Gamma Logging Tools
ASL gamma tools consist of a robust pressure house, containing a sensitive scintillation detector and high temperature electronics which sends pulses representing detected gamma radiation to surface. Our gamma instruments can be fitted quickly and easily to both digital and analogue tool systems.
Gamma ray tools are highly useful within borehole characterisation. Gamma ray tools measure the relative naturally occurring radiation adjacent to the well hole providing a tool for well-run correlation and lithological identification.
The GRT-2 HP Gamma Ray Tool is a standard scintillation detector type production gamma ray tool housed within an in-line ASR-1 body. This arrangement allows the GRT-2 to be inserted anywhere within an analogue ASR tool string or between the wireline adapter and TAS section within a GeochainTM string.
- Surface Control – The Geochain System Panel (GSP) with an inbuilt Gamma Control Module (GCM) is required for all gamma tool systems. For analogue systems a Dual Control Panel (DCP-2) is required to power the tool. This new panel system has replaces the now obsolete GCM box, which interfaced the DCP-1 with the GSP.
The GRT-2 EHP has been built and tested for 30,000 psi operation. This variation offers a heavier weight, 3 1/4” diameter and is optimised for the Geochain EHP system.
- Surface Control – The Geochain System Panel (GSP) with an inbuilt Gamma Control Module (GCM) is required for all gamma tool systems. For analogue systems a Dual Control Panel (DCP-2) is required to power the tool. This new panel system has replaced the now obsolete GCM box, which interfaced the DCP-1 with the GSP.
The GRT-5 Gamma Ray Tool is a standard scintillation detector type production gamma ray tool housed within an in line GSR compatible body. The GRT-5 is run in “digital” gamma mode. In this mode the GRT-5 is connected immediately below the STAS. The STAS provides the gamma power and reads the gamma count via pin 3. The STAS transmits the gamma information to the surface digitally with all other status information in Geochain Slim’s Monitor mode.
- Surface Control –The Geochain System Panel (GSP) with an inbuilt Gamma Control Module (GCM) is required for all gamma tool systems.
GRT-100 This gamma ray tool is housed within an in line GO body. The GRT-100 has been designed to run on the end of a GeochainSlimTM tool string. However as the tool is through wired it can also be used in conjunction with any compatible monocable tool string.
The GRT-100 is connected immediately below the STAS. The STAS transmits the gamma information to the surface digitally with all other status information in Geochain Slim’s Monitor mode.
Surface Control –The Geochain System Panel (GSP) with an inbuilt Gamma Control Module (GCM) is required for all gamma tool systems.
Avalon Gamma Logging Tool specification comparison table
| Specifications | GRT-2 HP | GRT-2 EHP | GRT-5 | GRT-100 |
| Length | 33.5″(853mm) | 33.5″(853mm) | 28″ (720mm) | 24″ (618mm) |
| Diameter | 3″ (76mm) | 3″ (76mm) | 1-11/16th” (43mm) | 1-11/16th” (43mm) |
| Weight | 26lb (12kg) | 38lb (17kg) | 9lb (4.1kg) | 8.4lb (3.8kg) |
| Temperature | 350°F (180°C) | 350°F (180°C) | 350°F (180°C) | 350°F (180°C) |
| Pressure | 25,000 psi (1750 bar) | 30,000 psi (2070 bar) | 20,000 psi (1375 bar) | 20,000psi (1375 bar) |
| Connection | ASR | ASR | STAS | GO 1 Monocable |
| Operating Voltage | +60V DC | +60V DC | +60V DC | +60V DC |
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