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Main: Neutron generators: Geophysical research
VNIIA is involved in the development and serial production of the equipment for pulsed neutron logging of wells in various operating environments and at various stages of mineral deposit development.
The equipment includes:
The downhole tool includes:
The AINK is delivered to a customer jointly with the software package, the spare neutron generator, the required tool kit, the technical description and circuitry diagram manual. At a customer's request additional items can be included in the delivery set. The equipment has the software package for methodology and metrology support as well as for logging data processing. The equipment is developed for operating jointly with the logging system consisting of the well logging station and up to 7 km long single conductor hoist logging cable. The equipment service life is 5 years subject to replacement of the neutron generators, which operating life is over. The fact that the equipment uses neutron generators instead of isotopic sources significantly reduces the radiation hazard risk when operating in a well and also when taking calibration measurements. The equipment design allows for replacing the neutron generators in the field conditions. The AINK incorporates the PU-10 control and monitoring unit suitable for all types of the downhole tools. This unit provides the interface between the downhole tool and the well logging station components - the truck-borne computer, the power supply source, the depth magnetic sensors.
The control and monitoring unit operating life is 1000 hours and the equipment service life is 5 years.
Application area: cased oil and gas wells including those with installed pumping stations. Logging methods: pulsed neutron logging with thermal neutron detection. As a result of measurements and data processing the following is obtained:
The thermal neutron absorption macroscopic cross-section measurement range is 7.4·10-3 - 30·10-3 sm-1.
The downhole tool incorporates either the ING-101 or the ING-10-50-120 pulsed neutron generator. The detector unit has two slow neutron counters.
Application area: cased and open oil and gas wells. Logging methods: pulsed neutron logging with thermal neutron detection. The AINK-89 equipment uses the highly efficient well exploration technique that combines the neutron logging and pulsed neutron logging methods. As a result of measurements and data processing the following is obtained:
The thermal neutron absorption macroscopic cross-section measurement range is 7.4·10-3 - 30·10-3 sm-1. The rock water-filled porosity measurement range is 1 - 36 %.
The downhole tool incorporates the ING-06 pulsed neutron generator. The measurement probes have from one to three slow neutron counters. Four measurement probes provide for measuring not only time but also spatial distribution of thermal neutrons inside a well. One of the advantages is over 300 hours operating life of the neutron emission unit incorporated in the AINK-89 equipment.
Application area: cased and open ore boreholes.
Logging methods:
The equipment is designed for direct measurement of natural uranium content in radioactive ore boreholes filled with underground water, low acid and low alkaline solutions or drilling fluid. At the same time the AINK-60 equipment is capable of measuring radium content (in uranium measurement units) using the gamma-ray logging data. The range of measurement of natural uranium content is 0.005 - 0.5 %. The range of measurement of radium content (in uranium measurement units) is 0.005 - 1 %. During the logging process the downhole tool measures:
To enhance measurement accuracy the downhole tool is capable of monitoring fast neutron flux.
The downhole tool incorporates the ING-101 pulsed neutron generator. The equipment metrology characteristics are ensured by a field graduation unit that is supplied jointly with the equipment.
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