Zhou Ziyi, Zhou Qin, Qin Kun, Li Shuaishuai, Zhang Kai, Yuan Tongxin, Sun Weihao
School of Engineering and Technology, China University of Geosciences (Beijing), 29 Xueyuan Road, Haidian, Beijing 100083, China.
Key Laboratory on Deep Geo-Drilling Technology of the Ministry of Land and Resources, China University of Geosciences (Beijing), 29 Xueyuan Road, Haidian, Beijing 100083, China.
Polymers (Basel). 2023 Apr 12;15(8):1857. doi: 10.3390/polym15081857.
Pressure has a significant effect on rubber seal performance in the abrasive environments of drilling. The micro-clastic rocks intruding into the seal interface are prone to fracture, which will change the wear process and mechanism, but this process is not yet known at present. To explore this issue, abrasive wear tests were carried out to compare the failure characteristics of the particles and the variation wear process under high/low pressures. The results show that non-round particles are prone to fracture under different pressures, resulting in different damage patterns and wear loss on the rubber surface. A single particle force model was established at the soft rubber-hard metal interface. Three typical breakage types of particles were analyzed, including ground, partially fractured, and crushed. At high load, more particles were crushed, while at low load, shear failure was more likely to occur at the edges of particles. These different particle fracture characteristics not only change the particle size, but also the state of motion and thus the subsequent friction and wear processes. Therefore, the tribological behavior and wear mechanism of abrasive wear are different at high pressure and low pressure. Higher pressure reduces the invasion of the abrasive particles, but also intensifies the tearing and wear of the rubber. However, no significant differences in damage were found for steel counterpart throughout the wear process under high/low load tests. These results are critical to understanding the abrasive wear of rubber seals in drilling engineering.
在钻井的磨蚀环境中，压力对橡胶密封性能有显著影响。侵入密封界面的微碎屑岩容易断裂，这将改变磨损过程和机制，但目前这一过程尚不清楚。为了探究这个问题，进行了磨料磨损试验，以比较高/低压力下颗粒的失效特性和磨损过程的变化。结果表明，非圆形颗粒在不同压力下容易断裂，导致橡胶表面出现不同的损伤模式和磨损损失。在软橡胶-硬金属界面建立了单颗粒受力模型。分析了颗粒的三种典型破碎类型，包括磨碎、部分破碎和粉碎。在高载荷下，更多颗粒被粉碎，而在低载荷下，颗粒边缘更容易发生剪切破坏。这些不同的颗粒断裂特性不仅改变了颗粒尺寸，还改变了运动状态，进而影响了后续的摩擦和磨损过程。因此，磨料磨损在高压和低压下的摩擦学行为和磨损机制是不同的。较高的压力减少了磨料颗粒的侵入，但也加剧了橡胶的撕裂和磨损。然而，在高/低载荷试验的整个磨损过程中，钢配对件的损伤没有发现显著差异。这些结果对于理解钻井工程中橡胶密封件的磨料磨损至关重要。
