METHOD OF ISOLATION OF LEAKAGE OF MULTIHOLE WELL Russian patent published in 2020 - IPC E21B33/10 

FIELD: drilling of wells.

SUBSTANCE: invention relates to insulation of leakage of multihole well and increases efficiency of downhole pumping equipment operation of production wells, isolating all intervals of non-tightness in a multi-hole well, including in zone of connection point of columns of pipes of a side shaft with a column of pipes of the main shaft and higher in multi-hole well. Method comprises running-in packer with cable entry or without cable entry and sealing of power cable in packer and installation of packer with cable entry or without cable entry and sealing of power cable in packer in multihole well with possibility of insulation leakage. At that, additionally installed on tubing under packer is electric pump with submersible electric motor, multi-hole well is a well with main shaft, consisting of columns of casing pipes of larger diameter, changing into side shaft consisting of columns of casing pipes of smaller diameter, and a connection point of columns of pipes of main and side shafts, lowering the packer to the side barrel on the tubing string with the cable entry or without the cable entry and sealing of the power cable in the packer and the electric pump with the submersible electric motor, packer is installed in side string of casing pipes at specified distance from upper edge of side column of casing pipes from connection point of columns of main and side shafts with possibility of isolation of leakage point of connection of columns of main and side barrels.

EFFECT: disclosed is a method for insulation of multi-hole well leakage.

5 cl, 6 dwg