Simultaneous gamma ray measurement of formation bulk density and casing thickness
US4297575A · kind A · utility
49Cited by
4References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1979 |
| Grant date | Oct 27, 1981 |
| Priority date | — |
| Expiry date | Aug 13, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V5/125
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for simultaneously measuring the formation bulk density and the thickness of casing in a cased well borehole is disclosed. Low energy gamma rays are emitted into the casing and formation in a cased borehole. Two longitudinally spaced detectors detect gamma rays scattered back into the borehole by the casing and surrounding earth materials. The count rate signals from the two detectors are appropriately combined according to predetermined relationships to produce the formation bulk density and the casing thickness, which are recorded as a function of borehole depth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.