VALVE FOR DRAINING FLUID FROM TUBING STRING Russian patent published in 2024 - IPC E21B34/14 E21B43/12 

FIELD: oil industry.

SUBSTANCE: invention relates to oil industry, in particular, to valve devices for connection of tubing string cavity with annular space in wells operated by sucker-rod pumps (SRP). Valve for discharge of liquid from tubing string contains lower body of suction valve of closed type, on thread installed on tubing string. Lower housing of the suction valve in the upper part is connected in series to the upper housing, the coupling and the sucker-rod pump, in the lower part – to the seat holder installed between the lower housing of the suction valve and the coupling. In the lower part of the lower housing of the suction valve there is an annular groove to accommodate a shutoff element in the form of a ball, in the upper part of the lower housing of the suction valve there is an inner cavity with an annular projection. Annular groove and the inner cavity in the lower housing of the suction valve are interconnected by a channel. Inner cavity of the lower housing of the suction valve is connected to the inner cavity of the upper housing, which provides sequential arrangement of a spring, a movable bushing with upper and lower elastic seals, a rotary support and a pusher. Upper and lower elastic seals are rigidly fixed in corresponding grooves on walls of upper housing. Rotary support and pusher are made with possibility of longitudinal movement along three guides located in upper part of inner cavity of upper housing. Radial hole is made in upper housing opposite to movable bushing.

EFFECT: increased reliability of operation and multiple use of valve for discharge of liquid from tubing string.

1 cl, 7 dwg