Combined drilling tool

• Main Authors: LIU WANCHENG, LIU XIANFU, HE WEI, LI WENFU, MA XIAOHUI, WANG XIANGYANG, WANG YAN
• Format: Patent
• Language: Chinese; English
• Published: 25.06.2024
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The utility model discloses a combined drilling tool. Relates to the technical field of soft coal seam drilling. And the rear drill bit is connected with the front drill bit, second arrangement teeth are arranged at the end, close to the front drill bit, of the rear drill bit, third arrangement teeth are arranged at the bottom of the rear drill bit, and the fracturing device is connected through the rear drill bit. The front drill bit is arranged to sweep a drill hole and broach a local hole diameter reducing section, and it is guaranteed that a fracturing device is fed in smoothly; a rear drill bit is arranged to perform reverse drilling during rotary drilling retreating and is used for dredging a hole collapse section generated during fracturing, and the fracturing device, the connecting rod and the hole sealing fly stopper are smoothly recycled. 本实用新型公开了一种组合钻具。涉及松软煤层钻进技术领域，包括：前置钻头，前置钻头的底部设置第一排布齿；后置钻头，后置钻头与前置钻头连接，后置钻头靠近前置钻头的一端设置第二排布齿，后置钻头的底部设置第三排布齿，通过后置钻头连接致裂器。本实用新型通过设置前置钻头对钻孔扫孔，局部孔径变小段扩孔，确保致裂器顺利送入；通过设置后置钻头