Lubrication performance of nano molybdenum disulfide as additive in drilling fluid in polycrystalline diamond compacts

Abstract The effects of nano-molybdenum disulfide (nano-MoS2) in drilling fluid and drilling fluid on the tribological behavior of polycrystalline diamond compact (PDC) with cobalt leaching depth of 422µm were studied by ball-on-disk friction test, and the effects of concentration and bearing capacity were evaluated respectively. The results showed that the addition of nano-MoS2 improves the lubrication effect of drilling fluid and the friction performance of PDC. The lubrication mechanism of drilling fluid and the mechanism of adding nano-MoS2 to improve tribological properties are discussed. The results further deepen the understanding of the friction and wear mechanism of PDC in lubricating environment, and provide a theoretical reference for the application of PDC in the future petroleum field.