Method and apparatus for transmission of well-bore data on multiple carrier frequencies
US7787525B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 24, 1999 |
| Grant date | Aug 31, 2010 |
| Priority date | — |
| Expiry date | Dec 27, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L5/0044
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A wireline telemetry system and method of transmitting data on multiple carrier frequencies. The system and method adjust power level and number of bits-per-carrier to optimally or near-optimally utilize the capacity of the wireline cable. Due to the nature of wireline telemetry the overall power level is restricted only by the output capability of the downhole telemetry cartridge and the input power restrictions of the uphole telemetry unit receiver. The optimal power level is determined during a training sequence and is a function of such factors as cable length, cable material, cable temperature and cable geometry. The uplink and downlink transmission are executed using different modulation techniques.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.