Production Gamma Ray
The CNPS PGR gamma tool measures gamma radiation from the formation surrounding the wellbore or for particular applications. The detector comprises a 4″ NaI scintillation crystal, photomultiplier and 1.6kV high voltage power supply. All models are compact, rugged and combine excellent 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.
Gamma rays are detected by a high temperature sodium iodide crystal and amplified using a 10 stage photo-multiplier to a measurable level. The detector is temperature compensated to minimize photomultiplier drift. Calibration is effected by a wrap-around CNPS Calibrator with a distributed thorium source of very low radioactive content. The difference between background and calibrator levels provides a ratio between tool count rate and API units. Using the calibrator also monitors tool performance.
Lithology Identification Depth Correlation Identification of Radio Active Scale Tracer Monitoring Gravel Pack Monitoring (with addition of a gamma source) INTERFACING & TOOL COMBINATIONS Simultaneous Operation with other Tools 2 pin feedthrough version for use above high power pulse neutron tools (PGR022, 111/16″, UW only) Sondex Compatible and OPTIONS Ultrawire™ toolbus (UW) or Memory toolbus (Mbus) Slickline memory or surface readout mode (with suitable telemetry controller)
PGR Telemetry XTU or UMT
Sensitivity(niminal) 1 count per API
Accuracy <10%, depends on statistics
Measure Point 134mm
Material Corrosion Resistance
Throughout End Thread(top/bottom) 13/16″ 12 UN2A
GO End connector(top/bottom) 4mm single banana connector.