Double-chain reversing oil pumping method and oil pumping unit

Abstract

The invention discloses a double-chain reversing oil pumping method and an oil pumping unit using the method. The method includes the following steps that step 10, rotational motion of a motor is output through two shafts driven by a speed reducer; step 11, the two shafts drive a reversing mechanism to form long ring continuous motion through transmission of chains; step 12, the reversing mechanism drives a shuttling frame to move up and down, the shuttling frame drives a traction belt to move up and down, and thus a sucker rod is driven to make reciprocating motion vertically. The invention further comprises the double-chain reversing oil pumping unit. The oil pumping unit comprises a base and a tower arranged on the base. A first belt roller and a second belt roller which are parallel with each other are arranged on the top of the tower, two sets of lower chain wheels and two sets of upper chain wheels are arranged on one side of the tower, the traction belt is connected to the upper portion of the shuttling frame, and the traction belt stretches to the other side of the tower through the first belt roller and the second belt roller. The oil pumping unit has the advantages of being simple in structure, low in cost, high in efficiency, convenient to use, stable in reversing, safe, high in efficiency and the like.

Description

technical field [0001] The invention relates to a pumping unit and method for oil recovery in an oil field, in particular to a double-chain reversing oil pumping method and the pumping unit. Background technique [0002] At present, the chain-belt pumping unit is a low-stroke, long-stroke, and heavy-duty surface oil production equipment that can meet oil wells in various working conditions. It has the characteristics of high efficiency, safety, reliability, and energy saving. There are a wide range of applications. At present, there are many belt pumping units with single-chain transmission in the market. With single-sprocket transmission, under the drive of the motor, the sprocket drives the chain to make a circular circular motion, and the commutation is realized through special chain links. Reciprocating up and down, this reversing structure is easily damaged. In addition, the lifting force of the single chain pumping unit to support the counterweight box deviates from t...

AI Technical Summary

Problems solved by technology

At present, there are many belt pumping units with single-chain transmission in the market. With single-sprocket transmission, under the drive of the motor, the sprocket drives the chain to make a circular circular motion, and the commutation is realized through special chain links. Reciprocating up and down, this reversing structure is easily damaged. In addition, the lifting force of the single chain pumping unit to support the counterweight box deviates from the center of gravity of the counterweight, which will generate a pair of force couples PR in the vertical plane, resulting in the inclination of the counterweight box. Increase the load of the centering wheel, so that the centering wheel is often worn due to extrusion, which increases the failure maintenance rate. Another potential hidden danger of single chain transmission is the increased risk of fatigue damage to the equipment. On the chain link shaft, additional stress is generated. Since the special chain link must perform lateral periodic movement between the two chains when the reciprocating frame reverses up and down, the additional stress is an alternating stress. When the lifting force passes through the center of gravity of the counterweight, the additional stress is zero, when the lifting force passes through the center line of the chain, the additional stress is the largest

Since the shaft diameter of the special chain link is less than 100mm, the impact of the additional alternating stress is relatively large, and the stress of the next motion cycle changes four times, so the impact on the fatigue damage of the special chain link is quite large, and it has become a guarantee for equipment safety. a hidden danger

After the single chain pumping unit has been in operation for two years, the side centralizing wheel is squeezed and damaged, the guide rail surface of the column is worn through, and even the centering wheel is damaged and the side of the column (that is, the guide rail surface) is worn through.

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