Influence of Liquid Paraffins in Crude Oil on the Friction and Wear Behaviors of the Progressing Cavity Pump`s Stator Rubber

Abstract:

The progressing cavity pump (PCP) always works in the waxy oil well. Therefore the research on the influence of various liquid paraffin contents in crude oil on the friction and wear behaviors of the progressing cavity pump`s stator is very important for choosing the best stator rubber and developing the service life of PCP. Wear behavior of nitrile butadiene rubber (NBR) and fluororubber (FKM) was investigated at room temperature using a reciprocating friction and wear testing machine under the various paraffin contents in crude oil (0%、10%、30%、50%、100%). The wear morphology of blend was analyzed through the stereomicroscope and the wear behavior of two blends was also discussed and compared. The results show that the wear resistance of FKM is better than that of NBR under the same paraffin content in crude oil; With the increase of the paraffin content, the wear and coefficient of friction also increase. When the paraffin content in crude oil is less than 30%, the wear loss of NBR and FKM are basically the same; When the paraffin content in crude oil is more than 30%, the wear loss of NBR is far more than that of FKM.

• Periodical: Applied Mechanics and Materials (Volumes 300-301)
• Pages: 833-836
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.300-301.833
• Online since: February 2013
• Authors: Shi Jie Wang, Hao Lin, Xiao Ren Lv
• Keywords: Coefficient of Friction, NBR/FKM, Paraffin Content, Progressing Cavity Pump (PCP), Rubber Stator, Wear Mechanism

References

[1] Wang Shijie, Li Qin. Electrical submersible motor driven progressive cavity pumping technology and system design [M]. Beijing: Metallurgy Industry Press, (2006).

[2] Tan Qishi. Informal discussion of paraffin in oil [N]. China Oil News, 2004. 6. 1.

[3] Zhang Siwei. Rubber wear principle [M]. Beijing: Petrochemical Industry Press, (1988).

[4] Jia Yichao. Analysis of friction and friction coefficient. Journal of Yuncheng University[J], 2006. 24(2): 60-61.