| The pump valve is one of the key part of the fracturing pump hydraulic side when the fracturing pump used in oil and gas of mining operation;In order to improve the efficiency of oil and gas exploration,the fracturing pump is developing to high power and pressure as well as large volume;However,the short service life of the fracturing pump valve makes it difficult for the pump to high power and pressure as well as volume. Pump valve general used only 1-2wells is damaged.The damage to the valve is mainly by the valve working cone wear thorn leakage caused by fracturing fluid ceramsite particles;Pump valve material wear resistance or pump valve sealing surface hardness is not enough,leading that the valve can’t adapt to the fracturing pump working environment.Pump valve sealing surface of the thorn will lead to pump valve closed lax,Pump valve’s leakage occur failure of the fracturing pump parts,It seriously affect the work efficiency of the fracturing pump.According to the above problem,in this paper,the failure forms of fracturing pump valve are analyzed,and identified the main failure mechanism of the pump valve;The result that numerical methods are used to solve the valve disc movement differential equations are the initial conditions of the flow field analysis and impacting dynamics analysis.The study that the abrasive wear is tested,the pump valve flow field simulation and the pump valve impacts dynamics are analysed,as well as the different of pump valve rubber structure fatigue life is researched;Finally the improvement project of the structure of the pump valve is created,and has been carried on the preliminary analysis and research,in order to increase the impact of the pump valve and erosion wear resistance in the process of the above research.The content mainly includes the following several aspects:(1)Through the combination of the field research and theoretical knowledge,the main failure form of pump valve is analyzed;It is concluded that the main failure mechanism of pump valve include impacting abrasive、erosion wear and fatigue wear;(2)The expression and image of displacement、velocity and acceleration of the pump valve are got by solving differential equation of pump valve,It is used that the times and cone angle of the pump valve are studied;(3)In abrasive wear test,the experiment project is designed,the fracturing fluid sand content and the positive pressure on the influence of wear is studied.According to the experiment data,the pump valve wear prediction equation is summarized by the least-square method.(4)In the flow field of pump valve,a simulation model of three dimensional flow field is established,the different lifts、different times and different rubber structure of flow field are analyzed;The pump valve at the same time is carried out the particle surface erosion research,the impact process-the diameter of particle and the impact angle of the pump valve is studied.(5)In the impact fatigue of pump valve,the paper analyzes that the rubber structure is fluenced to the impact of pump valve;Through the tensile test and fatigue test paper,It concludes that the mechanical performance of pump valve and valve S-N curve,thereby the service life of the different rubber structures are predicted.(6)The cone valve plate replaced by spherical contact cone angle and the vibration plate of pump valve structure are presented,the spherical contact and belt vibration plate of the pump valve structure can reduce erosion and impact of pump valve.This paper establishes a set of methods to analyze the wear and failure of pump valve system on the view of main failure type.This method has a certain reference value for the subsequent structure design and parameters optimization of drilling pump valve system. |
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