Buried wellbore location from surface magnetic measurements
US11243323B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 2019 |
| Grant date | Feb 8, 2022 |
| Priority date | — |
| Expiry date | Jul 29, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/26
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for locating a buried casing stub may comprise a) identifying a target region, b) providing at each of a plurality of survey points in the target region a casing stub locator that includes a vector magnetometer, c) measuring the magnetic field at each of the survey points using the vector magnetometer so as to generate a plurality of magnetic field measurements, d) using the magnetic field measurements to generate a model of the magnetic field of the target region, e) fitting the model generated in step d) to a selected model of a magnetic anomaly created by the casing stub so as to generate model fit information (MFI), and f) locating the casing stub using the MFI. At each survey point, an expected Earth magnetic field can be subtracted from the measured magnetic field. A total station can measure the position and/or the azimuth of the package.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.