Common mode rejection method and apparatus for electromagnetic induction logging
US11988800B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 2022 |
| Grant date | May 21, 2024 |
| Priority date | — |
| Expiry date | Oct 8, 2042 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A90/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of reducing or rejecting common mode interference and a circuit for electromagnetic induction logging with improved common mode interference reduction or rejection are disclosed, which are useful in the field of electromagnetic induction logging technology. Accurate formation signals are calculated based on phases and amplitudes of common mode signals, which do not change with the coil access mode, and phases of differential signals, which are reversed with amplitudes unaltered when the coil is connected reversely. This provides a mechanism to effectively eliminate the influence of common mode interference even when the common mode interference is greater in amplitude than the signals from a geological formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.