Position sensor for a downhole completion device
US8237443B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 2008 |
| Grant date | Aug 7, 2012 |
| Priority date | — |
| Expiry date | Sep 8, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/0753
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The position of a movable downhole component such as a sleeve in a choke valve is monitored and determined using an array of sensors, preferably Hall Effect sensors that measure the strength of a magnetic field from a magnet that travels with the sleeve. The sensors measure the field strength and output a voltage related to the strength of the field that is detected. A plurality of sensors, with readings, transmits signals to a microprocessor to compute the magnet position directly. The sensors are in the tool body and are not mechanically coupled to the sleeve. The longitudinal position of the sleeve is directly computed using less than all available sensors to facilitate the speed of transmission of data and computation of actual position using known mathematical techniques.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.