The logging tool is equipped with injector enabling to create in the streaming water a colour mark using the food dye Brilliant Blue (E155) as a tracer. A pair of photometric sensors is located in the axis of the flowmeter in a distance 5 and 10 cm above and below the special outlet nozzle of the injector. The probe is capable to measure vertical flow velocities in the range 10E-4 to 10E-2 m/s or vertical flow rates in the range 10E-6 to 10E-4 m3/s. The proper function and reliability of the logging tool were checked in the model of the well under laboratory conditions.


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