Recalibration of downhole sensors
US7168507B2 · kind B2 · utility
17Cited by
175References
38Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 21, 2003 |
| Grant date | Jan 30, 2007 |
| Priority date | — |
| Expiry date | Jan 22, 2024 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In downhole drilling tools, a first set of inexpensive and/or relatively small sensors that typically have lower accuracy and higher drift than conventional downhole sensors are located in the drill string adjacent to the bit. A second set of highly accurate sensors is located in a more protected location higher in the drill string away from the drill bit. As drilling progresses these sensors pass through the same portion of the formation measured by the first set of sensors. Key properties are measured by the second set of sensors which allow a calibration offset to be applied the data measured by the first set of sensors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.