Study On Wear Of Flow Valve With High And Low Pressure Conversion

In the ground device of high- pressure oil and gas well, the needle throttle valve is one of the important wellhead equipments, and its anti- erosion performance is a decisive factor in the impact of its useful life. Scope of application of the valve is more and more widespread, plays a vital role in the industry and life.Typically,however,the working environment of the valve is particularly poor,for example, in the high-pressure oil and gas drilling,having a higher flow velocity of fluid is through the valve because of the flow area becoming smaller suddenly,as a resualt,produces significant corrosion pits or grooves in the working surface of thr valve so that resulting in the loss of the inside surface metal of the valve,can easily cause body piercing or valve structure destruction,ultimately resulting in deformation of the needle valve,and even failure.After analysis,the main cause of the needle valve failure is by particle erosion and destruction. Therefore,in order to solve the problem of erosion wear,the valve established through CFD Fluent in this paper is a the spatial geometry model of erosion wear,and deciding to use the standard k-ε turbulence model SIMPLEC equation and QUICK difference scheme and PRESTO interpolation scheme for needle throttle for liquid-solid two-phase numerical simulation of erosion wear. Available for erosion law: the valve chamber suffered severe erosion than the valve core, and with the gradual increasing of the valve opening, the spool by the erosion of the more serious parts of the valve near the tip, and as the velocity increases, the more serious part of the wear is from the right side of the valve chamber moving to the left of the valve chamber at the entrance to the valve chamber, summarizing the quantitative range of erosion wear caused by different conditions,to provide a theoretical basis for the anti-erosion guidance and needle valve structure optimization.