Free Pipe Effects On Guided Wave Propagation
The effects of free pipe on the pseudo-Rayleigh and Stoneley waves are studied by introducing a fluid annulus between the casing and cement layers of a cased borehole model. The existence of a fluid annulus region results in a second Stoneley mode being generated which propagates primarily in the...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Technical Report |
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Massachusetts Institute of Technology. Earth Resources Laboratory
2019
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| Online Access: | https://mit.atmire.com/handle/1721.1/121144 |
| _version_ | 1826202868271546368 |
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| author | Burns, D. R. Cheng, C. H. |
| author2 | Massachusetts Institute of Technology. Earth Resources Laboratory |
| author_facet | Massachusetts Institute of Technology. Earth Resources Laboratory Burns, D. R. Cheng, C. H. |
| author_sort | Burns, D. R. |
| collection | MIT |
| description | The effects of free pipe on the pseudo-Rayleigh and Stoneley waves are studied by introducing a fluid annulus between the casing and cement layers of a cased borehole
model. The existence of a fluid annulus region results in a second Stoneley mode being
generated which propagates primarily in the annulus. The propagation and attenuation
of this second mode are controlled by the fluid annulus, cement, and formation
properties. The primary or central Stoneley mode becomes decoupled from the effects
of formation when the free pipe situation exists, and its propagation and attenuation
are controlled by the central fluid and casing properties only. The amplitude of the
second Stoneley mode increases as the annulus thickness increases, but in most cases
is an order of magnitude less than the primary mode amplitude. The pseudo-Rayleigh
wave becomes more dispersive as the annulus region increases in thickness. |
| first_indexed | 2024-09-23T12:23:09Z |
| format | Technical Report |
| id | mit-1721.1/121144 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T12:23:09Z |
| publishDate | 2019 |
| publisher | Massachusetts Institute of Technology. Earth Resources Laboratory |
| record_format | dspace |
| spelling | mit-1721.1/1211442019-04-11T07:12:34Z Free Pipe Effects On Guided Wave Propagation Burns, D. R. Cheng, C. H. Massachusetts Institute of Technology. Earth Resources Laboratory Burns, D. R. Cheng, C. H. The effects of free pipe on the pseudo-Rayleigh and Stoneley waves are studied by introducing a fluid annulus between the casing and cement layers of a cased borehole model. The existence of a fluid annulus region results in a second Stoneley mode being generated which propagates primarily in the annulus. The propagation and attenuation of this second mode are controlled by the fluid annulus, cement, and formation properties. The primary or central Stoneley mode becomes decoupled from the effects of formation when the free pipe situation exists, and its propagation and attenuation are controlled by the central fluid and casing properties only. The amplitude of the second Stoneley mode increases as the annulus thickness increases, but in most cases is an order of magnitude less than the primary mode amplitude. The pseudo-Rayleigh wave becomes more dispersive as the annulus region increases in thickness. Massachusetts Institute of Technology. Full Waveform Acoustic Logging Consortium 2019-04-04T10:09:02Z 2019-04-04T10:09:02Z 1986 Technical Report https://mit.atmire.com/handle/1721.1/121144 Earth Resources Laboratory Industry Consortia Annual Report;1986-03 application/pdf Massachusetts Institute of Technology. Earth Resources Laboratory |
| spellingShingle | Burns, D. R. Cheng, C. H. Free Pipe Effects On Guided Wave Propagation |
| title | Free Pipe Effects On Guided Wave Propagation |
| title_full | Free Pipe Effects On Guided Wave Propagation |
| title_fullStr | Free Pipe Effects On Guided Wave Propagation |
| title_full_unstemmed | Free Pipe Effects On Guided Wave Propagation |
| title_short | Free Pipe Effects On Guided Wave Propagation |
| title_sort | free pipe effects on guided wave propagation |
| url | https://mit.atmire.com/handle/1721.1/121144 |
| work_keys_str_mv | AT burnsdr freepipeeffectsonguidedwavepropagation AT chengch freepipeeffectsonguidedwavepropagation |