Finite Element Analysis and Application of a Chain Pumping Unit Frame

The rack is a key supporting part of a chain pumping unit. Its reliability and the service life directly affect the performance of the pumping unit. Considering the working load status of the frame, the authors have applied the SolidWorks software to develop a 3D model of a 600 broadband chain-reversing pumping unit. The ABAQUS software is adopted to calculate and analyze structural strength of the frame and the stress and strain distribution under the action of the suspension point load and the balance box load. Besides, the stress concentration and the dangerous section position of the frame are obtained to verify the rationality of the closed frame structure. Moreover, modal analysis of the frame is conducted to obtain the displacement response characteristics of the frame to different frequency loads. The research results provide scientific guidance and reference for the optimized design and safe exploitation of the frame. The application practices in the mineral field of the Shengli oil field in eastern China have shown that the optimized chain oil-pumping machine has a reduced failure rate and an extended life span. Also, it meets the working requirements of the long stroke and low-stroke times for heavy oil, high viscous oil, and low osmotic depth wells. Besides, it provides a higher average load utilization than the beam oil pumping machine and has low energy consumption in the development of high oil, high viscous oil, and low osmotic depth wells.