钻杆转速对铝合金隔水管摩擦学性能的影响

Effect of Drill Pipe Rotation Speed on Tribological Behavior of Aluminium Alloy Riser

以G105钻杆材料和7075铝合金隔水管材料为对摩副,通过销盘摩擦实验研究了钻杆转速对7075铝合金隔水管摩擦学性能的影响。研究结果表明:随着钻杆转速的增大,7075铝合金隔水管的磨损率先减小后增大,平均摩擦系数逐渐减小。在低钻杆转速下(50 r/min),由于大量磨粒滞留在摩擦面,主要磨损机理是磨粒磨损;在中等转速下(100 r/min),由于接触面温度升高,隔水管表面形成一层致密的摩擦层,有效地保护了铝合金隔水管基体,此时磨损机理作为氧化磨损;在高钻杆转速下,摩擦接触面温度急剧升高,此时主要磨损机理转变为粘着分层磨损。研究成果可以为钻井工程师安全使用7075铝合金隔水管提供一定的参考。

The tribological properties of 7075 aluminum alloy riseragainst G105drill pipe were studied by pin-ondisc wear tests.Results showed that with the increase of drill pipe speed,the wear rate of 7075 aluminum alloy riser decreases first and then increases,and the average friction coefficient decreases gradually.At a low drill pipe speed(50 r/min),since a large number of abrasive particles were stuck on the friction surface,the main wear mechanism was abrasive wear;At medium speed(100 r/min),a compacted friction layer formed on the surface of the riser due to the temperature rise,which effectively protected the matrix of the aluminum alloy riser.At this time,the wear mechanism is oxidation wear;Under high drill pipe speed,the surface temperature rises sharply and the main wear mechanism changes into adhesive delamination wear.The research results can provide references for drilling engineers to safely use 7075 aluminum alloy riser.