Motion sensor for noise cancellation in borehole electromagnetic telemetry system
US6781520B1 · kind B1 · utility
25Cited by
21References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 6, 2001 |
| Grant date | Aug 24, 2004 |
| Priority date | — |
| Expiry date | Apr 1, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H21/0012
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An electromagnetic borehole telemetry system providing improved signal to noise ratio. Adaptive filters use noise channels as references to remove noise from the signal channel. Improved sensors provide noise channels with reduced signal content. Motion sensors are used to detect noise and provide a noise channel free of signal content. The motion sensors are shielded from electromagnetic signals to prevent detection of the telemetry signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.