Determining downhole clock drift
A technique is presented for determining the drift of a clock adapted for subsurface disposal. Seismic signals are transmitted through the subsurface medium from an uphole location 14 at selected times, acoustic signals associated with the transmitted seismic signals are received with acoustic senso...
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| Main Authors | , , |
|---|---|
| Format | Patent |
| Language | English |
| Published |
16.06.2004
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| Edition | 7 |
| Subjects | |
| Online Access | Get full text |
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| Abstract | A technique is presented for determining the drift of a clock adapted for subsurface disposal. Seismic signals are transmitted through the subsurface medium from an uphole location 14 at selected times, acoustic signals associated with the transmitted seismic signals are received with acoustic sensors 30 at identified downhole locations. First and second transit times for acoustic signals received at an identified downhole reference location are determined using the clock. A time difference between the first and second signal transit times at the reference point is calculated to determine the clock drift. |
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| AbstractList | A technique is presented for determining the drift of a clock adapted for subsurface disposal. Seismic signals are transmitted through the subsurface medium from an uphole location 14 at selected times, acoustic signals associated with the transmitted seismic signals are received with acoustic sensors 30 at identified downhole locations. First and second transit times for acoustic signals received at an identified downhole reference location are determined using the clock. A time difference between the first and second signal transit times at the reference point is calculated to determine the clock drift. |
| Author | ANDREW HAWTHORN ANTHONY L COLLINS CENGIZ ESMERSOY |
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| RelatedCompanies | SCHLUMBERGER HOLDINGS LIMITED |
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| Snippet | A technique is presented for determining the drift of a clock adapted for subsurface disposal. Seismic signals are transmitted through the subsurface medium... |
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| SubjectTerms | DETECTING MASSES OR OBJECTS GEOPHYSICS GRAVITATIONAL MEASUREMENTS MEASURING PHYSICS TESTING |
| Title | Determining downhole clock drift |
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