The eccentric drill bit provides a stable - drilling, high - well - diameter - quality, safe, and efficient bottom - hole reaming solution for formations prone to diameter reduction, difficult - to - drill formations, and special working conditions.

This type of drill bit is characterized by optimized pilot - hole and reaming tooth - layout structures, optimized reaming grading, minimizing the eccentric movement of the drill bit at the bottom of the well, enabling stable cutting, and extending the drill bit's service life. Composite cutters are carefully selected according to the functional requirements of different parts of the eccentric drill bit to prevent early failure of the composite cutters. The cutting structure is optimized with personalized design to achieve a good match between the pilot - hole and reaming, thus realizing the goal of fast drilling. A professional fluid analysis system is used to optimize the flow - field distribution between the pilot - hole and reaming, preventing overheating of the pilot - hole composite cutters.