Based on the technologies of traditionally mechanical drilling and water jet, we propose a new method of
abrasive water jet in combination with rock drilling, and establish a combined rock drilling system for the
gas pre-drainage. This study chose the common sandstone and silicon limestone as the rock sample. A
series of experiments were completed in the case of dry drilling, existing technology drilling, combined
drilling with high pressure water jet and combined drilling with abrasive water jet, respectively. The drilling
efficiency and performance were contrasted and analyzed in detail. The results indicate that it is better
to choose the method of combined drilling with the high-pressure water jet for soft rocks. The method
of combined drilling with abrasive water jet is feasible for the hard rock drilling and has higher drilling
efficiency and performance. In this paper, compared with the existing technology, the drilling depth has
increased by about 65%, the axial force and torque have reduced by about 14% and 17%, respectively, and
the drill wear reduces obviously in the same conditions