METHOD OF QUANTITATIVE ANALYSIS FOR DISTRIBUTION OF CONTAMINANT PARTICLES WHICH INFILTRATED IN POROUS MEDIUM DURING FILTRATION Russian patent published in 2017 - IPC G01N15/08 E21B49/00 

FIELD: oil and gas industry.

SUBSTANCE: cationic-dyed particles are mixed with granules of loose medium of the colour which is close to the colour of the examined porous medium, and at least three calibration standards are prepared at various known mass concentrations of died particles. The prepared standards are photographed and the images are digitally analyzed based on the RGB additive colour model. The intensity profiles of red, green and blue colours are obtained for each standard. Based on the analysis of the profiles a standard for quantitative characterization of changes in the red, green and blue colours in all calibration standards is chosen and a single calibration curve is received. A suspension of dyed particles is prepared and pumped through a sample of the analyzed porous medium. Then, the sample of porous medium is split into two parts along the suspension direction during pumping and the sample cleavage is photographed under the same conditions under which the images of the calibration standards were obtained. The resulting image of the sample cleavage is digitally analyzed based on the RGB additive colour model and a two-dimension intensity distribution of the red, green and blue colours in the sample cleavage is obtained. The background values of the red, green and blue colour intensity are determined as well as the two-dimension distribution of the mass concentration of dyed suspension particles based on the obtained two-dimension distribution of the red, green and blue colour intensity in the taken image of the sample cleavage using the background values of the red, green and blue colour intensity, selected standard and calibration curve.

EFFECT: simplified and improved information content of the analysis.

16 cl, 9 dwg