WELL OPERATION METHOD Russian patent published in 2011 - IPC E21B43/16 

FIELD: oil and gas industry.

SUBSTANCE: according to the method the well is equipped with two tubing strings; the first string is equipped with non-return valve and packer controlled from well head, and the first string is used for pumping of working agent to the formation. The second string is equipped with bore-hole pump. Its end is arranged above packer and the second string is used for extraction of liquid from formation. Releasing device is installed, working agent is pumped, and pumping is stopped and liquid is extracted from the well. Working agent is pumped through the first string till well injection capacity decreases below 50 m³/day. After pumping is stopped, process exposure is performed till pressure between formation and bottom-hole zone of formation is balanced. Packer is opened and liquid is extracted with bore-hole pump through the second string till bottom hole pressure decreases not lower than gas oil saturation pressure. Liquid extraction is stopped, upper space of well hole is covered with packer above perforation interval, solution margin of surface active substance is pumped and pumping of working agent is continued. Extraction and pumping cycles are repeated.

EFFECT: possibility of preserving injection capacity of injection well at its operation and recovery of injection capacity after process break.

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