FIELD: oil and gas industry.
SUBSTANCE: invention relates to oil and gas industry, in particular to operation of field wells, and can be used in development of oil, gas and gas condensate deposits. Magnetic indicators are used, which characterize the inflow of the well fluid and enter the well fluid from at least one reservoir located in the well, with subsequent analysis of the released indicators, characterized by that the magnetic indicator used is a body consisting of a core made of a magnetic material placed in a magnetically permeable shell made of a substance which does not interact with the well fluid, wherein the distribution of indicators by size is determined.
EFFECT: increasing information content of the method.
7 cl
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