To improve the service life of the newly designed pneumatic downhole motor, a kind of commercially crystal beaded candle holder available lithium complex grease was used to help avoid the rapid wear-induced failure of the dynamic seal of pneumatic downhole tools in operation.The investigation on the tribological behaviors of QBe2 beryllium bronze and 38CrMoAlA steel tribo-pairs in pneumatic downhole motor revealed that under lubrication, the instantaneous friction coefficient and wear volume became very low, showing greatly reduced friction and excellent anti-wear performance.Compared with the case without lubrication, the adhesive wear mechanism and ploughing effect of the tribo-pairs were significantly alleviated.Moreover, Cu and Fe were oxidized to form composite oxides between the frictional surface, further metabo 15-gauge finish nailer cordless improving the lubrication effect between the QBe2 beryllium bronze and 38CrMoAlA steel.
Notably, the test could be operated stably for more than 150 h under lubrication, fully reaching the requirement of pneumatic downhole tools under actual drilling conditions.These results provide a solid support for the practical application of the reported pneumatic downhole tools.