水力喷射工具用35CrMo钢抗冲蚀性能研究  

Study on Erosion-resistance of 35CrMo Steel for Hydraulic Jetting Tools

作　　者：崔璐[1] 李浩[1] 张文[2] 宫娜娜[2] 李景彬[2] 

机构地区：[1]西安石油大学 [2]川庆钻探工程有限公司长庆井下技术作业公司

出　　处：《石油机械》2015年第3期83-87,共5页China Petroleum Machinery

基　　金：国家科技重大专项"超深超高压气井油套管柱安全评价与控制技术研究"(2011ZX05046-03-07);中国石油集团川庆钻探工程有限公司长庆井下技术作业公司项目"油井水平井水力喷射体积压裂工具研究"(CQ2014B-17-1-4)

摘　　要：为了解水力喷射工具用35Cr Mo钢的抗冲蚀性能,模拟实际水力喷射压裂工况,用质量分数0.2%的羟丙基瓜尔胶溶液与石英砂固液混合溶液对35Cr Mo钢试样进行冲刷试验,并借助扫描电子显微镜(SEM)对试验后试样表面形貌进行分析,研究液体入射角和入射流速对冲蚀速率的影响。研究结果表明,上述混合溶液对35Cr Mo钢的冲蚀作用主要表现为机械冲刷磨损;损伤机理为微切削与冲击锻打,小角度入射时以微切削为主,大角度入射时以冲击锻打为主;当冲刷溶液的入射角度为45°时,试样表面冲蚀磨损最严重;入射流体流速的临界值约为8.2 m/s,当流速小于8.2 m/s时,随入射流速的升高,冲蚀速率增加较为平缓,当流速大于8.2 m/s时,冲蚀速率随入射流速升高而迅速上升。因此冲蚀速率与入射流速间的拟合关系应在低流速区和高流速区分段考虑。To determine the erosion-resistance of 35 Cr Mo steel for hydraulic jetting tools,under the simulated conditions of hydraulic jetting and fracturing operations,the solid-fluid mixture of hydroxypropyl guar solution with mass fraction of 0. 2% and quartz sands was used for erosion test of 35 Cr Mo steel samples. Scanning electron microscope（ SEM） was used to analyze surface conditions of samples after test to identify the impacts of liquid incident angle and incident flow rate to erosion rate. The research results show that above mixed solution has mechanical erosion and wearing on 35 Cr Mo steel,in mechanisms behind damages including micro-cutting（ at low incident angles）,and impinge / strike（ during jetting with higher incident angles）. Surfaces of experimental samples are most severely eroded at flushing fluid incident angle of 45°. Critical flow rate of jetting fluid is approximately 8. 2 m / s. If the flow rate is less than 8. 2 m / s,erosion rate may increase gently with increase of incident flow rate. If the flow rate is higher than 8. 2 m / s,erosion rate may increase rapidly with increase of incident flow rate. Accordingly,matching between erosion rates and incident flow rates can be considered in low-rate zone and high-rate zone separately.

关 键 词：水力喷射工具 羟丙基瓜尔胶 35Cr Mo钢 冲蚀速率 入射角 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]