Blowout hole prevention combined damping drilling tool and using method thereof

The invention discloses a blowout hole prevention combined damping drilling tool and using method thereof. The combined damping drilling tool comprises an exposed drill bit, a damping drill rod, a broaching drill bit and a conventional drill rod which are coaxially arranged, the exposed drill bit is arranged at the front end of the damping drill rod, the broaching drill bit is arranged at the rear end of the damping drill rod, and the rear end of the broaching drill bit is connected with the front end of the conventional drill rod. The invention provides a concept of preventing and controlling the blowout hole from the source, the hole bottom damping drilling tool is designed, the basic functions of drilling, reaming and deslagging are achieved, when the gas enrichment area is drilled, airflow power generated by the blowout hole is continuously weakened, and therefore the blowout hole power phenomenon is avoided. 本发明公开了一种防喷孔组合阻尼钻具及其使用方法，包括同轴线设置的揭露钻头、阻尼钻杆、扩孔钻头和常规钻杆，揭露钻头设在阻尼钻杆前端，扩孔钻头设在阻尼钻杆后端，扩孔钻头后端与常规钻杆前端连接。本发明