Novel vertical mechanical reversing energy-saving pumping unit

Abstract

The invention relates to a novel vertical mechanical reversing energy-saving pumping unit. The novel vertical mechanical reversing energy-saving pumping unit is characterized in that a transmission system adopts a mechanical reversing, two-way gear drive and oil-immersed lubrication fully-enclosed reduction gearbox for realizing the positive and negative rotation of a head sheave of the pumping unit, to ensure the immense inertia of a pumping rod and a counterweight to decelerate, buffer until stop before the pumping unit runs to an upper dead point or a lower dead point, a crank buffer device is arranged so that the impact energy is smoothly absorbed and stored, the stored energy is released after passing through the upper dead point and the lower dead point, and a motor is started at an upper dead point or a lower dead point under the conditions of basically smooth input speed and torque. Through the adoption of mechanical reversing and closed oil-immersed lubrication, the adaptability of the pumping unit to the harsh environment is higher; as the motor runs in the same direction all the time, a complex electric control system is not provided, the reliability is high, and the servicing, the maintenance and the repair are simple; and the equipment is controlled to run by a PLC (programmable logic controller), and importantly, the system adopts a two-way backup, and therefore, both the reliability and the stability of the pumping unit are enhanced.

Description

technical field [0001] The invention relates to a novel vertical mechanical reversing pumping unit, which belongs to the field of petroleum exploitation. Background technique [0002] In the onshore oil production market, the rod-lifting oil recovery method is still the mainstream method. Due to the outstanding advantages of this oil recovery method, this proportion will not decrease in the foreseeable future, and the market capacity will remain the largest. [0003] The pumping units used in this oil extraction process are mainly divided into two categories: [0004] 1. Beam pumping unit [0005] Beam pumping unit, commonly known as "kowtow machine", is a traditional pumping equipment widely used in oilfields, 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 t...

AI Technical Summary

Problems solved by technology

[0015] 1) Large volume and weight, waste a lot of steel;

[0016] 2) The operation process consumes a lot of energy, and as the electricity price continues to rise, the cost of oil production is high;

[0017] 3) Long-stroke operations cannot be realized

[0018] 4) Low-production oil wells cannot meet production requirements;

[0019] 5) In the late stage of water injection oil field, it cannot meet the production requirements

[0022] 1) The reversing mechanism is bulky, has many parts, complex structure and high cost

[0023] 2) The lubricating system is semi-open, with weak resistance to external environment pollution and erosion, and the lubricating effect is unstable.

[0024] 3) It is difficult to maintain and replace, and after wear and tear, vibration and noise will be generated, which will further reduce the cushioning effect, deteriorate the use of the whole machine, and pose a great safety hazard

[0025] 4) After the belt is used to replace part of the steel wire rope, although the cushioning and noise are improved, the belt has high cost, short life, difficult replacement and maintenance, and is more sensitive to harsh environments such as wind, sand, and cold, and is greatly restricted in use.

[0026] 5) Unable to achieve unequal speed matching of uplink and downlink

[0027] 6) The controllable stroke cannot be adjusted

[0029] 1) Using complex electronic control technology, poor reliability, not suitable for harsh environments

[0030] 2) Frequent start-up of many motors results in high energy consumption

[0031] 3) Due to the large fluctuations in working conditions, the frequency converter, motor, and transmission belt are seriously heated, and the service life is short

[0032] 4) The high frequency generated by the inverter will interfere with the power grid

[0033] 5) Difficult to repair faults and high maintenance costs in the later period

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