METHOD FOR REAGENT TREATMENT OF WELL Russian patent published in 1998 - IPC

FIELD: oil and gas production industry. SUBSTANCE: method implies successive injection into bed of technological solutions with acidic, neutral, and alkali reaction of medium which interact with sedimentation conglomerates of natural and/or technogenic genesis. Initially delivered into bed in function of technological solution with acidic reaction of medium is 5-12% water solution of sodium bisulfate with addition of surface-active material 0.5-2.0% in amount equal to volume of pores in zone being treated. Solution is left for reaction period of 2-3 h. Then, delivered into bed in function of technological solution with neutral reaction of medium is 0.2-0.5% buffer water solution of surface-active material in amount of 0.5-1.5 m³. After that, delivered in function of technological solution with alkali reaction of medium is 5-8% water solution of sodium bicarbonate with addition of 0.4-1.5% of surface-active material in amount equal to 0.6-0.8 of volume of first technological solution. Then, development of well is initiated until bed fluid is recovered from well. EFFECT: higher efficiency. 1 tbl