METHOD AND DEVICE FOR MEASURING DENSITY AND VISCOSITY OF FLUID IN WELL Russian patent published in 2006 - IPC G01N9/00 G01N11/16 

FIELD: investigating or analyzing materials.

SUBSTANCE: method comprises exciting continuous vibrations by means of a vibrator submerged into the fluid to be analyzed and recording varying frequency of vibration. The vibrator is excited at a low frequency of 300-1000 Hz, and frequency and amplitude of vibration is measured at a higher frequency. The device comprises closed magnetic circuit made of two converging branches of the magnetic core with minimum space between them. The magnetic core should be made of a material with magnetic permeability within 200-125000. The space of the circuit receives converters with magnetic resistors having wide bandwidth within 2-5 MHz and wide dynamic range that is higher than 100 dB.

EFFECT: enhanced precision.

7 cl, 5 dwg