Self-contained gamma-gamma ray density logging tool APGGK-90R
Designed to carry out geophysical well logging using the compensated gamma-gamma ray density logging method.
Designed to explore very pitching and horizontal sections of oil- and gas-well bores filled with oil- and water based circulation fluid.
Active tasks:
- correlation of well logs and lithologic changes;
- detailed lithologic differentiation;
- stratigraphic studies;
- reservoir porosity and permeability determination / clarification;
- geological material mineral composition determination / clarification.
Tool is designed to operate with gamma-ray source Cesium-137 with activity level between 6.65×109 and 3×1010 Bq. Gamma-ray detector units – scintillation detectors with photo-electronic multiplier.
In standard version it is equipped with free rotation unit ensuring drill tool barring during exploration.
Tool APGGK-90R (АПГГК-90Р) can be manufactured in version with a removable source. Such a design allows radioactive source not to be left in a well in case of emergency.
Tool’s new design and developed probe ensure material quality, that is equal to operating quality of tools on logging cable.
| Measured parameters | Geological material volume density |
| Measurement range | between 1.7×103 and 3.0×103 g/cm3 |
| Fundamental relative measurement error limit | between 1.7×103 and 2.0×103 g/cm3 ± 2.0 % between 2.0×103 and 3.0×103 g/cm3 ± 1.2 % |
| General technical specifications | ||
| Tool overall length, mm | 3300 | max |
| Tool diameter, mm | 90 | max |
| Total tool weight, kg | 120 | max |
| Power supply, self-contained, V | 12.5 | |
| Maximum ambient temperature, °C | 90 (120) | see Note |
| Maximum hydrostatic pressure, MPa | 80 | |
| Diameter of the hole, mm | 120÷300 | |
| Logging speed, m/h | 400 | max |
| Standalone downtime, hours in recording mode | 10 | |
| Record frequency, (samples per second) | 2 | |
| Sitting | on drill tool | |
Note: during logging in wells with temperature over +90ºC it is necessary to use either special heat-resisting power supply elements or thermostat control device for rechargeable battery pack.