PROCESS OF REMOVE MUD FROM WALLS OF WELL WITH USE OF REAGENTS Russian patent published in 2003 - IPC

FIELD: mining industry, operation of wells. SUBSTANCE: in accordance with process first bath of aqueous solution of acidic salt of alkali metal with addition of potassium carbonate in concentration 0.5-3.0 per cent by mass is formed in perforation zone of critical area of well. First bath is cured, then it is driven away by forcing initial volume of aqueous solution from perforation zone by injection of chaser in which capacity aqueous solution of hydrochloric acid with potassium chloride in mentioned-above concentration is utilized. Later second bath of aqueous solution of hydrochloric acid with potassium chloride in specified proportion is formed in same zone. Aqueous solution f hydrochloric acid with potassium chloride in specified concentration is forced through perforation zone to critical area of well. Second bath is cured and is driven out by flushing. EFFECT: raised hydraulic conduction of formation. 7 cl, 2 dwg