Dynamic Analysis With Research On Energy-Saving Control Strategy Of Beam Pumping Unit

At present, accompanied with the continuing exploitation of petroleum energy, Chinese oil fields have to utilize Pumping Units. So far as Pumping Unit is concerned, Rod Pumping Unit, especially Beam Pumping Unit, is the most common device, which covers a wide application range, because of its obvious merits covering simple structure, durable performance, operation convenience as well as low maintenance cost. However, its inherent demerits in eluding low efficiency, high energy waste has constrained the development of the oil industry and no longer met the need of current economical development.Serious energy dissipation in oil fields has attracted widespread research interests domestically and abroad. In the face of the world energy crisis, there is no time to wait for increasing the efficiency of oil extraction and decreasing the energy dissipation of Pumping Unit.This dissertation, on one hand, has analyzed the energy dissipation mechanism of Pumping Unit, and found the reason for the energy dissipation of Pumping Unit along with the control basis for the following design of Hydraulic Energy-Accumulation System; on the other hand, it has put forward a program on Hydraulic Energy-Accumulation System on the basis of comparative analysis of energy-saving measures which are widely used in Pumping Units now. At the same time, it has made a detailed design of the system, and put forward a control strategy. A brief summary of the chapters are as follows:Chapter 1 has briefly introduced the origin of the task and the meaning and proposes of the research. Meanwhile, it has generalized the research state on the aspects of the energy-saving of Pumping Unit domestically and abroad.Chapter 2 focuses on the Dynamic Simulation of three main parts of Beam Pumping Unit:Motor, Reducer and Main Body, by the software of SIMULINK and seeks the mechanism of energy dissipation according to relative analysis. The results provide a good basis for the sequential design of Hydraulic Energy-Accumulation System. By comparison with the measured data, it has verified the correctness of Beam Pumping Unit Dynamic Model.Chapter 3 firstly presents the scheme of Hydraulic Energy-Accumulation System; secondly, it recommends the paramount components of Hydraulic System and Mechanical System; and eventually it brings forward personal views about control strategy. All of these are based on the comparative analysis of diversified energy-saving measures of Pumping Unit.Chapter 4 analyzes the working state of motor whether it adopts Hydraulic Energy-Accumulation System at two aspects:enhancing the Load Rate of motor and improving the Balance state of the Pumping Unit, which improves the performance of the Beam Pumping Unit System, and estimates its energy-saving effect.Chapter 5 summarizes the dissertation, and proposes the follow-up research focus.