高压管汇三通冲蚀磨损特性研究

Study on Erosion Wear Characteristics of High Pressure Manifold Tee

目的研究在页岩气开采过程中,含砂压裂液对高压管汇三通冲蚀磨损的影响规律及主要影响因素。方法基于两相流颗粒冲蚀理论建立三通冲蚀数值计算模型,预测三通在使用过程中易发生冲蚀磨损的部位,研究三通方位夹角,压裂液入口流量、固相颗粒体积分数、颗粒直径和压裂液密度对三通冲蚀速率的影响。结果 Y型三通和歧型三通冲蚀最严重的部位均在支管与主管的相贯线上。在控制单因素变量的前提下,随着方位夹角从30°增加到150°时,Y型三通的最大冲蚀速率增大了12.7倍。而随着方位夹角从30°增加到90°时,歧型三通的最大冲蚀速率增大了1.85倍,并且最大值出现在60°附近。随着压裂液入口流量从0.5m^(3)/min增加到2.5m^(3)/min,Y型三通的最大冲蚀速率增大了232.5倍;随着压裂液入口流量从1m^(3)/min增加到4 m^(3)/min,歧型三通的最大冲蚀速率增大了7.5倍。同时随着固相颗粒体积分数从2%增加到10%,粒径从200μm增加到600μm,密度从1000 kg/m^(3)增加到1400 kg/m^(3),Y型三通的最大冲蚀速率分别增大了4.4倍、0.63倍、1.3倍,而歧型三通的最大冲蚀速率分别提高了4.4倍、0.58倍、1.06倍。结论两种三通的最大冲蚀速率均随着入口流量、固相颗粒体积分数的增加而变大,随粒径的增加而减小。Y型三通的最大冲蚀速率随空间夹角、压裂液密度的增加而变大,但歧型三通的空间夹角为60°时冲蚀最严重,且压裂液密度对其影响较小。

In the process of shale gas exploitation,the influence of sand-containing fracturing fluid on tee erosion wear of high pressure manifold and its main influencing factors are studied.Based on the two-phase flow particle erosion theory,the numerical calculation model of tee erosion was established to predict the parts prone to erosion wear during the use of the tee,and the effects of tee azimuth angle,fracturing fluid flow,volume fraction,particle diameter,and fracturing fluid density on the erosion rate of the tee were studied.The results show that the most serious erosion of Y-type tee and the disproportionate tee is on the intersection line between branch pipe and main pipe.Under the premise of controlling single factor variable,the maximum erosion rate of the Y-type tee increases by 12.7 times as the azimuth angle increases from 30°to 150°,while the maximum erosion rate of the disproportionate tee increases 1.85 times with the azimuth angle increasing from 30°to 90°,and the maximum value appears near 60°.With the fracturing fluid flow increasing from 0.5 m^(3)/min to 2.5 m^(3)/min and from 1 m^(3)/min to 4 m^(3)/min,the maximum erosion rate of the Y-type tee and the disproportionate tee increased by 232.5 times and 7.5 times,respectively.Meanwhile,as the volume fraction increased from 2%to 10%,the particle size increased from 200μm to 600μm,and the density increased from 1000 kg/m^(3) to 1400 kg/m^(3),the maximum erosion rate of the Y-type tee and the disproportionate tee increased by 4.4 times,0.63 times,1.3 times and 4.4 times,0.58 times and 1.06 times,respectively.The maximum erosion rate of both tees increases with the increase of flow rate and volume fraction,and decreases with the increase of particle diameter.The maximum erosion rate of Y-type tee becomes larger with the increase of spatial angle and fracturing fluid density.However,when the spatial angle of disproportionate tee is 60°,the erosion is the most serious,and the fracturing fluid density has little impact on it.