Instrument structure and measuring method for cross-casing resistivity tool
US11852773B2 · kind B2 · utility
0Cited by
2References
21Claims
0Family size
Inventor
Key dates
| Filing date | Apr 21, 2022 |
| Grant date | Dec 26, 2023 |
| Priority date | — |
| Expiry date | Apr 21, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/38
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present application provides a device and method for determining formation resistivity outside casing. The device measures the electrical signal of alternating current flowing along the casing, and then calculates phase velocity, group velocity, time difference, amplitude attenuation, and phase difference of the alternating current along the casing. Using these relationships between phase velocity, group velocity, time differences, amplitude attenuation, and phase difference, the formation resistivity outside the casing is calculated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.