WELL SUCKER-ROD PUMP Russian patent published in 2011 - IPC F04B47/00 

FIELD: engines and pumps.

SUBSTANCE: well sucker-rod pump comprises a cylinder with a valve and a seat lowered down at tubing, a hollow plunger with its valve arranged in the cylinder and forming a suction cavity in it. Rods with the plunger are joined with the help of a pusher with a stop at the top on the outer surface. The valve seat is arranged on top of the cylinder and is made with the outer diameter, which is less or equal to the inner diameter of tubing and with inner diameter, which is higher or equal to the inner diameter of the cylinder. The valve of the cylinder serving as the injection one is made in the form of a hollow bushing placed above the stop at rods higher than the pusher with the possibility of tight longitudinal displacement and tight interaction with the seat at the top. The bushing is made with sufficient weight for longitudinal displacement along the rod down in the well fluid under its own weight, and the suction cavity of the cylinder is arranged above the plunger, the valve of which is arranged as suctioning. The pusher stop is arranged with the possibility of interaction with the bushing as the plunger lowers down into the well and during its withdrawal from the cylinder.

EFFECT: pump makes it possible to work with higher efficiency factor, with viscous well fluids and with fluids containing paraffins, and resins, also with highly carbonates fluids, is simple and cheap to make, maintain and repair, since it does not require lifting the cylinder with tubing from the well at the same time.

4 dwg, 4 cl