Self-contained pulsed logging tool APILK-90
Designed to carry out geophysical well logging using the method of pulsed neutron-neutron logging of thermal neutrons (2INNK (2ИННК)).
Designed to explore very pitching and horizontal sections of oil- and gas-well bores filled with oil- and water based circulation fluid both in open and cased hole.
Active tasks:
- determination of current oil saturation on oil fields with oilfield brine;
- determination of gas-liquid contact;
- determination of hydrogen content and effective reservoir porosity;
- lithologic sectional layering.
Detector units – proportional or corona helium counter tubes (He-3).
High-frequency neutron pulsed generator MFNG-601 (МФНГ-601) with gas-filled neutron tube AREV-40 (АРЕВ-40) is used as neutron source with energy of 14 MeV. Neutron output (at neutron pulse oscillating frequency of 400 Hz) – up to 2×108 neutrons/sec.
| Measured parameters | Range | Accuracy |
| Neutron-capture cross-section | 3÷55 c.u. | 1.5 % |
| Hydrogen content measurement range | 0÷40 % | 4.2+2.3(40/ КА-1) % |
| General technical specifications | ||
| Tool overall length, mm | 4556 | max. |
| Tool diameter, mm | 90 | max. |
| Total tool weight, kg | 108 | max. |
| Maximum ambient temperature, °C | 90 (120) | see Note |
| Maximum hydrostatic pressure, MPa | 80 | |
| Neutron frequency of oscillation, kHz | 400÷1000 | |
| Time channel number, per each detector unit | 100 | |
| Logging speed, m/h | 800 | max. |
| Standalone downtime, hours in recording mode | 10 | min |
| Diameter of the hole, mm | до 350 | |
| 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.