Abstract: With the deep exploration and development of Bohai oil field, it has been gradually developed from the middle and shallow oil reservoir to the middle and deep oil reservoir. The deep strata in a block of Bohai sea are mainly breccia, breccia and fine sandstone. This kind of formation is compact, hard, high compressive strength, strong abrasion, and poor drillability. In order to increase the mechanical drilling speed, shorten the drilling cycle and save the drilling cost. For the first time, HPG composite impactor speed up tool was used in a well in Bohai Sea, which improved the mechanical drilling speed of the applied well section, shortened the drilling cycle, and achieved remarkable results. The practice shows that the speed-raising tool has a good prospect for application.