METHOD FOR INCREASING INJECTIVITY OF INJECTION WELL FORMATION Russian patent published in 2024 - IPC E21B37/00 E21B43/25 

FIELD: oil, gas and coke-chemical industry; mining.

SUBSTANCE: invention relates to oil production, namely to maintaining formation pressure by pumping fluid into formation through injection wells. Method for increasing the injectivity of the formation of an injection well includes lowering a pipe string with a packer and a seat in the lower part into the production string of the injection well, seating the packer above the perforation interval with separation of the lower part of the well from the upper part of the annular space. Further, the ball is dumped into the pipe string and fluid is fed into it from the existing pipeline system for maintaining pressure of the injection well, liquid supply to the bottomhole formation zone is stopped when the ball lands on the seat and the ball falls out of the seat. Wherein pressure is increased in the pipe string after the ball is fitted on the seat to force the ball out of the seat to allow formation of short-term pressure pulsations in the bottomhole formation zone. Before lowering, intermediate seats are additionally placed in the pipe string above the seat. End of pipe string is connected to perforated cartridge and shank with plug, providing collection of dropped ball. A rubber ball with a metal core connected by a metal rod with a weighting agent with the size smaller than the flow passage of the seat is used as a dropped ball.

EFFECT: increased efficiency of the method for increasing the injectivity of the injection well formation.

4 cl, 2 dwg