Influence of Rotation Speed of Screw Pump on the Flow Field Characteristics of Oil-Water Cyclone Separation Pipe
The cyclone separator would experience complex vibration under the action of downhole oil recovery screw pump,which has a certain impact on the internal flow field of the cyclone separator.In order to study the changes in the internal flow field of the cyclone separator under different rotation speeds of the screw pump,taking the cyclone separation string under the action of the screw pump in the injection-production technology of the same well as the research object,based on the structure and working characteristics of the vibrating wall cyclone separa-tion string,the computational fluid dynamics method,the computational solid mechanics method and the fluid-sol-id coupling theory,a fluid-solid coupling mechanical model was built.Then,the fluid-solid coupling analysis method was used to analyze the flow field characteristics such as velocity field,oil distribution,vorticity and tur-bulence energy inside the downhole cyclone separation string under the rotating conditions of two-screw pump.The analysis results show that as the rotation speed of the screw pump increases,the tangential and axial velocity inten-sities inside the separator gradually decrease,the asymmetry of radial velocity gradually aggravates,and the cyclic variation of rotation speed would also cause a migration of radial velocity field distribution.The distribution of vor-ticity inside the cyclone separator varies at different rotation speeds of the screw pump.As the rotation speed in-creases,the vortices in the relevant flow fields near the overflow pipe and cone section are significantly enhanced.The oil phase volume fraction near the overflow outlet of the cyclone decreases with the increase of the rotation speed of screw pump.The distribution of large oil droplets varies under different rotational states of screw pump.The research results provide reference for the design of the downhole cyclone separation same well injection-produc-tion system and the setting of rotation speed of screw pump.
cyclone separation pipeoil-water separationscrew pumpfluid-solid couplingflow field analy-sisvorticityoil distribution
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