Method and apparatus for multi-channel downhole electromagnetic telemetry
US9771792B2 · kind B2 · utility
3Cited by
7References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 6, 2013 |
| Grant date | Sep 26, 2017 |
| Priority date | — |
| Expiry date | Dec 6, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/18
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An electromagnetic (EM) telemetry method comprises encoding downhole data into a single data stream; separating the single data stream into a plurality of separate data streams; converting each separate data stream into a corresponding separate waveform using a selected digital modulation technique wherein at least one of the frequency and phase of each waveform is assigned a unique value or unique non-overlapping range of values; combining each separate waveform into a combined waveform; and transmitting from a downhole location, an electromagnetic (EM) telemetry carrier wave comprising the combined waveform.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.