METHOD FOR INCREASING THE INJECTIVITY OF AN INJECTION WELL FORMATION Russian patent published in 2023 - IPC E21B43/25 

FIELD: oil production.

SUBSTANCE: invention relates to the field of oil production, namely to maintaining reservoir pressure by pumping fluid into the reservoir through injection wells. To implement the method for increasing the injectivity of the formation of an injection well, a pipe string with a packer and a saddle in the lower part is lowered into the production string of the well. The packer is set on the production string with the possibility of separating the lower part of the well from the upper part of the annulus. An instant ball is lowered into the pipe string and liquid is fed into it with an increase in pressure in the pipe string after the ball is seated on the seat with further dropping of the partially dissolved ball from the saddle to the bottom of the well. The packer is set on the production string above the perforation interval, the fluid is supplied to the pipe string from the existing pipeline pressure maintenance system of the injection well. When the ball lands on the seat, the liquid supply to the bottomhole formation zone is interrupted, the upper layer of the ball is dissolved and a short-term pressure pulsation is formed in the bottomhole formation zone at the moment the ball falls out of the saddle.

EFFECT: creation of a series of short-term pressure pulsations in the bottomhole formation zone.

1 cl, 1 dwg