METHOD FOR UNDERGROUND WELL REPAIR FOR REPLACEMENT OF DOWNHOLE PUMPING EQUIPMENT WITHOUT ACTION ON FORMATION Russian patent published in 2016 - IPC E21B29/00 E21B34/06 E21B34/16 

FIELD: oil industry.

SUBSTANCE: invention relates to production of hydrocarbons and can be used during underground repair of wells equipped with flush lift, electric centrifugal or other pumps. Method includes using a through packer installation with an anchor mechanism. Apparatus includes emergency disconnection device, a valve unit with a seat for ball and mechanism to prevent ejection of ball into space above packer. There are units for telemetry and release of balls directly attached to lower part of electric submersible pump. Based on instruction from mouth, ball is released and excess pressure is used to install said ball in seat of valve assembly. Communication with productive formation is performed by generation of excess pressure in packer space and squeezing of ball on bottom hole.

EFFECT: technical result is improved efficiency of procedure due to possibility of lifting of well pump for repair and carrying out preventive operations without impact on bed.

1 cl, 5 dwg