METHOD OF RESTRICTING WATER INFLOWS IN WELLS ENCROACHED WITH BOTTOM WATER BY MEANS OF SLIGHTLY CONCENTRATED SOLUTIONS OF ACRYL-SERIES POLYMERS Russian patent published in 2002 - IPC

FIELD: mining. SUBSTANCE: method includes successive injection of hydrogen chloride solution, slightly concentrated solution of acryl-series polymer and displacing fluid. Injected initially is 0.1-0.5-% solution of nonionic surfactant; and introduced into 10-15-% solution of hydrogen chloride is addition of hydrogen fluoride to obtain its concentration in acid solution up to 1-5%. After injection of slightly concentrated solution of acryl-series polymer of 0.05-1.5% concentration, 6-7- solution of hydrogen chloride is injected as displacing fluid. Nonionic surfactant is used in the form of AF_9-12. EFFECT: increased quality of isolation work and time between overhauls. 2 cl, 1 tbl