钻井液污染润滑脂对牙轮钻头轴承摩擦学性能的影响  

Effect of Drilling Fluid Contaminated Lubricating Grease on Tribological Properties of Bit Bearings

作　　者：廖文玲 王国荣[2,3] 钟林[2,3] LIAO Wenling;WANG Guorong;ZHONG Lin(College of Mechanical Engineering,Chengdu Technology University,Chengdu Sichuan 611730,China;School of Mechatronic Engineering,Southwest Petroleum University,Chengdu Sichuan 610500,China;Energy Equipment Institute of Southwest Petroleum University,Chengdu Sichuan 610500,China)

机构地区：[1]成都工业学院机械工程学院,四川成都611730 [2]西南石油大学机电工程学院,四川成都610500 [3]西南石油大学能源装备研究院,四川成都610500

出　　处：《润滑与密封》2019年第9期136-141,154,共7页Lubrication Engineering

摘　　要：高温或冲击载荷会引起钻井液泄漏进入复合锂基润滑脂,从而影响牙轮钻头滑动轴承润滑及摩擦磨损性能。采用MCR102旋转流变仪对含有不同质量分数钻井液的复合锂基润滑脂进行流变性测试,并采用MDW-1型摩擦磨损试验机开展牙轮钻头滑动轴承模拟工况下轴承单元摩擦学实验,研究钻井液质量分数对轴承摩擦磨损性能的影响。结果表明:钻井液的污染将降低润滑脂的黏度,改变润滑脂的流变性能;钻井液的污染总体上增大了滑动轴承单元摩擦因数及摩擦因数波动幅度,同时加大轴承的磨损,且在高转速下,润滑脂中较低含量的钻井液就会使滑动轴承单元的摩擦磨损达到最大值;钻井液中的超细碳酸钙和重晶石颗粒引起的磨粒磨损和犁沟效应,可能导致滑动轴承快速失效。High temperature or impact load can cause the leakage of drilling fluid into the composite lithium-based grease,thus affecting the lubrication and friction and wear properties of rock bit journal bearings.The rheological test of the composite lithium-based grease mixed with different mass fraction of drilling fluid was carried out by using MCR102 Rotary Rheometer,and the unit tribology test for journal bearing under the simulated operating condition of rock bits was carried out to analyze the effects of drilling fluid contaminated lubricating grease on the tribological properties of rock bit journal bearings.The results show that the contamination of drilling fluid will reduce the viscosity of grease and change the rheological properties of grease.In general,the contamination of drilling fluid increases the friction coefficient of journal bearing unit and the fluctuation range of friction coefficient,and increases the wear of the bearing.And at high rotational speed,the lower content of drilling fluid in grease will result in the maximum friction and wear of journal bearing unit.Abrasive wear and furrow effect caused by ultrafine calcium carbonate and barite particles in drilling fluid may lead to rapid failure of journal bearings.

关 键 词：牙轮钻头 滑动轴承 钻井液 润滑脂流变性 摩擦磨损 

分 类 号：TH117.1[机械工程—机械设计及理论]