Downhole tool controller using autocorrelation of command sequences
US7171309B2 · kind B2 · utility
13Cited by
24References
27Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 24, 2003 |
| Grant date | Jan 30, 2007 |
| Priority date | — |
| Expiry date | Feb 9, 2024 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/18
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention provides for an apparatus and method of use to control a downhole tool remotely based on the autocorrelation of command sequences. Repeating signals of a priori unknown or undefined shape can be correlated to themselves to reliably distinguish intentional changes from random fluctuations or other operations performed on the well. Using autocorrelation, any fluctuation of pressure of sufficient amplitude can be used to send commands by controlling the timing or the number of repetitions of the sequence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.