Load Reduction Mechanism and Laboratory Experiment of Elastic Damping Beam Hanger

Abstract

Polished rod load is an important basis for the design and selection of pumping units. Due to the elastic action of slender sucker rods, the maximum and minimum values of the suspension load increase and decrease, resulting in the increase of the power of pumping units or the increase of pumping units. Firstly, the mathematical model of suspension dynamic load of beam pumping unit is established, the mechanism of damping on suspension dynamic load is analyzed; a metal spring suspension is designed and hysteresis characteristic test is carried out. The laboratory experiment of metal spring suspension is carried out on the pumping unit test bench. The results show that the maximum polished rod load and dynamic load are reduced by adding metal rubber element. The maximum load reduction rate is about 10%. With the increase of the relative density of metal rubber, the maximum polished rod load decreases and the dynamic load reduction rate decreases under the same pumping stroke. Therefore, the elastic damped suspension can effectively reduce the maximum suspension load and alternating load, which has important engineering practical significance for energy-saving exploitation and improving the operation conditions of pumping units, and provides a new idea for the application of pumping units in deep wells.