DEPRESSION-REPRESSION ASSEMBLY FOR WELL COMPLETION AND REPAIR IN DIFFICULT CONDITIONS Russian patent published in 2019 - IPC E21B37/00 E21B21/00 E21B43/26 

FIELD: mining.

SUBSTANCE: invention relates to construction and operation of wells, in particular drilling, cleaning, flushing, treatment, hydraulic fracturing, development and research. Device includes a single pipe string, a downhole motor with a flushing channel in the output shaft, a bit-toothed adapter, a chisel, a downhole motor sub, two packers – upper and lower, interacting with the high pressure chamber, an inter-packer port for pumping process fluid, logging device, jet pump, powered by active medium by surface pump and including nozzle connected to active medium feed channel, diffuser with output to upper packer above-packer zone and mixing chamber. Packers are made inflatable, the jet pump installed first in the direction of the active medium supply, and the downhole motor are connected hydraulically with the possibility of the whole active medium direction into the jet pump nozzle located in the downhole motor sub. Downhole motor is made in form of electric drill with electric cable, flushing channel of which is connected to chamber of jet pump mixing by channel of passive medium supply. Inter-packer port is made in the downhole motor adapter and is connected to the active medium feed channel. Subsector of downhole motor includes electric-cable-controlled system of opening-closing of lower inflatable packer, channels of passive medium supply from sub-packer zone of upper and lower packers and inter-packer port in form of control unit and four solenoid valves. Upper packer is installed on bushing, which is put on external smooth side of double pipe string, introduced between adapter of downhole motor and single column with possibility of axial movement relative to bushing. Sleeve is equipped with electric-cable controlled opening-closing system of upper packer in the form of oil electric pump, control unit, differential pressure sensor, power supply unit and electromechanical lock with position sensor. Diffuser of jet pump is connected to annular space of double pipe string, having outlet through external channel of introduced additional sub into packer zone of upper inflatable packer.

EFFECT: increased value of depression per bed, increased reliability of layout in various well conditions, possibility of interval-by-interval depression-repression effect on formation.

1 cl, 5 dwg