Abstract
At the beginning stage of the progressing cavity pump (PCP) operation or working in the oil well with high gas content, the stator and rotor of PCP usually operate under dry sliding. Analyzing the wear morphology of stator rubber and discussing wear mechanism are very important for choosing the best stator rubber for different working conditions, which is directly related to the service life of PCP. Wear behavior of NBR/FKM blend rubber (10:0、3:7、7:3、8:2、0:10) was investigated at room temperature using a MPV-600 ring-on-block tester under dry sliding. The wear morphology of blend was analyzed through the stereomicroscope and the wear mechanism was also discussed. The results show that different blend own different wear mechanism. The wear mechanism of NBR/FKM=8:2 blend rubber is fatigue wear, which is better than the others under dry friction.
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