Abstract
Some components in Double horse head (DHH) pumping unit may occur cracking failure due to high cycle alternating stress, and this makes the research on dynamic stress simulation for them more interesting topic in its maintenance operation. This paper aims to improve the accuracy of dynamic stress simulation model through a parameter optimization method for the cable joints in DHH pumping unit. A series of cylinders was employed to model the steel cable, and the back horse head was also transformed to flexible body, then a rigid-flexible multibody dynamics model with cable was constructed to simulate the dynamic stress of components in DHH pumping unit. Stiffness and damping coefficient in cable joints have a significant effect on the model performance, and an unreasonable value may cause a strong vibrational and undesirable model response, therefore, a Memetic Algorithms based method was proposed to optimize them for improving the simulation accuracy using tested stress as objective function. Results show that the dynamic stress simulated from improved model is much closer to the experimental test compared with the original model, and these optimized parameters are also valid for the model in other working condition.
Highlights
Artificial lift beam pumping unit is widely employed to extract oil on most wells all over the world, and more than 70 % of the beam pumping units is the conventional type [1, 2]
Taking the stress simulation of key components in Double horse head (DHH) pumping unit as a special example, this paper presents an approach to optimize parameters of the joint for cable in order to increase the accuracy of multibody dynamic model
We choose one test point from each pin, and the model experimental tested dynamic stress of point 1 and point 3 were shown as blue line in Fig. 7(a) and Fig. 7(b) respectively
Summary
Artificial lift beam pumping unit is widely employed to extract oil on most wells all over the world, and more than 70 % of the beam pumping units is the conventional type [1, 2]. The DHH pumping unit, which was designed by a variable parameters four-bar mechanism, is an improved beam pumping unit, and it can settle the dead angel problem in conventional type and has the characteristics of long stroke. There still exists some remain unbalanced crank torque, and it may cause high cycle alternating stress which lead to cracking failure of some key components such as cracks in area connecting walking beam and back horse head. This makes the stress simulation and analysis for key components of beam pumping units more interesting topic in its maintenance operation. Larrainzar [5] has presented an analysis of the fatigue crack growth and the corresponding residual life evaluation of the walking beam in an oilfield pumping unit
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