The Tribological Properties of the Hot-extrusion Nylon Coating in the Oil Well Environment

The friction and wear properties of the nylon coating, prepared by hot-extrusion, used to protect the surface of the flexible continuous sucker rod were studied by using a pin-on-disc wear tester in the simulated oil well environment. The effects of sliding speed and load were considered. The wear mechanism was also studied by using a scanning electron microscope ( SEM ). The result shows that the friction coefficients of both kinds of materials, JKPA and ZZ7024B, used to protect the surface of the flexible continuous sucker rod decrease with sliding speed increase , but change little with load increase in the simulated oil well environment . The value of friction coefficient of ZZ7024 B is smaller than that of JKPA. The minimum value of friction coefficient of ZZ7024 B is about 0.05. The wear volume of ZZ7024 B is smaller than that of JKPA under the same conditions of experimentation.