In June 2015, A customer from Jilin province, produced two drill bits by using FIDC 1308N28 and 1613N28, these two bits were used in Qingxi oilfield in Qinghai province, both PDC bits were working under 4700 meter, one bit footage is 113meter, and the other one had two times of entrance in the well and had a total footage of 272m. ROP is 4.18m/h, the best record is 156 meter in this district and the bit has a new record.