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

FIELD: construction.

SUBSTANCE: invention relates to construction and operation of wells, in particular drilling, cleaning, flushing, treatment, hydraulic fracturing, development and research. Device comprises a pipe string, a hydraulic motor with a sealed spindle, an output shaft, a near-bit sub and a bit, two packers interacting with increased pressure cavity, jet pump fed by active medium by surface pump and including nozzle connected to channel of active medium supply, diffuser with output into upper packer above-packer zone and mixing chamber connected with upper and lower packer sub-packer zone by passive medium feed channel. Two packers are made inflatable. Hydraulic motor, installed first in the direction of active medium supply, and jet pump installed by the second one, are interconnected hydraulically in series with possibility of all active medium direction after downhole motor into nozzle of jet pump, spindle seal is made combined in the form of a rubber ring installed first along the leakage path of the active medium, and two inflatable seals arranged second and interacting with the cavity of increased pressure of the jet pump. Lower hollow part of the output shaft contains a hole between two inflatable seals connected by a channel of passive medium supply to the mixing chamber. Inter-packer port for pumping of process liquid is made in spindle and is connected to channel of active medium supply. Spindle comprises a system of opening-closing of the upper inflatable packer, a passage channel of the passive medium from the sub-packer zone of the upper and lower packer and an inter-packer port for pumping of the process fluid, which is controlled via a hydraulic communication line. System is made in the form of four electromagnetic valves, control unit, pressure sensor and power supply unit. Lower packer is installed on bushing equipped with inflatable seal, which is put on external smooth side of pipe string. Bushing contains system of opening-closing of the bottom inflatable packer, in the form of the oil electric pump, control unit, differential pressure sensor, power supply unit and electromechanical lock with position sensor.

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