This effect not only knocks down strength of pumping rod but also rubs through oil tube wall, leading to the oil well unable to work and economic loss of the oil field.

• 偏磨使抽油杆磨损,降低了抽油杆的强度,造成抽油杆断裂,磨穿油管壁,影响油井正常工作,给油田带来较大的经济损失。