TELESCOPIC DEEP-WELL ROD PUMP Russian patent published in 2022 - IPC F04B47/00 

FIELD: petroleum industry.

SUBSTANCE: telescopic deep-well rod pump relates to the field of mechanised operation of a petroleum borehole and can be used to produce petroleum with a high content of mechanical impurities, sand, emulsion and viscous petroleum from the borehole. Telescopic deep-well rod piston pump includes a cylinder with a hollow plunger installed inside, lowered on a tubing string, an intake and injection valves. The pump is equipped with two rod-casing piston pairs - upper and lower, the upper piston pair is installed on the upper part of the hollow pump plunger, and the lower piston pair is installed in the lower part of the pump cylinder. The upper rod of the injection valve, provided with upper and lower windows, is secured to the rod string. Depending on the implementation variant, a "coupling-uncoupling" apparatus can be attached in the gap between the rod string and the upper rod, wherein the upper piston pair is installed on the movable pump cylinder, and the lower piston pair is installed on the upper part of the hollow stationary pump plunger. The upper rod is retained in the upper casing by means of the protrusions in the lower part thereof. The upper casing is connected with the reducing coupling of the upper valve, and the coupling is connected with the pump plunger. Depending on the implementation variant, the reducing coupling can be connected with the hollow stationary pump plunger as well. The hollow plunger is located in the pump cylinder and is retained by means of the protrusions in the pump cylinder, since the pump is made insertable. Depending on the implementation variant, the cylinder can be made without protrusions. The lower part of the pump cylinder is connected with the reducing coupling connected with the lower casing with windows. The lower rod of the intake valve is installed in the casing, retained therein by means of the protrusions. A spring is also located between the rod and the casing. The lower rod is connected with the locking shoe installed in the reducing coupling of the pump cylinder. Depending on the implementation variant, a hollow stationary pump plunger connected with the reducing coupling can be installed in the lower part. Said coupling is retained on the tubing string. The upper part on the pump plunger is connected with the lower casing. The lower rod of the intake valve with windows is installed in the casing, retained therein by means of the protrusions. A spring is also located between the rod and the casing.

EFFECT: pump has high operating reliability and productivity, allows for an increase in the turnaround period of the borehole; it also acts as an anti-turn coupling, excluding turning of the plunger during the operation of the rod pump; pump can be used with a long stroke of the plunger (up to 20 m or more) and while changing the operation mode of the pump.

1 cl, 4 dwg