Position indicating multiplexed control system and method for downhole well tools
US8636054B2 · kind B2 · utility
4Cited by
19References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 9, 2009 |
| Grant date | Jan 28, 2014 |
| Priority date | — |
| Expiry date | Jun 30, 2031 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Position indication in multiplexed downhole well tools. A method of selectively actuating and indicating a position in a well includes selecting at least one well tool from among multiple well tools for actuation by flowing direct current in one direction through a set of conductors in the well, the well tool being deselected for actuation when direct current flows through the set of conductors in an opposite direction; and detecting a varying resistance across the set of conductors as the selected well tool is actuated, the variation in resistance providing an indication of a position of a portion of the selected well tool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.