40Cr在高压液固两相流中的冲蚀行为  

Erosion Behavior of 40Cr in High Pressure Liquid-Solid Two Phase Flow

作　　者：王国荣[1] 熊柯睿 黄亮 楚飞 钱权[1] 

机构地区：[1]西南石油大学机电工程学院,四川成都610500 [2]中石油西南油气田公司蜀南气矿,四川泸州646000 [3]中国石油集团钻井工程技术研究院北京石油机械厂,北京100083

出　　处：《润滑与密封》2018年第2期1-5,11,共6页Lubrication Engineering

基　　金：国家重大科技专项(2011ZX0548-04HZ)

摘　　要：为研究钻井液中的固相颗粒对控压钻井节流阀阀芯表面轮廓冲蚀的影响,采用高压水携砂喷射法模拟节流阀阀芯工作环境,探究节流阀阀芯材料40Cr在不同攻角下的冲蚀行为,分析冲蚀量与攻角的关系;采用三维扫描仪测量冲蚀后材料的表面形貌,采用扫描电镜(SEM)观测材料冲蚀区的微观形貌,分析不同攻角下材料的冲蚀磨损机制。结果显示:当攻角由15°增加到90°时,试件冲蚀斑坑深度、冲蚀质量损失呈现先增加再减小的趋势,并在45°时达到最大,同时,冲蚀斑坑形状由椭圆形状逐渐向圆形变化;随着冲蚀时间的延长,在攻角为45°时冲蚀质量损失以指数方式增加;40Cr材料在低角度冲蚀为"犁削"作用,高角度为"冲击锻打",在整个冲蚀过程中2种损伤机制并存,在45°时2种作用效果最大。研究表明:通过改变阀芯轮廓使粒子攻角避开45°附近,可减少节流阀冲蚀磨损。In order to study the erosion behavior of the solid particles in the drilling fluid on the valve surface of the managed pressure ＆filing throttle valve,the water jet method was conducted to simulate the working condition of throttle valve,and the erosion performances of 40Cr were explored under different impact angles.The relationship between erosion mass loss of 40Cr and impact angles were studied and the erosion shape of specimen was captured by 3D scanner under different impact angles.The erosion area of the specimen was observed by SEM to analyze the mechanism of erosion of the specimen under different impact angles.Experimental results show as impact angle increases from 15°to 90°, the depth of e- rosion pits and the erosion mass loss are increased first and then decreased, which achieve the maximum at 45~. Mean- while, the erosion pits of specimens change from ellipse to circle gradually.With the increase of time, the erosion mass loss is increased in an exponential manner at 90°.The main erosion mechanisms are ＂plough-effect＂ at a low impact angle and ＂impact＂ at a high impact angle, however, the interaction of the two mechanisms reach the maximum at the impact angle of 45°.The result illustrates that,by changing the spool profiles to avoid the particle impact angle of 45° ,the erosion wear of the throttle valve can be reduced.

关 键 词：控压钻井 节流阀 40Cr 冲蚀 

分 类 号：TB37[一般工业技术—材料科学与工程] TH117.1[机械工程—机械设计及理论]