METHOD FOR DETECTING FLUORESCENT AND ALCOHOL TRACERS IN THEIR JOINT PRESENCE IN FORMATION WATERS DURING TRACER INTERWELL SURVEYS Russian patent published in 2023 - IPC G01N21/64 G01N30/02 

FIELD: analytical chemistry.

SUBSTANCE: invention can be used in the field of the oil industry, in particular in the study of wells and interwell space. A method for detecting fluorescent and alcohol tracers in their joint presence in formation waters during tracer cross-well surveys, including analysis of a composition of indicators for geophysical surveys in formation water with their joint presence, separation of the studied sample of formation water from oil, purification of the sample from fine and organic impurities by clarification with a coagulant in an alkaline medium and centrifugation, dividing the sample into several portions, adding additional reagents to each portion of the sample to improve the quality of the analysis, carrying out sequential to quantitative analysis of the composition of indicators in the formed portions of the sample using fluorescence spectroscopy methods and chromato-mass spectrometry. The indicator composition consists of sulfosalicylic acid, 4-methylumbelliferone, tinopal CBS-x, sodium fluorescein, eosin B, rhodamine C, safranin T, methylene blue, monoethanolamine, diethanolamine, propylene glycol, 2-ethoxyethanol, ethylene glycol, diethylene glycol, isopropanol, glycerine, whereas fluorescent tracers are analysed at the pH of the medium in which they exhibit the most intense luminescence properties, taking into account the intersection of the luminescence spectra of tracers with a close arrangement of emission peaks, and tracers based on alcohols with a wide boiling temperature range of 82.4 - 290°C are analysed under optimal conditions for the flow rate of the carrier gas and the temperature sweep of the chromatograph column.

EFFECT: increased accuracy of the quantitative determination of tracers and reduced error in taking spectra.

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