General Information：
PNNG Pulsed Neutron Dual-Spectrum Saturation Logging Tool, also called Pulsed Neutron-Neutron & Gamma-Ray Tool, not only has their respective benefits of the pulsed neutron-neutron logging tools and pulsed neutron-gamma-ray tools but also intensifies the compensation functions of these two logging tools. It may perform neutron lifetime log, capture gamma ray spectrum log, natural gamma ray log and the measurement of well temperation, pressure and casing callor locator in a single logging run. The tool includes a thermal neutron detector and a gamma ray etector for measuring simultaneously a thermal neutron time spectrum and capture gamma ray spectrometry. It may also record the counting rate of two types of detector so it has abundant log information and advanced log interpretation methods and a simple log processing technology. PNNG pulsed neutron dual-spectrum saturation logging integrates the combined measurements of several log methods, which may efficiently improve the interpretation coincidence rate and the measurement accuracy. The quantitative analysis of neutron lifetime logs may be made when the water salinity of earth formation is greater than 10000ppm and the qualitative analysis of neutron logs may be done when the salinity of the earth formation is within the range of 5000~10000ppm. So PNNG logging tool is an optimal device for measuring the residual oil saturation in the earth formation with low-pore and low-lermeability and low-salinity.
Specification
- Dimensions: φ43×4800mm
- Σmeasurement range: 7.6c.u.~91c.u.
- The yield of its neutron generator ≥ 1.5×108n/s
- The recommended Logging speed: 360m/h
- Tool Weight: 45kg
- The Max. Pressure of Housing: 80MPa
- Operation Temperature: -25℃~+150℃
- Measurement Accuracy:±2%
Benefits and Features
- Simutaneously measure the thermal neutron time spectrum and capture gamma ray time spectrometry.
- Simultaneously measure the thermal neutron counting rate and capture gamma ray counting rate.
- The data processing may be made based on multivariant analysis and various logging information are efficiently integrated so the log interpretation coincidence interpretation coincidence rate may be enhanced.
- High measurement accuracy and good logging repeatability with the advanced filtering technique.
- A great automatic measurement processing; automaticaly trace the change of the formation macroscopical capture cross section.
- Adopting the stablizing voltage of neutron tube target voltage, the apparatus may ensure the neutron yield stability and improve the measurement accuracy.
- Perform natural gamma-ray logs.well temperature logs, pressure logs and casing callor locator logs and neutron lifetime logs in a single logging run.
- Compared with the conventional neutron lifetime log, PNNC log may extend its applications and may measure the residual oil in the earth formation where the salinity is greater than 10000ppm and may enhance efficiently the measurement precision of the residual oil saturation.
Applications
~ Adopting the log data. PNNG log may be used to identify water-bearing layers and potential pay zones, evaluate the water-flooded level of the pay zone. obtain the water-flooded rules of the reservior.fmd the water-bearing layer and provide a good base for controlling water and increasing oil production.
~ Inspect cementing bond quality and identify the bypass channel and the leakage formation.
~ The obtained formation macroscopical capture cross section may be used to compute the residual oil saturation of the earth formation.
~ The gamma-ray counting rate and the thermal neutron counting rate and their ratio may be used to identify the hydrocarbon reservior and the water-bearing layer and find the leakage gas-bearing formation.
~ Check the cementing and plugging effect.
~ Identify the salt-plug oil reservoir.
Add：Building No. 9, No. 699, Hangtiandonglu, Xi'an, Shaanxi, P.R. China
Tel: 86-29-85930849
Email: aohuaelectronft@163.com
