Gamma Gun – Geiger Muller Tool
Delivers accurate correlation of ballistic services
Applications
- Cased-hole
- Perforating formation correlation
Features and Benefits
- Highly robust Geiger Muller detector
- Compact gamma ray and casing collar locator (CCL)
Tool Description
The Weatherford gamma gun – Geiger Muller tool is a ruggedized tool fitted with a Geiger Muller detector on the lower section of the tool and a passive CCL at the top. The tool is designed to be run with a shooting adapter at the bottom to suit the customer’s choice of gun system. The rugged design enables the tool to operate reliably in the most extreme environments.
Specifications
Ratings and dimensions
| 1-11/16 in. Single Fire | 1-11/16 in. Dual Fire | 2-3/4 in. Single Fire Positive | 2-3/4 in. Single Fire Negative | 2-3/4 in. Dual Fire | 3-1/8 in. Dual Fire |
Maximum temperature | 350°F (177°C) for 4 hours | |||||
Maximum pressure | 20,000 psi (138 MPa) | 18,000 psi (124 MPa) | ||||
Outer diameter | 1.69 in. (42.9 mm) | 2.75 in. (69.85 mm) | 3.125 in. (79.375 mm) | |||
Length | 60.3 in. (1531.62 mm) | 73.2 in. (1859.28 mm) | 55.68 in. (1414.272 mm) | |||
Weight | 21.0 lb (9.5 kg) | 50.0 lb (23.0 kg) | 66.0 lb (29.94 kg) | |||
Minimum casing/tubing OD | 2.38 in. (60.5 mm) | 4.5 in. (114.3 mm) | ||||
Maximum casing/tubing OD | 7.0 in. (178.0 mm) | 11.75 in. (298.45 mm) | ||||
Sensor depth offset | Gamma Ray: | Gamma Ray: 20.8 in. (528.32 mm) | Gamma Ray: | |||
Borehole conditions
| 1-11/16 in. Single Fire | 1-11/16 in. Dual Fire | 2-3/4 in. Single Fire Positive | 2-3/4 in. Single Fire Negative | 2-3/4 in. | 3-1/8 in. |
Borehole fluids | No restrictions | |||||
Tool positioning | Centralized | Eccentralized | |||||
Logging speed | Maximum: About 30 to 45 ft/min (9 to 14 m/min) | |||||
Measurements (all configurations except where noted)
| Gamma Ray | Casing Collar Locator |
Sensor type | Geiger-Muller detector | Dual Magnet, Center Coil |
Detection type | Gamma Radiation | Magnetic |
Principle | Naturally Occurring Gamma | Magnetic Flux Variation |
Range | 0 to 5,000 cps | 0 to 5,000 cps |
Data transmission | Analog, Pulse, + Polarity | Analog, Line Wobble, mV |
Calibration (1-11/16 in. single and dual fire) | Approx. 1.0 cps /GAPI unit1 | N/A |
Calibration (all other configurations) | Approx. 1.6 cps /GAPI unit | N/A |
Electrical specifications (1 11/16 in. single and dual fire)
Cablehead voltage | 60 V Positive DC |
Instrument current | 60 mA |
Shooting polarity | Negative |
Electrical specifications (All other configurations)
Operating voltage | 60V DC internally regulated |
Operating current | 60 mA |
Shooting power | 300V DC maximum, using only rollup method, |
Calibrations
| 1-11/16 in. Single Fire | 1-11/16 in. Dual Fire | 2-3/4 in. Single Fire Positive | 2-3/4 in. Single Fire Negative | 2-3/4 in. Dual Fire | 3-1/8 in. Dual Fire |
Wellsite verifier | — | — | Thorium sleeve | Thorium sleeve | Thorium sleeve | Thorium sleeve, API calibrated |
Primary | — | — | — | — | Approx. 1.6 cps/GAPI unit | — |
Secondary | — | — | — | — | Thorium sleeve, API calibrated | — |
Reach out to optimize reservoir performance
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