Study on Vibration Characteristics of Downhole Hydrocyclone Separation String
For purpose of investigating vibration characteristics of the hydrocyclone separation string under twin-screw pump's suction condition,both modal analysis and transient dynamic response analysis were implemented to indicate that,the natural frequencies of the vortex separation column varies at different working conditions;through comparing one end of the fixed injection pump with that of the fixed production pump,the natural frequencies of each stage at the fixed injection pump's one end are smaller;the exciting force and internal flow variation induced by the rotation of the screw pump will cause pipe string deforma-tion,and the deformation caused by the screw pump rotation is larger.As opposed to the fixed injection pump and regarding the fixed production pump,the combined effect of the cyclone separation string's structure and the higher exciting force generated by the injection pump speed can result in hydrocyclone separation string's larger vibration displacement.Controlling time difference between the working states of two screw pumps can ideally control total deformation of the hydrocyclone separation string.
hydrocyclone separation stringscrew pump vibrationdynamic responseunsteady flowsame well injection & production