METHOD OF WELL TREATMENT Russian patent published in 2001 - IPC

FIELD: oil producing industry, particularly, methods of well treatment to increase their injectivity or productivity. SUBSTANCE: method includes injection to bottom-hole zone of aqueous solution of polycationite to reduce clay swelling. Preliminarily injected to bottom-hole zone is aqueous solution of mixture of potassium and sodium chlorides. Polycanionite is injected in aqueous solution of mixture of potassium and sodium chlorides with nonionic surfactant. Aqueous solution of mixture of said chlorides is used with concentration of potassium chloride of 1.0-2.5 wt.%, sodium chloride, 2.5-4, and concentration of polycationite and nonionic surfactant of said chlorides of at least 0.17 wt.% each in aqueous solution of mixture. Mixture of said chlorides may be used in the form of sylvinite mineral. EFFECT: higher efficiency of method of treating the producing and injection wells. 3 cl