Method and apparatus for detecting the location of defects in tubular sections moving past a well head
US4636727A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 11, 1984 |
| Grant date | Jan 13, 1987 |
| Priority date | — |
| Expiry date | Apr 11, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/9026
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A tubing trip tool for use in determining the extent of defects in tubular elements comprising a continuous string used in a subterranean oil or gas well during removal of the string from the well is disclosed. Local defects and axially extending defects, as well as the average wall thickness of the tubular elements, are measured. The position of the defects is determined by measuring the variable velocity of the tubular elements as they are removed from the well and by detecting end couplings having a larger cross-sectional area and the direction in which the end couplings are moving. A string profile of the position of the defects in the continuous string can also be established.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.