Super-long-stroke oil extraction pump

Abstract

The invention discloses a super-long-stroke oil extraction pump which comprises pump cylinders, a plunger, a valve seat and tubing couplings. A plunger oil outlet valve and a pump cylinder oil inlet valve are arranged at the two ends of a piston in the pump cylinders respectively, the overall length of the pump cylinders of the super-long-stroke oil well pump is larger than 50 m, the super-long-stroke oil well pump is formed by connecting five or more pump cylinders, the length of each pump cylinder I or each pump cylinder II is larger than or equal to 10 m, the pump cylinders are in threaded connection through pump cylinder couplings, it is guaranteed that the inner diameter concentricity error generated after every two pump cylinders are connected is not larger than 0.02 mm, the concentricity error of the thread axis and the pump cylinders is not larger than 0.02 mm, a spraying welding plunder is adopted as the plunger, the length of the sealing face of the plunder is larger than or equal to 1.5 m, and the matching clearance between the plunder and the pump cylinders is the first-level clearance of 0.03 to 0.07. The one-time investment of the super-long-stroke oil extraction pump is small, the extraction quantity is improved, the pump efficiency ratio is high, the energy saving effect is obvious, and use is convenient. The super-long-stroke oil extraction pump is suitable for being used in oil fields of various conditions.

Description

technical field [0001] The invention relates to the technical field of oil extraction, in particular to an ultra-long-stroke oil extraction pump. Background technique [0002] Beam pumping units, oil-free beam pumping units and screw pumps are widely used in oil extraction, but screw pump oil extraction is suitable for shallow wells, oil wells with relatively thick oil and high sand content, and the process requirements are relatively high. The beam pumping unit refers to a pumping unit that contains a beam, is reversed through a connecting rod mechanism, and is balanced by a crank weight, commonly known as a "kowtow machine". It is usually directly driven by an ordinary AC asynchronous motor. Its crank belt drives the sucker rod with counterweight and balance weight, and drives the downhole oil well pump to do up-and-down reciprocating motion in a fixed period, so as to send the downhole oil to the surface. In one stroke, as the sucker rod rises / falls, the motor works...

AI Technical Summary

Problems solved by technology

It cancels the traditional oil pump, and actually uses the oil rod as the pump barrel. Because the oil rod is very long, the processing quality is difficult to guarantee, and the leakage is serious during the oil pumping process, and it still uses the traditional oil beam pumping unit. The motor used is still a large horse-drawn cart, and it is difficult to maintain and the cost is high

Chinese Patent No. CN103670339A discloses a "belt and wire rope combined traction digital energy-saving pumping unit", which actually relies on the positive and negative rotation of the motor to drive two sets of belt transmission systems to pull the piston, the stroke of the pump is still limited, and the pump efficiency ratio not improved much

There is also a utility model patent named "an automatic intermittent oil pumping device", the patent number is 200620147780.3), which also relies on the positive and negative rotation of the motor to pull the piston, and the stroke of the pump is still limited

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