HYDRAULIC CIRCULATION VALVE Russian patent published in 2022 - IPC E21B34/10 E21B21/10 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to construction of oil and gas wells. Hydraulic circulation valve comprises body with connecting adapters, piston has on outer surface a longitudinally made blind slot for guide pins, which are symmetrically located relative to each other and fixed on the body of the device opposite the piston with the possibility of limiting the piston movement within the slot. On the external surface of the rotary bushing there is a blind shaped slot for guide pins fixed on the body of the device. In the lower part of the hollow rod, which is rigidly connected to the rotary bushing, there are radial flushing holes with the possibility of their coaxial arrangement with radial flushing holes on the device body. Valve comprises return spring with support rings freely installed from above and from below and seals. Piston and rotary bushing are made as separate elements. Lower part of the piston has a toothed end with cone-shaped teeth for a toothed connection with the rotary bushing with the possibility of combined longitudinal and translational movement of the piston and the rotary bushing and angular movement of the rotary bushing relative to the piston. Sealing collars are fixed on the body below the rotary bushing at a distance of not less than the length L of the stroke of the hollow rod with provision of hydraulic communication between in-pipe and annular space and between in-pipe space and central through hole of the device with length of 2L of rod stroke. Rotary bushing is pressed from below by a return spring, support rings resting on a cage with sealing collars, and a lower connecting adapter with a central through hole.

EFFECT: increased reliability of the device with provision of complete flushing in the well at supply of flushing fluid by the drilling pump.

1 cl, 3 dwg