Apparatus for measuring the deformation and stress condition of the string of casing of drilled oil wells
US4328704A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1980 |
| Grant date | May 11, 1982 |
| Priority date | — |
| Expiry date | Feb 11, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/007
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for the in situ measurement of the deformation and stress conditions of a string of casings in a drilled oil well is provided with an antimagnetic measuring section mountable in the string of casings at a selected depth and having extensometers fixed on the mantle thereof and a first electronic unit. The unit includes printed circuitry mounted on the measuring section and receptive of the signals from the extensometers for transmitting same. The apparatus also includes a drill hole probe extendable into the interior of the casings to the depth of the measuring section and a second electronic circuit receptive of the transmission from the first electronic circuit to apply same to a cable attached thereto for processing at the surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.