The equipment was development by AO NPP VNIIGIS in cooperation with AO NPF GITAS
SCOPE OF APPLICATION
The tool is designed for recording the energy spectra of gamma radiation from naturally radioactive
rock formations, the wide-range spectra of capture gamma radiation, and the thermal neutrons
flow density at two different distances from a sealed radionuclide source.
FEATURES
Multiparametric studies realized in one trip:
• The recorded data can be used for lithological stratification of the investigated section,
identification of reservoir rocks, determination of their porosity coefficient and saturation type,
as well as for estimating the content of naturally radioactive elements (NRE) and radiation-active
elements (hydrogen, calcium, silicon, iron, chlorine, potassium, uranium, thorium, etc.).
• Surveys can be conducted in both open and cased holes with a diameter from 110 mm, with a
maximum hydrostatic pressure of 100 MPa and an operating temperature range from +5°C to
+150°C.
• The NGK-Sh spectrometers allow simultaneous recording of automatically stabilized spectra from
both low-energy (100–800 keV) and high-energy (0.8–9.0 MeV) ranges, with 256 channels for each
range.
ADVANTAGES
• The equipment is built with modern scientific and technical expertise and implements all
technologies for assessing geological and geophysical parameters of formations based on
stationary neutron sources.
• Enables the execution of the following methods in a single run: Dual-Spaced Neutron Log
(2NNK), Dual-Spaced Spectral Neutron-Gamma Log - Wide (2SNGK-Sh), and Spectral Gamma Log
(SGL).
The equipment includes
• A downhole tool including a dual-detector SNGK-Sh spectrometer (Spectral Neutron-Gamma Log
- Wide), a GR spectrometer (Gamma Ray Log), and a dual-detector NNК (Neutron Log).
• A surface equipment set, which includes a personal computer (Notebook or IBM/PC type) and
an interface unit. The interface unit ensures data transmission via the logging cable, powers the
downhole tool, and communicates with the depth sensor.
• Software.
SPECIFICATIONS
| Measurable gamma quantum energy range, MeV:: - SNGK - SGL | 0.1-9.00 0.1-3.50 |
| Number of spectrometer quantization channels: - SNGK - SGL | 256Х2 256 |
| Measurable range of NRE content: - Potassium, % - Uranium, ppm - Thorium, ppm | 0.1÷50 1÷1000 1÷1000 |
| Dead time of the spectrometric channel, μs | 4 |
| Energy scale instability, max, % | 1 |
| Operating temperature range, °C | +5 - +150 |
| Operating pressure, MPa | up to 100 |
| Dimensions: -Diameter, mm -Length, m | 94 3.3 |
| Weight, kg | up to 100 |
Download the equipment card