Type Test Research And Design Optimization Of A Drum Pumping Unit

With the continuous deepening of oil exploration,the current situation of highviscosity heavy oil wells and deep oil wells has gradually emerged,which has led to a sharp increase in the difficulty and cost of mechanical oil extraction.The problem of low efficiency and high energy consumption of conventional pumping units has become increasingly prominent.Combined with the new measures of energy saving and consumption reduction in China,it is of great significance to study the new pumping unit to reduce the cost of oilfield development and promote the development of energy industry.In recent years,new oil production technology has been put forward by researchers,and various new types of pumping units have become more and more.However,due to the complexity and diversity of oil fields,as well as the special working load of pumping units and the complex and harsh operating environment,there are relatively few new models that can be truly popularized and put into use in oil fields.Therefore,it is necessary to study the development design and indoor type test of the new pumping unit.In this paper,the indoor type test of a roller pumping unit is studied,and the balance weight system and pumping stroke of the machine are designed and optimized.First of all,in view of the high failure rate,short life of the whole unit,and low energy efficiency after the new pumping unit is put into use in the oil field,a prototype of a non-circular gear train reversing drum pumping unit is used as the research object.By verifying the performance of the whole machine and the reliability of the core components,a type test method with similar laws as the oilfield indicator diagram is proposed,which provides a new idea for the indoor type test of the newly designed pumping unit.Secondly,combined with the structure and operation mechanism of the drum pumping unit,based on the drum of the pumping unit,a kind of elastic double-claw rodent ratchet mechanism which only transmits single direction and large torque is designed,and a double balance counterweight energy saving system combining mechanical counterweight and ratchet mechanism is proposed.The mechanical counterweight is used as the auxiliary counterweight to balance the sucker rod,and the ratchet mechanism is used as the main counterweight.At the same time,the hydraulic pump and motor accumulator technology are combined to realize the balance adjustment and energy recovery of the pumping unit.The design method and results provide a feasible scheme for the modification and upgrading of the roller pumping unit and energy saving.Finally,based on the theoretical analysis of the pumping unit type test results,taking ’ long stroke and low stroke ’ as the optimization goal,the key factors affecting the stroke of the pumping unit and the necessity of long stroke are analyzed.Combined with the principle of non-circular gear train reversing system,the optimization scheme of the reversing system is determined,and the three-dimensional models before and after optimization are established.Through the comparison of motion simulation results,the rationality and reliability of the design optimization are verified,and the overall performance of the non-circular gear train reversing roller pumping unit is better improved.Through the above theoretical research and design and optimization,the theoretical method of the indoor type test of the new pumping unit is improved,which further promotes the field test of the pumping unit and the large area application in the later stage.At the same time,the reliability of the whole machine is verified,and it has the unique advantages of long stroke and low stroke,which provides a new direction for solving the problem of difficult development of complex oil and gas fields.