TY JOUR TI USE OF MODIFIED TECHNICAL LIGNINS IN DRILLING TECHNOLOGY KW drilling of wells KW drilling mud 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»