SUCKER-ROD PUMP WITH POSSIBILITY OF DIRECT FLUSHING (VERSIONS) Russian patent published in 2020 - IPC F04B47/00 

FIELD: oil industry.

SUBSTANCE: invention relates to oil producing industry, in particular, to downhole sucker rod pumps operating both in vertical and directional wells. Pump comprises cylinder, hollow plunger arranged in cylinder cavity, suction and discharge valves installed in cylinder and plunger cavities, respectively, including housing with ball and seat, pusher arranged to raise the ball valve during lowering the plunger below the lower dead point and actuating the suction valve ball movement mechanism. According to the first version, the suction valve body is made with ball guides excluding its lateral movement and windows. Mechanism of the suction valve ball movement is made in the form of a collet, which is put on the suction valve body, with the possibility of limitation of movement downwards. Collet lugs are arranged in the openings and in the lower part are made with external projections and internal ones - in the form of a wedge interacting with the ball between its larger in the plane perpendicular to the valve axis, circle and saddle. On the suction valve body and the collet the rocket is put upside down, the bottom of the shell is rigidly connected to the pusher, the side surface of the shell is made with openings for liquid, and the lower end of the shell walls is made with an internal conical surface interacting with external conical projections of petals of the collet, wherein barrel bottom is spring-loaded upward relative to suction valve body. According to the second version, the suction valve body has guides on the inner surface and a partition wall with holes limiting the ball axial movement. Mechanism of movement of the ball of the suction valve is made in the form of a spring-loaded down grip, the housing of which is rigidly connected to rods made with projections on the lower end, and the grip housing is made with possibility of interaction through the lever and the foot with the pusher with spring-loaded upwards.

EFFECT: simplified design and increased reliability of operation.

2 cl, 5 dwg