Autonomous Density GAMMA-GAMMA Logging APGGK-90RI
It is used to study very shallow and horizontal sections of the trunk of oil and gas wells filled with flushing fluid based on oil and water.
Tasks to be solved:
- correlation of well sections and lithological changes;
- detailed lithological dissection;
- stratigraphic studies;
- determination / refinement of filtration-capacitive properties;
- determination / refinement of the mineral composition of rocks.
The device is designed to work with a cesium-137 gamma radiation source with an activity of 6.65 × 10 9 to 3 × 10 10 Bq. Gamma-ray detectors - scintillation detectors with PMT.
It is equipped as standard with a free rotation unit, which allows turning the drilling tool during research.
The APGGK-90RI device is manufactured with a recoverable source . This design allows in case of an accident not to leave radioactive sources in the well.
The new design of the device and the developed probe allow to obtain the quality of the material, not inferior to the quality of the work of the instruments on the wireline.
Measured parameters | Rock bulk density |
measurement range | 1.7 × 10 3 to 3.0 × 10 3 kg / m 3 |
The limit of permissible basic relative measurement error | from 1.7 × 10 3 to 2.0 × 10 3 kg / m 3 ± 2.0% from 2.0 × 10 3 to 3.0 × 10 3 kg / m 3 ± 1.2% |
General technical data | ||
Total length of the device, mm | 3300 | no more |
Diameter of the device, mm | 90 | no more |
The total mass of the device, kg | 120 | no more |
Power, autonomous, V | 12.5 | |
Maximum ambient temperature, ° С | 90 (120) | |
Maximum hydrostatic pressure, MPa | 80 | |
Well diameter, mm | 120 ÷ 300 | |
Logging speed, m / h | 400 | no more |
Battery life, hours in recording mode | 10 | |
Recording Frequency, (polls per second) | 2 | |
Accommodation | on a drilling tool |
Note: when logging in wells with temperatures above + 90ºC, it is necessary to use special heat-resistant batteries or thermostatic control unit of the battery pack.
The device is equipped with a spring :
Spring Length L | Spring Width B | Well diameter |
1100 | 44 | 90-300 |