FIELD: petroleum industry.
SUBSTANCE: invention relates to the extraction of petroleum, gas, and condensate. Method for treating a borehole for extracting petroleum, gas, and condensate includes, when the productivity of the borehole decreases due to the deposits of high molecular weight compounds in the bottomhole zone, supplying supercritical carbon dioxide fluid to the borehole and restoring the bottomhole zone of the borehole by temporarily switching the borehole from the operational state to the restorative state. Prior to supplying to the borehole, the supercritical carbon dioxide fluid is heated by 20 to 60°C above the formation temperature and moistened by injecting demineralised water or steam created by evaporating demineralised water in a heater after the dosing pump into said fluid using a dosing pump through a spraying nozzle. The supercritical carbon dioxide fluid herein is moistened so that the relative humidity thereof at the wellhead and along the length of the tubing string of the borehole is less than 100% without water vapour condensation and associated corrosion, and 100% relative moisture content is provided at the bottomhole with water vapour condensation and dissolution of carbon dioxide therein; nitrogen squeezing is then performed.
EFFECT: increase in the production rate of a productive borehole due to the intensification of mutual dissolution of high molecular weight compounds of oil rims and the injected fluid system, reduced emergency-causing corrosion of pipes in injection boreholes.
6 cl, 1 wdg, 1 tbl, 2 ex
