Research On Internal Flow Field Analysis And Structural Parameter Improvement Of All-metal Single Screw Pump

Progressive cavity pump is a kind of rotary volumetric pump,which is widely used in the exploitation of high viscosity viscous oil.However,the harsh environment in down hole can cause the rubber to swell and expansion easily,which reduce the operating life of the stator.With the rapid development of the heavy oil thermal recovery process,how to make the progressive cavity pump withstand high temperatures has become a problem that puzzles scientific researchers.With the deepening understand of the internal leakage principle of the progressive cavity pump,the researchers discovered all metal progressive cavity pump that withstands high temperatures,which stator material changed from rubber to metal and it is clearance fits with rotor,this outstanding advantage has prompted major oil service companies and research institutes to increase research on progressive cavity pumps.Due to the complexity of the space structure of the all-metal progressive cavity pump,the two-dimensional model is often used to replace the three-dimensional model in the initial stage of numerical simulation,the calculation results often have large deviations from the actual situation.In the three-dimensional numerical simulation,due to the complexity of the rotor motion,the transient process is often transformed into a static process.This method cannot describe the distribution of the pump flow field completely and accurately because the rotor has no rotational speed.In view of the above problems,this paper carried out numerical simulation of three-dimensional transients of an all metal progressive cavity pump,and conducted a more in-depth study to improve the flow field stability and performance of all metal progressive cavity pump,this paper mainly carries out the following research work:(1)Build a 3D model based on the structural parameters of JSLGB130,refer to the previous experience of numerical simulation to set the boundary conditions,the numerical simulation results are compared with Gamboa’s test data and compared to verify the correctness of the model boundary conditions.(2)Through numerical simulation analysis of the effects of medium viscosity,rotor speed and single-stage boost value on the internal flow field and performance of the all metal progressive cavity pump,the factors that have a great influence on the stability and performance of the flow field in the pump are summarized.(3)The influence of the clearance value,eccentricity and stator lead on the internal flow field and performance of the all metal progressive cavity pump was analyzed by numerical simulation,and the leakage mechanism of the pump was further explored,exploring the influence of structural parameters on internal flow field and performance of all metal progressive cavity pump(4)Based on the analysis of the effect of operating parameters and structural parameters on the pump,it is suitable for two designs of heavy oil thermal recovery and cold recovery,and numerical simulation analysis of the two options.