Frequency modulated mud pulse telemetry apparatus and method
US9739144B2 · kind B2 · utility
0Cited by
4References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 2, 2016 |
| Grant date | Aug 22, 2017 |
| Priority date | — |
| Expiry date | Mar 2, 2036 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/24
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus and method to improve transmission of mud pulse telemetry signals is described. A mud pulser is placed in series with a water hammer pulse valve. While generating pulse signals, the mud pulser modulates the flow of mud downstream to the pulse valve. The pulse valve, which cycles at a frequency that is proportional to the flow rate through the tool, operates at a frequency that is effectively modulated by the mud pulser. A sensor that may be at the surface receives a mud pulse signal that comprises both an amplitude modulated component as well as a frequency modulated component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.