Fully automatic hydraulic oil pumping unit with double cylinders connected in parallel

Abstract

The invention relates to a fully automatic hydraulic oil pumping unit with double cylinders connected in parallel. The fully automatic hydraulic oil pumping unit comprises a vertical derrick, a hydraulic transmission system, a mechanical transmission mechanism composed of a well-hanging traction pulley block and a counterweight traction pulley block, a counterweight device, a well hanging device, a kinetic energy recovery and utilization device and an automatic control system, and is characterized in that the hydraulic transmission system comprises a constant-power variable-displacement pump serving as a power input element, a hydraulic oil cylinder I serving as a power output element, a hydraulic oil cylinder II serving as another power output element, and the like; the mechanical transmission mechanism is two groups of accelerating pulley blocks; the kinetic energy recovery and utilization device is two groups of elastic energy storage devices, and each group of elastic energy storage devices consists of an elastic energy storage device I, an elastic energy storage device II and an elastic energy storage device III. The fully automatic hydraulic oil pumping unit provided by the invention has the advantages that the requirements of users for a large-stroke and low-stroke frequency oil pumping unit of 8 m or above are met, the stroke and the speed of each oil cylinder are lowered reduced by four times, the strengths and the service lives of the oil cylinders as well as pipes and rods are improved, and the efficiency of an oil-well pump is improved.

Description

Technical field [0001] The invention belongs to the technical field of oilfield oil extraction equipment, and particularly relates to a dual-cylinder parallel fully automatic hydraulic pumping unit. Background technique [0002] At present, in the oilfield mining industry, the main mining equipment is beam pumping unit and a few tower pumping units. Although beam pumping unit has the advantages of simple structure, convenient maintenance, and strong field adaptability. But it is determined by the characteristics of its mechanism; its transmission efficiency can only reach 25.96%, and it lacks automatic control functions, and has a tendency to be gradually eliminated in the industry. Tower type pumping unit, especially tower type fully automatic hydraulic pumping unit, it solves the technical problems of beam pumping unit high energy consumption, low efficiency, lack of automatic control function, and increases the stroke and reduces the stroke , Improve the efficiency of the oil...

AI Technical Summary

Problems solved by technology

The tower pumping unit, especially the tower-type fully automatic hydraulic pumping unit, solves the technical problems of high energy consumption, low efficiency and lack of automatic control function of the beam pumping unit, and increases the stroke and reduces the number of strokes , improving the efficiency of oil well pumps, so the demand is increasing year by year

However, with the continuous development of oil extraction technology, users have more and more demands on the stroke, generally requiring 6-8m, and some require 10m, so that the single-cylinder tower hydraulic pumping unit cannot meet user requirements

According to the cylinder stroke design standard; the 140kN hydraulic pumping unit adopts a double-acting cylinder with piston D=90mm and piston rod d=63mm. The maximum allowable stroke is 2740mm. The stroke is 5.48m, which cannot meet the requirements of the pumping unit with a stroke of 8m or more. Moreover, the stroke of the oil cylinder is large and the speed is fast, which directly reduces the service life of the oil cylinder

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