Production gamma ray tool for cased-hole lithology and correlation
The Production Gamma Ray (PGR) tool measures naturally occurring radiation emitted by formations to help determine lithology. Radioactive scale can also be detected. Existing copy describes the models as compact and rugged, combining sensitivity with high resolution for cased-hole production logging applications.
Tools can be combined for tracer work and, with the addition of a gamma source, used for gravel-pack investigations. Published feature themes on this page include lithology identification, depth correlation, identification of radioactive scale, tracer monitoring, and gravel-pack monitoring when a gamma source is added.
Specification figures already listed on the product include 350°F (177°C), 15,000 psi (103.4 MPa), diameters of 1 3/8 in (35 mm) and 1 11/16 in (43 mm), lengths of 19.7 in (500 mm) and 23.1 in (586 mm), and weights of 5.1 lbs (2.3 kg) and 9.4 lbs (4.3 kg). Treat those as the on-page baseline and confirm which model applies to your string.
Key applications
- Cased-hole production logging lithology and depth correlation
- Radioactive scale detection
- Tracer monitoring programs
- Gravel-pack investigations (with addition of a gamma source)
What to confirm with CNPS
- Tool OD / length / rating for your well and string
- Whether tracer or gravel-pack (gamma source) configuration is required
- Combinability with other production-logging tools in the string
