METHOD OF WELL REAGENT DEMUDDING Russian patent published in 2000 - IPC

FIELD: mining industry; applicable in well operation. SUBSTANCE: method includes formation in zone of well perforation of the first bath of aqueous solution of acid salt of alkali metal and potassium carbonate. Bath is left to stand and then, removed. Formed in same zone is the second bath of aqueous solution of hydrochloric acid. After washing, the second bath is also removed, and well is completed. Added to solution of acid salt of alkali metal is carbon dioxide gas in concentration of 0.5-3.0 wt.%. Potassium chloride is added to acid solution in concentration of 0.2-2.0 wt.%. The first bath is removed by pumping out. Washing is performed with aqueous solution of hydrochloric acid with potassium chloride of said concentration. Prior to removal of the second bath, solution of hydrochloric acid with potassium chloride is forced through perforation zone into formation. After removal of the second bath, subject to removal from bottom-hole formation zone are water phase, finely dispersed clay minerals and reaction products. EFFECT: higher efficiency of demudding of wells and increased their production rate. 9 cl, 2 dwg