The K6-18 well of the No. 1 Oil Production Plant of Henan Oilfield was installed with a CASN metastable special alloy anti-scaling device on January 8, 2016. The pump was inspected on February 16, 2017. The picture below shows the comparison before and after the installation of the anti-scaling device.
Before running into the device, the coupling of the sucker rod is corroded and the sucker rod is scaled by about 2-3 mm.