TREATMENT METHOD OF BOREHOLE ZONE OF PRODUCTIVE FORMATION Russian patent published in 2020 - IPC E21B43/16 E21B43/25 E21B43/32 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the field of oil and gas industry and is intended for solving problems of recovery of well productivity and intensification of oil production. Invention comprises method of treatment of borehole formation zone. Rotary hydraulic vibrator and jet pump are lowered to the well and installed in series from below upwards on the tubing string. Fluid medium is fed into rotary hydraulic vibrator to intensify vibration-wave action on wellsite zone of productive formation. At the same time fluid medium with colmatage particles is pumped out with the jet pump to the surface. Backfill is injected and held until hardening. Then hydrocarbon solvent is pumped, held for 1–2 hours. Then acid composition is pumped, flushed with buffer fluid into bed and held for 1.5–2 hours. Reaction products and the unreacted acidic composition are pumped out with the help of a jet pump. pH of the unreacted acid composition purified from oil and mechanical impurities is determined. Rotary hydraulic vibrator performs continuous rotation and back-and-forth movement along perforation interval. All operations are performed in one lowering-lifting.

EFFECT: increased oil flow rate, reduced water cut in produced product.

1 cl, 1 dwg