Research On Design And Lifting Performance Of Metal-Rubber Compound Rotor Single Progressive Cavity Pump

Oil production progressive cavity pump,as an important artificial lifting method,has been widely used in oilfield exploitation,and has the advantages of strong adaptability,high efficiency and simple structure.At present,the oilfield is commonly used rubber stator progressive cavity pump,because the rubber stator is easy to damage,when the maintenance and replacement of the stator,the rod and pipe must be put forward to the well,resulting in long operation time and high cost.In view of above problems,the rubber stator of the progressive cavity pump is changed to metal stator,the metal rotor is changed to metal-rubber compound rotor,the main cause of the failure of the progressive cavity pump is transferred to the metal-rubber compound rotor,reduce the operation time and cost.Therefore,this paper will analyze the structure and lifting performance of metal-rubber compound rotor single progressive cavity pump,study the influence of different structural parameters on lifting performance,and lay the foundation for the design of new progressive cavity pump,application research.Based on the principle,structure and linear theoretical basis of the progressive cavity pump,explore the seal principle and the internal pressure transfer law of the progressive cavity pump,and complete the design of metal-rubber composite rotor.Aiming at the metal-rubber composite rotor,the design of equal wall thickness rubber layer rotor was adopted to optimize the section shape of metal-rubber composite rotor,so as to increase the contact area and improve the bonding strength,and verify the bonding strength of rubber layer.Based on practical operating conditions of the progressive cavity pump,the ANSYS software is used to create the finite element model of the metal-rubber composite rotor single progressive cavity pump,and the contact stress of the seal belt of the progressive cavity pump is analyzed.Through the sealing principle of progressive cavity pump,determine the leakage of sealing belt,and this leakage sealing belt to explore the seal and leakage of the progressive cavity pump.In the finite element model of the progressing cavity pump,the critical contact stress of the progressing cavity pump under different pressure differences was calculated,and the relation polynomial of the critical contact stress and the pressure in the low pressure cavity was obtained by fitting.The pressure transfer law of progressive cavity pump was analyzed and the lifting pressure calculation method was derived.The lifting pressure of metal-rubber compound rotor single progressive cavity pump was calculated,and the lifting pressure was compared with that of conventional progressive cavity pump.Using the numerical simulation method,the parameters of the progressive cavity pump such as rubber layer thickness,initial interference,eccentricity and lead were taken as the research object.The finite element model of the metal-rubber compound rotor single progressive cavity pump with different structural parameters was calculated and analyzed.The critical contact stress and single stage lifting pressure were obtained respectively.The influence of the above four structural parameters on the lifting performance of the metal-rubber compound rotor single progressive cavity pump is studied.