Cement Bond Evaluation Using Early Refracted Arrivals
The cement bond evaluation tool is a device used to examine the integrity of cement bonding to the casing. A conceptual tool operating between 80-200 kHz is considered here, with a transmitter and two receivers, oriented parallel to the axis of the borehole and next to the casing. The compression...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Technical Report |
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Massachusetts Institute of Technology. Earth Resources Laboratory
2012
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| Online Access: | http://hdl.handle.net/1721.1/75349 |
| _version_ | 1811076533712846848 |
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| author | Rao, Rama V.N. Mandal, Batakrishna Cheng, Arthur C. H. Toksoz, M. Nafi |
| author2 | Massachusetts Institute of Technology. Earth Resources Laboratory |
| author_facet | Massachusetts Institute of Technology. Earth Resources Laboratory Rao, Rama V.N. Mandal, Batakrishna Cheng, Arthur C. H. Toksoz, M. Nafi |
| author_sort | Rao, Rama V.N. |
| collection | MIT |
| description | The cement bond evaluation tool is a device used to examine the integrity of cement
bonding to the casing. A conceptual tool operating between 80-200 kHz is considered
here, with a transmitter and two receivers, oriented parallel to the axis of the borehole
and next to the casing. The compressional head wave in the casing, excited by
the transmitter, will be the first arrival to be measured by the two receivers in most
situations. With both receivers on the same side of the transmitter, the attenuation of
this wave in traveling between the two receivers is dependent on the properties of the
medium immediately outside the casing. The radially layered borehole was modeled as a
layered plane medium for large operating frequency. A spectral integral approach (complete wave synthesis) was used to compute the response at the receiver locations, which then provided attenuations. Different parameters, such as transducer separation (1-12 in), annulus thickness (0-6 in), annulus impedance (free pipe to good cement), casing thickness (0.25-0.45 in), standoff distance (0.5-1 in) and source frequency (80-200 kHz) were varied in the evaluation of the operation of the tool. The parameter studies based on the theoretical computations revealed that free pipe could be distinguished from the presence of cement in a variety of situations. Additionally, lower bounds on receiver separations are given for reliable operation of the tool. |
| first_indexed | 2024-09-23T10:23:42Z |
| format | Technical Report |
| id | mit-1721.1/75349 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T10:23:42Z |
| publishDate | 2012 |
| publisher | Massachusetts Institute of Technology. Earth Resources Laboratory |
| record_format | dspace |
| spelling | mit-1721.1/753492019-04-12T20:32:18Z Cement Bond Evaluation Using Early Refracted Arrivals Rao, Rama V.N. Mandal, Batakrishna Cheng, Arthur C. H. Toksoz, M. Nafi Massachusetts Institute of Technology. Earth Resources Laboratory Rao, Rama V.N. Cheng, Arthur C. H. Toksoz, M. Nafi The cement bond evaluation tool is a device used to examine the integrity of cement bonding to the casing. A conceptual tool operating between 80-200 kHz is considered here, with a transmitter and two receivers, oriented parallel to the axis of the borehole and next to the casing. The compressional head wave in the casing, excited by the transmitter, will be the first arrival to be measured by the two receivers in most situations. With both receivers on the same side of the transmitter, the attenuation of this wave in traveling between the two receivers is dependent on the properties of the medium immediately outside the casing. The radially layered borehole was modeled as a layered plane medium for large operating frequency. A spectral integral approach (complete wave synthesis) was used to compute the response at the receiver locations, which then provided attenuations. Different parameters, such as transducer separation (1-12 in), annulus thickness (0-6 in), annulus impedance (free pipe to good cement), casing thickness (0.25-0.45 in), standoff distance (0.5-1 in) and source frequency (80-200 kHz) were varied in the evaluation of the operation of the tool. The parameter studies based on the theoretical computations revealed that free pipe could be distinguished from the presence of cement in a variety of situations. Additionally, lower bounds on receiver separations are given for reliable operation of the tool. Massachusetts Institute of Technology. Borehole Acoustics and Logging Consortium Gas Research Institute 2012-12-10T20:35:53Z 2012-12-10T20:35:53Z 1997 Technical Report http://hdl.handle.net/1721.1/75349 Earth Resources Laboratory Industry Consortia Annual Report;1997-09 application/pdf Massachusetts Institute of Technology. Earth Resources Laboratory |
| spellingShingle | Rao, Rama V.N. Mandal, Batakrishna Cheng, Arthur C. H. Toksoz, M. Nafi Cement Bond Evaluation Using Early Refracted Arrivals |
| title | Cement Bond Evaluation Using Early Refracted Arrivals |
| title_full | Cement Bond Evaluation Using Early Refracted Arrivals |
| title_fullStr | Cement Bond Evaluation Using Early Refracted Arrivals |
| title_full_unstemmed | Cement Bond Evaluation Using Early Refracted Arrivals |
| title_short | Cement Bond Evaluation Using Early Refracted Arrivals |
| title_sort | cement bond evaluation using early refracted arrivals |
| url | http://hdl.handle.net/1721.1/75349 |
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