Gamma Ray Tool
Enables calibrated cased-hole formation evaluation and correlation
Applications
- Correlation to formation and wellbore tubulars
- Shaly formation evaluation
Features and Benefits
- Combinable with
- Cement bond logs to fully understand zonal isolation
- CCL to provide baseline completion correlation
Tool Description
The Weatherford gamma ray tool is compact, robust, and accurate. It precisely measures natural gamma-ray flux in a wellbore.
Specifications
Ratings and Dimensions
Maximum temperature | 350°F (177°C) |
Maximum pressure | 15,000 psi (103.4 MPa) |
Outside diameter | 1.69 in. (43.3 mm) |
Length | 28.3 in. (719 mm) |
Weight | 12.7 lb (5.8 kg) |
Min casing/tubing OD | 2.38 in. (60.5 mm) |
Max casing/tubing OD | 7.0 in. (178 mm) |
Tensile strength | Tension: 65,000 lb |
Measure point | 6.4 in. (163 mm) |
Borehole Conditions
Logging speed | Recommended: 60 ft/min (18.2 m/min) |
Tool positioning | Centralized | eccentralized |
Hardware Characteristics
Sensor type | Thallium-activated sodium iodide crystal |
Transmission type | Analog, pulse, or telemetry |
Data rate | 20 frames/sec at 20 kHz |
Combinability | Radial bond tool, cement-bond log, temperature |
Connections | GO top /GO pin bottom |
Electrical
Voltage | 100 V DC |
Measurements
Principle | Natural gamma radiation |
Range | 0 to 10,000 counts per s |
Resolution | 6.0 in. (152.5 mm) |
Accuracy (1SD) | ± 5% |
Sensitivity | Approximately 0.998 counts/s per API unit |
Primary curves | GR (API) |
Secondary curves | Head voltage, internal temperature (telemetry only) |
Calibration
Primary | Houston API pits |
Wellsite verifier | Thorium blanket |
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