PROCESS OF TREATMENT OF CRITICAL AREA OF FORMATION Russian patent published in 2003 - IPC

FIELD: mining industry, putting of oil field into production, restoration of oil yield of producing wells dropped because of mud injection of asphalt-resin-paraffin deposits and mechanical impurities into critical area of formation. SUBSTANCE: process of treatment of critical area of formation includes sealing of well, formation of periodic waves of negative pressure across well-head by shut-off, time lag and subsequent opening of throw-out branch pipe. Well is filled up to well-head with chaser. Chuck is used to seal well. Periodic waves of positive pressure with decreased level of liquid column is additionally formed across well-head thanks to application of standard pressure of cylinder containing compressed air. With this in mind valve in inlet branch pipe inserted into chuck is open, throw-out branch pipe installed in chuck is first open and then shut-off. Valve in inlet branch pipe is shut off at moment of maximum fall of level of liquid column. EFFECT: enhancement of waves of positive and negative pressure for action on critical area of formation without usage of any submersible equipment. 1 dwg