Due to the formation structure of large and medium slope shale gas wells in southern Sichuan, the cuttings produced in drilling process are easily deposited as cuttings beds, which increases the friction resistance of drill pipe and eventually leads to major downhole accidents such as drilling tool fracture.In order to reduce the generation of cuttings bed and improve well cleanliness, a new type of pulse jet tool was put forward.This tool could be used to improve debris settlement, and damage the cuttings beds directly.The simulation software ANSYS was used to establish the simulation models of the new pulse jet tools and the common cuttings carrying drill pipe. CFD-DEM coupling was used to make precise simulation,the cuttings migration capacities within the annulus of the new tool and common drill pipe were contrasted through changing the cuttings diameter, drilling fluid density,entrance displacement and hole inclination angle.It is concluded that compare with the common drill pipe,the new pulse jet has better cuttings migration ability (smaller total cuttings in the annulus after stable quality),and the directional jet not only can destroy the existing cuttings bed, but also can prevent the formation of cuttings bed.The results of the study are of great significance on reducing total quality in borehole annulus and improving economic efficiency of drilling cuttings.