METHOD FOR TREATING BOTTOM-HOLE ZONE OF INJECTION WELL

摘要

FIELD: oil production industry. SUBSTANCE: according to method, selected is injection well which opens oil bed with permeability not over 500 mD. Well is flushing by solvent of asphalt-resin and paraffin-hydrate depositions with circulation of liquid during 6-10 h. Then selected injection well is filled with clean solvent of asphalt-resin and paraffin-hydrate depositions. Pressure is created in this well which is close in value to testing pressure of casing string, then pressure is sharply released to atmospheric value. These cycles of creating and releasing pressure are repeated 10-15 times. Now injection well is flushed by water solution of surface-active substance. Injection well is subjected to pulse-depression treatment with pumping out well fluid. Injectability of well is tested by pumping in solution of surface-active substance. Application of aforesaid method ensures increasing permeability of bottom-hole zone of injection well. EFFECT: higher efficiency.