FIELD: mining.
SUBSTANCE: invention relates to operation of wells, in particular, to treatment and development during construction or repair thereof and can be used to increase efficiency of extraction of hard-to-recover hydrocarbon reserves in complex geological and process conditions. Method of hydrodynamic impact on formation includes lowering on the face of the layout in the form of pipe string, body with central stem of active medium supply, shank with two upper and lower packers. Method comprises insulation of formation with two packers with installation in inter-packer interval of shank, activation of flushing of well with working pressure of active medium injection, feeding jet pump nozzle with active medium with its outlet through diffuser into above-packer zone of upper packer and creation of depression in inter-packer interval. Active medium flow switch is switched from the jet pump to the shank and back to create depression and repression cycles. Pumping is injected into slaughter in cycles of depression and pumping to bed in cycles of process fluid repression. Pressure and pressure pulses are generated in cycles of depression and treatment of formation with concentration of energy. At that, during the assembly lowering along its entire length the in-tube wire line is organized by embedding, dropping into the layout and joining to each other of the cable sections. First, in the depression cycle, the permeability of the bottomhole zone in the inter-packer interval is leveled and controlled by the wire line with packs of cavitation-shock pulses with simultaneous pumping of the formation fluid. Note here that packs of cavitation-percussion pulses are generated under conditions of controlled opening-closing of active medium flow in central borehole. At that, shank is moved in inter-packer interval along depth with concentration of cavitation-shock pulses energy in lower part of shank radially to formation surface. At each depth in real time and in accordance with the measured at this depth reaction and characteristics of the formation, the treatment intensity is controlled by changing the frequency and amplitude of the cavitation-percussion pulses packets, as well as process processing parameters. After equalizing and increasing permeability of the bottomhole zone in the repression cycle, the process fluid is uniformly distributed throughout the inter-packer interval with higher injectivity. At that, periodic pressure pulses controlled by wire line are used, which are generated under conditions of controlled opening-closing of active medium flow in jet pump diffuser. Device for method implementation comprises arrangement in form of pipe string, shank with inner channel, upper and lower packers and located between shank and tubing string housing of jet pump with central stem of active medium supply, connected thereto by nozzle, diffuser with output into above-packer zone of upper packer, mixing chamber with passive medium supply channel and active medium flow switch. At that, shank in its lower part contains cavitator with radial nozzles, lower through hole and shutoff valve with forced opening. Cavitator is connected by electromechanical locks with upper and lower packers.
EFFECT: increasing amplitude of processing pulses, increasing productivity and injectivity of wells, as well as reliability of the device and enabling processing of heterogeneous low-permeable formations.
2 cl, 6 dwg
