The root and pipe eccentric drill bit for down-the-hole water wells is a drilling tool designed for soft and easily collapsed formations, mainly used in water well drilling and foundation reinforcement projects. The eccentric drill bit combined with the root and pipe system can form support during the drilling process, effectively solving the problem of hole wall collapse, and is suitable for drilling needs such as water wells and geothermal wells.
Product features：
1. Eccentric design: The eccentric drill bit produces a slightly larger outer diameter during drilling, forming a slightly larger hole diameter than the root tube, which makes it easier for the root tube to follow the drill bit into the bottom of the hole. This ensures that the root tube can always be close to the hole wall, which helps to maintain the stability of the well wall.
2. Casing system: The root tube (casing) system is a casing system that follows the drilling. The eccentric drill bit expands the hole diameter on the outer diameter of the well wall, so that the root tube is gradually advanced during drilling to support the soft formation and avoid collapse. The root tube is usually made of high-strength steel and has bending and tensile strength.
3. DTH hammer structure: The eccentric drill bit is usually used in combination with the DTH hammer. The DTH hammer provides a strong impact force, which enables the eccentric drill bit to work effectively in both soft formations and hard rocks. The impact force of the DTH hammer is combined with the rotational force to improve drilling efficiency.
4. Detachable design: The eccentric drill bit is usually designed as a detachable structure. After drilling is completed, the eccentric part can be recovered so that the root canal can be left in the well as a supporting structure, saving costs.
