PROCESS OF TREATMENT OF CRITICAL AREA OF FORMATION Russian patent published in 2002 - IPC

FIELD: mining industry, extraction of liquid and gaseous media through wells. SUBSTANCE: process of treatment of critical area of formation consists in sealing of well with tubing string positioned in it and perforated productive pool. Working fluid is continuously fed into well in volume larger than current intake capability of pool. Excessive variable static pressure is formed in well. Hydraulic shock is effected in upper part of string. It is transmitted over column of fluid. Hydraulic shock is deflected at outlet from tubing string. Value of change of vibration of sound waves and flow rate of working fluid fed into well are controlled. Lower end of string is displaced through distance equal to value of projection on vertical axis of well of at least one minimal distance between two nearest apertures of perforation with invariable intensity of vibration of sound waves. Hydraulic shock is repeated. Change of intensity of sound vibrations and subsequent increase of flow rate of working fluid are used to judge on detection of at least one zone of equilibrium which balance formation pressure around well within limits of effect of hydraulic shock. When such zone is detected it is subjected to power load of hydraulic shock till sudden rise of flow rate of working fluid is obtained. Employment of process makes it feasible to achieve decrease of required static pressure under which cracking is formed in formation and pores shut off before open and to develop any collectors independent of their geophysical properties. EFFECT: increased fluid conductivity of collectors by treatment of critical areas of productive formations including those comprising dense low-penetrability terrigenous rocks which impenetrability was caused by relaxation of tension around well. 4 cl, 1 dwg