油酸酰胺型润滑剂在铁表面减摩作用  

Friction reduction of oleamide lubricants on iron surface

作　　者：张顺从 戴尧 徐浩 王继乾[4] 卢福伟 刘桂英 ZHANG Shuncong;DAI Yao;XU Hao;WANG Jiqian;LU Fuwei;LIU Guiying(College of Chemistry and Environmental Engineering,Yangtze University,Jingzhou,Hubei 434023,China;Hubei Engineering Research Centers for Clean Production and Pollution Control of Oil and Gas Fields,Yangtze University,Jingzhou,Hubei;Petroleum Engineering Technology Research Institute,Jiangsu Oilfield,Yangzhou,Jiangsu 225009,China;State Key Laboratory of Heavy Oil Processing,Center for Bioengineering and Biotechnology,China University of Petroleum(East China),Qingdao,Shandong 266580,China;Renqiu chemical branch of Hebei Huabei Petroleum Tiancheng Industrial Group Co.Ltd.,Renqiu,Hebei 062550)

机构地区：[1]长江大学化学与环境工程学院,湖北荆州434023 [2]长江大学油气田清洁生产与污染物控制湖北省工程研究中心,湖北荆州434023 [3]中国石化集团江苏油田分公司石油工程技术研究院,江苏扬州225009 [4]中国石油大学(华东)重质油国家重点实验室,山东青岛266580 [5]河北华北石油天成实业集团有限公司任丘化工分公司,河北任丘062550

出　　处：《钻井液与完井液》2022年第5期596-600,共5页Drilling Fluid & Completion Fluid

基　　金：中石化江苏油田局级项目“重点探区地层压力剖面建立与应用研究”(JS22030)。

摘　　要：采用分子模拟方法研究了油酸酰胺、油酸二乙烯三胺、油酸三乙烯四胺、油酸四乙烯五胺4种表面活性剂在铁表面的吸附性能和润滑性能。吸附模拟结果表明,吸附能随氮原子含量提高而增大,其中油酸四乙烯五胺单分子在铁表面的吸附能为−1512.4679 KJ·mol^(−1),高于其他3种酰胺。剪切动力学模拟结果表明,4种表面活性剂的氮原子集中分布在铁表面,其中含氮较高的油酸四乙烯五胺在剪切面优先吸附,氮原子密度为固定面的1.6倍左右。四球摩擦实验结果表明,氮原子含量提高,酰胺摩擦系数降低,磨斑半径减小,其中油酸四乙烯五胺的摩擦系数为0.00436,是油酸酰胺的1/2,磨斑半径为241.7μm,小于其他3种酰胺。分子模拟和实验结果均表明,随着分子中氮原子含量的增加,油酸酰胺型表面活性剂在铁表面具有更好的润滑效果。The adsorption and lubrication properties of four surfactants on the iron surface based on molecular simulation was investigated.Surfactants include oleamide,oleic acid diethylenetriamine,oleic acid triethylenetetramine,and oleic acid tetraethylenepentamine.Results of adsorption simulation showed that the adsorption energies enlarged with the increase of nitrogen atom content.The adsorption energy of oleic acid tetraethylenetetetramine molecule on the iron surface was−1512.4679 KJ·mol^(−1),which was higher than other three amides.Results of shear dynamics simulation showed that the nitrogen atoms of four surfactants were concentrated on the iron surface.With higher nitrogen content,oleic acid tetraethylenepentamine adsorbed on the shear surface preferentially.On this surface,the nitrogen atom was about 1.6 times the density of the fixed surface.Results of four-ball friction experiment showed that the friction coefficient and the wear scar radius decreased as the nitrogen atom content increased.The friction coefficient of oleic acid tetraethylenepentamine was 0.004,36,which was 1/2 of oleamide.The wear scar radius of oleic acid tetraethylenepentamine was 241.7μm,which was smaller than other three amides.Results of molecule simulation and experimental showed that the oleamide surfactant has better lubrication effect on the iron surface as the atom content of nitrogen in the molecule increase.

关 键 词：油酸酰胺 吸附模拟 剪切动力学模拟 四球摩擦 

分 类 号：TE254.3[石油与天然气工程—油气井工程]