Wellbore telemetry and noise cancellation systems and method for the same
US8004421B2 · kind B2 · utility
54Cited by
47References
13Claims
0Family size
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Key dates
| Filing date | Dec 21, 2006 |
| Grant date | Aug 23, 2011 |
| Priority date | — |
| Expiry date | May 4, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V11/002
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method of signal processing includes providing at least a first pressure sensor and a second pressure sensor spaced in a drilling system and using an algorithm to separate the downwardly propagating waves from the upwardly propagating waves. In one or more examples, an algorithm may include determining a velocity of pressure signals in a wellbore, time-shifting and stacking pressure signals from at least the first pressure sensor and the second pressure sensor to determine a downwardly propagating noise signal, and subtracting the downwardly propagating noise signal from at least the signal from the first pressure sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.