Method for acoustic signal transmission in a drill string
US6847585B2 · kind B2 · utility
12Cited by
14References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 11, 2001 |
| Grant date | Jan 25, 2005 |
| Priority date | — |
| Expiry date | Oct 11, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/16
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention is a method of transmitting one or more acoustic signals in a drill string using PSK, ASK, FSK or MSFK. The method includes determining one or more stopbands and one or more passbands by testing or modeling the drill string. Two modulating frequencies are selected that are equidistant about a carrier frequency, and which are located within at least one passband. Data representative of downhole measurements or calculations are converted to signals to be transmitted at the modulating frequencies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.