Volume 39 Issue 5
Jan.  2023
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ZHANG Shuncong, DAI Yao, XU Hao, et al.Friction reduction of oleamide lubricants on iron surface[J]. Drilling Fluid & Completion Fluid,2022, 39(5):596-600 doi: 10.12358/j.issn.1001-5620.2022.05.010
Citation: ZHANG Shuncong, DAI Yao, XU Hao, et al.Friction reduction of oleamide lubricants on iron surface[J]. Drilling Fluid & Completion Fluid,2022, 39(5):596-600 doi: 10.12358/j.issn.1001-5620.2022.05.010

Friction reduction of oleamide lubricants on iron surface

doi: 10.12358/j.issn.1001-5620.2022.05.010
  • Received Date: 2022-05-16
  • Rev Recd Date: 2022-06-09
  • Publish Date: 2023-01-10
  • 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 241.7 μm, 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.

     

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