWD): Experimental Studies with Anisotropic Models |
| title_full | Acoustic Logging While Drilling (LWD): Experimental Studies with Anisotropic Models |
| title_fullStr | Acoustic Logging While Drilling (LWD): Experimental Studies with Anisotropic Models |
| title_full_unstemmed | Acoustic Logging While Drilling (LWD): Experimental Studies with Anisotropic Models |
| title_short | Acoustic Logging While Drilling (LWD): Experimental Studies with Anisotropic Models |
| title_sort | acoustic logging while drilling lwd experimental studies with anisotropic models |
| url | http://hdl.handle.net/1721.1/67853 |
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