While-swinging counterweight device for beam-pumping unit

Abstract

The invention provides a while-swinging counterweight device for a beam-pumping unit. The while-swinging counterweight device comprises a counterweight support, a ball screw, a driving device, a component force mechanism, a swinging mechanism and a controller, wherein the counterweight support is mounted at the tail end of a walking beam body, the ball screw and the driving device are mounted on the counterweight support, the component force mechanism is locked on the ball screw, the swinging mechanism is mounted on the component force mechanism in a hung mode, and the controller is used for controlling starting / stopping of the driving device. By mounting the swinging mechanism, motoring torque in the oil pumping operating stroke process can be balanced, thus oil pumping motion of the pumping unit is more stable, and the oil pumping efficiency of the pumping unit is higher; and when the down-hole load is increased, the controller controls the rotating speed and the rotating direction of the driving device so as to drive the ball screw to rotate, then the component force mechanism and the swinging mechanism are driven to transversely move along the counterweight support to balance the changed torque, and finally system balance is achieved.

Description

technical field [0001] The invention relates to the technical field of oilfield production equipment, more specifically, to a pendulum counterweight device for a beam pumping unit. Background technique [0002] The pumping unit is a kind of oil production equipment widely used in oil fields. Its working principle is: through the motor and the reducer, the donkey head set on the oil beam is driven to make it reciprocate up and down, so as to realize the oil pumping action. However, the long-term operation of the pumping unit causes wax and minerals to adhere to the wall of the downhole tubing, which causes the pumping unit to be overloaded, making it difficult to maintain a good balance of the pumping unit. During the process of oil well flushing, the load of the pumping unit will also change due to the change of the dynamic fluid level in the downhole. If the balance of the pumping unit cannot be adjusted in time, the pumping effect will be affected. [0003] In the prior a...

AI Technical Summary

Problems solved by technology

from figure 2 It can be seen that within one operating stroke cycle of the pumping unit, the moment of the counterweight at the end of the beam varies in a large range and is an unsmooth curve. It can be seen that the method of installing the counterweight 01 at the end of the beam , the balance effect is not obvious

In addition, since the distance between the counterweight 01 and the fulcrum is constant, once the bottom hole load changes, the counterweight 01 cannot effectively balance the changing moment, thereby affecting the working efficiency of the pumping unit

Images