Research And Application Of The Flexible Mechanism On Beam Pumping Unit

Conventional beam pumping unit is the most widely used in the production of oil field. It has been used for hundreds of years. With the oilfield development and the surge in demand for oil from all over the world, conventional beam pumping unit has been unable to meet the needs of oilfield. Therefore, optimize and improve the structure of the conventional beam pumping unit, and design new type beam pumping unit that has better athletic performance and dynamic performance is very necessary.First of all, complete the kinematics and dynamics analysis and calculation for the rigid mechanism pumping unit. The results show that the rigid mechanism pumping unit has defects on structure, that lead to the energy consumption is too huge and low working efficiency of pumping unit. Therefore, designs the flexible component and flexible four-bar linkage, and apply it to the structure optimization design of pumping unit, to replace the rigid structure of end bearing assembly. In the end, the well balance performance and better energy saving effect of flexible mechanism pumping unit appeared.Secondly, according to the geometric relationship and component moving characteristic of flexible mechanism pumping unit, analyzes the characteristic of kinematics and dynamics of the flexible mechanism pumping unit, and by the calculation the main performance parameters of the date are obtained. By comparing and analyzing the various performance indicators of two kinds of pumping unit. The results show that, under the same working condition, the maximum acceleration of flexible mechanism pumping unit is less than the rigid mechanism pumping unit. And the range reduced makes the pumping unit dynamic load decrease and working life improve. Reflect a good sport performance of flexible mechanism pumping unit. Since the torque curve of flexible mechanism pumping unit changes gently and no negative torque, makes the work efficiency improved.Finally, establish a virtual prototype model of rigid mechanism and flexible mechanism pumping unit. Under the same working conditions of oil wells, using the ADAMS software, complete the multi-body dynamics simulation analysis of rigid mechanism pumping unit and flexible mechanism pumping units. The results show that, relative to the rigid mechanism pumping unit, the stress of bearing bridge and donkey head and crankpin are all reduce. Due to structural changes, so that the forces of the main components of the pumping unit have been improved and work efficiency and service life of machine increased. In conclusion, flexible mechanism pumping unit with high development and utilization value, suitable for further use in oil field.