Positioning method and tool for determining the position of the tool in a casing downhole
US9726005B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 2012 |
| Grant date | Aug 8, 2017 |
| Priority date | — |
| Expiry date | Feb 13, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/26
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a positioning method for determining a position of a downhole tool moving at a velocity in a casing in a well, comprising the steps of measuring a magnitude and/or direction of a magnetic field by means of a first sensor several times over a time period while moving along a first part of the casing manufactured from metal, determining a manufacturing pattern of the casing along the first part from the measurement measuring a magnitude and/or direction of a magnetic field by means of the first sensor several times over a time period while moving along a second part of the casing manufactured from metal, determining the velocity of the tool along the second part, adjusting the determined velocity of the tool along the second part based upon the manufacturing pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.