Recently, the Second Ermen Oilfield in Henan Oilfield metering station plug metering station for technological success. In the past, the oil metering station polymer plunger plunger all the metal material, due to the injection of polymer-linked polymer corrosive, easy to cause the plunger seal lax, serious leakage affect the injection effect. Therefore, the plunger must be replaced once a week worth 470 yuan, which will not only affect the production and cause a great waste. The oil mine technicians through trial and error, the success of ceramic materials. At present, the plunger needs to be replaced only once for 100 days. Three pumps are started daily for normal production, saving more than 800,000 yuan annually.