Timeline from slumber to collection of RFID tags in a well environment
US9394756B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 2013 |
| Grant date | Jul 19, 2016 |
| Priority date | — |
| Expiry date | Dec 13, 2034 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/138
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Sensor assemblies are deployed in a borehole for a well, such as an oil well or other hydrocarbon recovery well. The sensor assemblies are coupled to a casing string (e.g., the exterior of the casing), and may detect RFID tags or other properties of material (e.g., fluids) in an annulus surrounding the casing string. Limited battery power for the sensor assemblies and for assemblies for communicating sensed data may be a concern, and the sensor assemblies and communication assemblies may therefore operate in different modes of varying power consumption. In certain modes, sensing operations are curtailed (or expanded) depending on particular requirements. In one case, sensor operation is expanded during active portions of a cementing operation, and curtailed prior to and thereafter. Different triggering events may cause the sensor assembly to operate in different modes at different sensing frequencies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.