Downhole sucker rod pumps for the extraction of viscous oil

摘要

The present utility model relates to oil industry, particularly, to well sucker rod pumps used for lifting the viscous oil to the surface. The pump comprises a cylinder with a valve seat associated upper part with a column of tubing, a plunger disposed in the cylinder to form the above-plunger chamber and coupled to the rod string, having a stop, the discharge valve movably disposed on the column rods between the anvil and the plunger and a formed annular, with a diameter greater than the diameter of the plunger, the suction valve communicating with a downhole plunger chamber space, and the spring-loaded restrictor upward stroke of the discharge valve. The plunger is hollow. The suction valve is equipped with a pusher rigidly connected to the rod string and inserted into the plunger to move longitudinally bounded above by an outer projection of the pusher, and bottom - the intake valve overlapping the cavity by moving the plunger upwards. The injection valve is provided with the auxiliary cylinder of smaller diameter rods and the column - additional plunger of smaller diameter inserted into the auxiliary cylinder to seal a reciprocating plunger in the course of the cylinder. Proposed downhole rod pump for a viscous oil reliable in operation due to the force of closing and opening the discharge and suction valves, and because of the use of additional piston and cylinder for sealing the movable connections, easy maintenance, and by raising the possibility for the repair and / or service only plunger with all valves and stop the course and can be used when working in wells with a complex profile. 2 yl.