Energy-saving type oil pumping unit with balance automatically adjusted by liquid

Abstract

The invention relates to an energy-saving type oil pumping unit with balance automatically adjusted by liquid. The energy-saving type oil pumping unit comprises an oil pumping unit base, a bracket, a bracket shaft, a walking beam, a speed reduction box, a crank, a balance weight, a connecting rod, a tail shaft, a distribution box and a driving motor. The energy-saving type oil pumping unit is characterized in that the tail part of the walking beam and the bracket are respectively provided with a balance adjusting water tank (1) and a water storage tank (8); the water tanks are respectively provided with a water reducing pump (2) and a water adding pump (9) inside and are communicated with each other through a water adding pipe (2) and a water reducing pipe (4); according to the balance condition of the currents of the up and down strokes of the oil pumping unit, a control box (12) arranged on the distribution box can automatically control the water pumps to add or reduce water for the balance adjusting water tank in a set working way so as to enable the ratio of the effective peak currents of the up and down strokes of the oil pumping unit to be always kept over 5%, and therefore the automatic balance adjustment of the oil pumping unit is realized; and the scheme is suitable to not only newly manufactured oil pumping units but also upgrading and improvement of the existing oil pumping units.

Description

(1) Technical field: [0001] The invention relates to an oil pumping unit in the field of oilfield mechanical oil extraction, more specifically an energy-saving oil pumping unit for liquid automatic leveling. (2) Background technology: [0002] Because of its reasonable structure and reliable operation, the beam pumping unit is widely used in various oil fields, but it also has some disadvantages, such as difficulty in leveling, potential safety hazards, and the need to stop the leveling, which affects the normal production of oil wells Wait. In addition, the Chinese Patent Application No. 02204431 also discloses a "balance and energy-saving device for pumping units". This solution is to install a liquid storage tank before and after the beam of the pumping unit, and an infusion fluid is installed between the two tanks. The pump, pumping water back and forth, makes the head of the pumping unit heavier at the front when moving downward, and heavier at the back when moving upw...

AI Technical Summary

Problems solved by technology

It should be said that this technology has made great progress compared with the original technology, but it still has some unsatisfactory places. For example, each stroke needs to pump water back and forth, and the working frequency is too high, which affects the pump and system. The working life will be adversely affected, especially the pumping power required for high-frequency back-and-forth pumping will be large, which may be higher than the price paid for energy saving, so its practicality will be greatly limited

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