Linear displacement measurement method and apparatus
US6994162B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 21, 2003 |
| Grant date | Feb 7, 2006 |
| Priority date | — |
| Expiry date | Jul 30, 2023 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/135
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Methods and apparatus for detecting an operation of a downhole tool using an optical sensing system are disclosed. In an embodiment, a flow control device has an inner tubular member moveable relative to an outer tubular member and a thermally responsive chamber capable of a change in temperature during a movement between the inner tubular member and the outer tubular member. Detecting the change in temperature in the thermally responsive chamber with an optical sensing system provides real time knowledge of the position of the flow control device. In another embodiment, a flow control device comprises an inner tubular member moveable relative to an outer tubular member that produces an acoustic signal during a movement between the inner tubular member and the outer tubular member. Detecting the acoustic signal with an optical sensor provides real time knowledge of the position of the flow control device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.