System and methodology of cross casing resistivity tool
US11249216B2 · kind B2 · utility
1Cited by
3References
19Claims
0Family size
Inventor
Key dates
| Filing date | Sep 10, 2017 |
| Grant date | Feb 15, 2022 |
| Priority date | — |
| Expiry date | Mar 25, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/38
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention provides a methodology and system for determining formation resistivity beyond a casing. Using devices to generate, direct, and measure electric signals, the travel speed, travel time, attenuation and phase shift of an electric signal traveling through the casing can be measured. Applying a relationship between the travel speed or travel time of an electric signal and the formation resistivity beyond a casing, it is then possible to determine the formation resistivity beyond a casing by measuring the travel speed or travel time or phase shift or attenuation of an electric signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.