Study On The Characteristics Of Rheological Vibration And Vibration Reduction Measures In The Piping System Of The Re-Injection Pump Room

In oilfield production,the reinjection system is the most critical and common part,and the pipeline vibration often has a large impact on the reinjection system,and the mechanical vibration of the pipeline can lead to a series of safety problems and economic losses,so the study of flow characteristics and structural characteristics of the reinjection pipeline system is of great significance to the safety of the pipeline.Most scholars have focused on the vibration of injection pump house piping system mainly on the vibration of pump body and pump-induced vibration of injection pump,but there is relatively little research on the flow vibration of pipeline.In this paper,through the computational fluid dynamics method,finite element method and field measurement method,we analyze the vibration mechanism and vibration location of the injection system through the flow-solid coupling study of the injection system,combine the field measurement results,propose targeted vibration reduction measures,and finally verify the feasibility of the measures.Firstly,based on the computational fluid dynamics method,this thesis establishes the piping model of the reinjection system,analyzes the hydraulic transient response of the pump room piping system,initially determines that the liquid flow pulse has a large pressure and flow rate on the piping,basically understands the vibration of the piping system,and obtains the hydraulic load spectrum;secondly,based on the finite element numerical simulation method,creates the finite element model of the reinjection piping system,and analyzes the feed pump,injection pump and sink Then,the hydraulic load spectrum obtained from the hydraulic analysis was applied to the finite element model and the vibration response analysis was performed.The simulation analysis included vibration displacement,velocity,acceleration and stress,and the structural response characteristics of the re-injection system under fluid excitation were determined.The vibration spectrum of the pump room was meshed and compared to determine the location of the main occurrence of vibration at the site,and the less rigid areas were modified using support optimization;finally,the vibration response analysis was then performed on the modified finite element model,and vibration measurements were performed on the modified pump room,comparing the numerical analysis data and measurement data before and after the meshing modification,indicating that the vibration reduction measures were effective.The research results show that the overall self-vibration frequency of the re-injection system is low,and is susceptible to strong response from low-frequency excitation;the main vibration cause of the re-injection system is due to the pulsation impact caused by the periodic reciprocating motion of the plunger at the hydraulic end of the injection pump;it is clear that the vibration of the re-injection system mainly occurs at the pipeline gate valve of the re-injection pump pipeline near the vertical filter,followed by the pipeline flow meter of the manifold,and again at the pipeline pipe of the feed pump In order to improve the strength of the pipeline system,we proposed to take support optimization measures for the structure with poor stiffness at the feed pump,injection pump and sink pipe,and carried out fluid-structure coupling analysis through the modified finite element model,and showed that the measures were effective through the measurement of the modified site.