Abstract: Due to the great buring depth and hard Silurian formation with the strong abrasiveness and poor drillability in Yar Canyon Oilfield in Yumen, the PDC or roller bits are vulnerable to wear, resulting in short service time and low perforation rate. By utilizing the Torkbuster together with personalized PDC bit, the stability of both the drill string and torque can be remained, so the bit slippery is overcome effectively and the recoil torsion is lessened, resulting in intensifying WOB and improving ROP. The technoique is applied in drilling Silurian formation of well YS No.1 for 355.05 m, with the average ROP up to 1.70 m/h, 110% higher than that of adjacent wells. It is a new way of speed-up drilling in deep well in Yumen area.