Well casing corrosion meter
US3999121A · kind A · utility
13Cited by
2References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 11, 1975 |
| Grant date | Dec 21, 1976 |
| Priority date | — |
| Expiry date | Aug 11, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R27/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus for making a surface measurement of well casing external corrosion current including a voltmeter, a variable current source, a reference electrode, and a ground electrode. Current is coupled to the well casing to ground circuit by means of the ground electrode to cause a preselected small, less than 0.02 volt, potential change in the well casing relative to the reference electrode. The voltmeter is used to measure the applied current level which is, for a fixed casing potential change, proportional to well casing corrosion current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.