METHOD FOR DETERMINING INFLOW PROFILE OF OIL AND GAS PRODUCING WELLS USING MARKER DIAGNOSTICS Russian patent published in 2023 - IPC E21B47/11 

FIELD: oil production industry.

SUBSTANCE: invention can be used to control the development of a productive formation. A method is claimed for determining the inflow profile of formation fluid and/or gas in vertical and/or horizontal wells, which includes obtaining a polymer composition containing monodisperse luminescent polymer microspheres as markers, lowering the marker as part of the specified polymer composition into the well, sampling formation fluid on the surface and their subsequent analysis to determine the number of markers of various codes using flow cytometry. The marker is produced using a luminescent substance that fluoresces after exposure to UV radiation or visible radiation with a wavelength from 320 to 760 nm in the wavelength range of 350-780 nm, both individually and in the form of mixtures of these luminescent substances by radical copolymerization, dispersion polycondensation or hydrolytic polycondensation, producing markers both in dry form and in the form of a dispersion containing 10-60 wt.% of dry residue. A polymer composition is used as a carrier medium, in which three-dimensional polymers are used as a base, containing functional fillers selected in such a way that the entire polymer composition has hydrophilic and/or oleophilic properties and/or is capable of releasing markers into the gas stream. The markers are introduced as a part of the horizontal well completion assembly. Determination of codes and concentrations of markers in well fluid samples is carried out using flow cytofluorometry with subsequent processing of its results using software with machine learning algorithms, based on the results obtained, the inflow profiles of the water, hydrocarbon and/or gas phases of reservoir products are determined.

EFFECT: increasing the degree of reliability of the results of determining downhole inflows of oil, water and gas.

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