FIELD: oil and gas industry.
SUBSTANCE: coupling comprises a housing with inner trapezoidal grooves, a movable element in the form of a pipe with a mating protrusion of trapezoidal shape on the outer surface and a seat for placement of the ball inside, a port for hydraulic fracturing, a ball activating the movable element, a hollow piston with holes and a supporting spring mounted in the cavity under the piston. The movable element is made without a hole and is provided with two protrusions of trapezoidal shape on the outer surface and one seat. The seat is located between the protrusions of trapezoidal shape.
EFFECT: increase in reliability of fixing of the movable element in the housing of the device, and improvement of quality of processing of the borehole due to improvement of the system of opening ports.
2 cl, 3 dwg
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