METHOD OF REAGENT DEMUDDING OF WELLS Russian patent published in 1998 - IPC

FIELD: mining industry; may be used in well operation. SUBSTANCE: method includes formation in zone of perforation of the first bath of aqueous solution of acid salt of alkali metal, its holding and removal; formation of the second bath of aqueous solution of hydrochloric acid, its holding and removal. Added to aqueous solution of hydrochloric acid is potassium chloride with concentration of 0.2-2 wt.%. The first bath is removed by displacement and replacement with initial volume of aqueous solution of hydrochloric acid with potassium chloride in the course of formation of the second bath. Initial volume of aqueous solution of hydrochloric acid with potassium chloride after holding is displaced from perforation zone upward by injection of displacing fluid. Displacing fluid is used in the form of said aqueous solution of hydrochloric acid with potassium chloride. The solution is forced through perforation zone to bottom-hole formation zone and held there. The second bath is removed by washing. EFFECT: higher efficiency of demudding of wells and increased well production rate. 8 cl