TY JOUR TI HEAT-RESISTANT REAGENTS FOR DRILLING WELLS KW drilling of wells KW drilling reagent KW lignin KW chemical modification KW lignosulfonic acids KW lignopolymers JO Modern Technologies and Scientific and Technological Progress AU Scherbin, S.A. AU Evdokimenko, D.S. AU Borisov, A.V. PY 2023 IS 2023 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»