METHOD OF CLEANING BOTTOMHOLE ZONE OF FORMATION OF INJECTION WELL Russian patent published in 2016 - IPC E21B37/00 

FIELD: oil industry.

SUBSTANCE: group of inventions relates to oil industry, specifically to cleaning bottomhole zone of oil formation, worsening their operational properties due to contamination of bottomhole zone. Method involves pumping into well a given volume of aqueous solution of surfactant, which is equal to sum of inner volume of tubing, first inner volume of production string and volume of perforated formation covered by drainage; aqueous solution of surfactant is left for response time, is removed by swabbing liquid volume, which exceeds total inner volume of tubing string, second inner volume of string and volume of perforated formation, captured by drainage, degree of excess is determined depending on response time elapsed, expecting deposition of solid suspended particles in sump well in waiting time, washing with water before subsequent start of injection well in operation.

EFFECT: higher efficiency and quality of cleaning, possibility of controlling process at mouth and process without lifting pumping equipment.

18 cl, 1 dwg, 1 tbl