Abrégé

Disclosed are a multi-cycle flow channel drilling system and drilling process for use in large-scale borehole hard rock drilling. The drilling system comprises a downhole air hammer ground manifold and device, a gas lift manifold and device, a drilling drive apparatus, a multi-cycle flow channel drilling tool and a mud circulating device (6), wherein the downhole air hammer ground manifold and device and the gas lift manifold and device each correspondingly communicate with the multi-cycle flow channel drilling tool by means of the drilling drive apparatus, and the mud circulating device (6) is connected to the drilling drive apparatus by means of an erosion resistant gooseneck (15) and a sand discharging pipeline (14). The present system combines the advantages of both gas lifting reverse circulation sand discharge and a closed reverse circulation air hammer; while ensuring drilling efficiency, the gas injection volume may also be greatly reduced, which is beneficial in reducing device investment, reducing the occupation area of a site, reducing the demand for power and drilling fluid, and saving on fuel consumption.

Classes IPC  ?

• E21B 1/24 - Forage par percussion avec un organe d'impulsion à mouvement alternatif l'organe d'impulsion étant un piston entraîné directement par la pression d'un fluide