TY JOUR TI ABOUT DIFFERENT APPROACHES TO USING MILLING TOOLS KW secondary opening of the reservoir KW milling of the production column KW screw downhole motor KW milling tool KW diagnostic criteria KW technical diagnostics JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Shestakova, E.V. PY 2025 IS 10 PB Belgorod State Technological University named after V.G. Shukhov