FACILITY AND PROCEDURE FOR ESTIMATION OF OIL RESERVOIR Russian patent published in 2010 - IPC E21B49/10 G01N11/16 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to well survey, particularly to procedures of underground reservoir estimation by means of downhole instrument. For this purpose a viscosity gage-densimetre for a downhole tool is arranged in well borehole drilled through an underground reservoir. The downhole tool is designed for supply of at least a portion of reservoir fluid into the viscosity metre-densimetre. The viscosity metre-densimetre consists of a sensitive block and of a design diagram for calculation of at least two parametres of fluid, notably, viscosity and density. The sensitive block is located inside the downhole tool and contains at least two distanced in space connectors, a string suspended with tension between the connectors, and at least one magnet generating magnetic field interacting with the string. The string interacts with reservoir fluid when the viscosity metre-densimetre is inserted inside the downhole tool, and the downhole tool is located in the underground reservoir and intakes fluid from the underground reservoir. The connectors and the string are made out of materials with similar ratios of heat expansion and form a frequency oscillator.

EFFECT: increased reliability of device operation in well; upgraded accuracy of measuring parametres of reservoir in well.

18 cl, 17 dwg