Description
This Gamma Gun utilizes a ruggedized thallium doped sodium iodide [NaI (Tl) crystal] (3/4 in. x 4 in. diameter) detector with a 1 in. x 3 in. diameter photo multiplier tube (PMT), shock mounted inside the tool housing to provide maximum survivability in a perforating environment.
Ratings & Dimensions
|
Max Temperature |
450°F (232°C) for 4 hours |
|
Maximum Pressure |
20,000 psi (138 MPa) |
|
Outer Diameter |
1.69 in (42.93 mm) |
|
Length |
69.8 in (1772.92 mm) |
|
Weight |
21.0 lb (9.5 kg) |
|
Min Csg/Tbg OD |
2.375 in (60.325 mm) |
|
Max Csg/Tbg OD |
7.0 in (178.0 mm) |
|
Sensor Depth Offset |
Gamma Ray: 46.4 in (1178.56 mm) Casing Collar Locator: 63.5 in (1612.9 mm) |
|
Tensile Strength |
Tension: 60,000 lb Compression: 25,000 lb |
Borehole Conditions
|
Borehole Fluids |
No Restrictions |
|
Tool Positioning |
Centralized | Eccentralized |
Measurements
|
Gamma Ray |
Casing Collar Locator |
|
|
Sensor Type |
Nal(Ti) Scintillation Gamma |
Dual Magnet, Center Coil |
|
Principle |
Naturally Occurring Gamma |
Magnetic Flux Variation |
|
Sensor Spacing |
Proprietary |
|
|
Sensitivity |
Approximately 1.6 counts/API unit |
|
|
Range |
0 to 5,000 cps |
|
|
Vertical Resolution |
14.00 in (355.6 mm) |
|
|
Precision |
5% at 100 GAPI at 15 fpm (4.6 m/min) |
|
|
Data Transmission |
Analog, Pulse, + Polarity |
Analog, Line Wobble, mV |
|
Logging Speed |
Maximum: About 30 ft (9 m) /min to 45 ft (9 to14 m) /min |
Calibration
|
Primary |
Approx. 1.0 cps/GAPI unit |
|
Secondary |
Thorium sleeve, API calibrated |
|
Wellsite Verifier |
Thorium sleeve, API calibrated |
Electrical Specifications
|
Cablehead Voltage |
60 V DC Internally Regulated |
|
Instrument Current |
60 mA |
|
Shooting Power |
300 VDC maximum, using only rollup method, never dumpfire |
Version Control: 2022.02.28
On-line specifications are for REFERENCE ONLY and subject to change without notice. DO NOT USE FOR FIELD OPERATIONS.
