Adjustable Depth-of-Cut Drill Bit for Torque Control

The patent applies the dynamics principle by making the depth-of-cut limiting structure movable rather than fixed. The structure can extend axially to limit depth-of-cut when torque exceeds a threshold and retract when torque decreases, allowing dynamic adaptation to varying formation conditions. This dynamic adjustment stabilizes torque-on-bit by preventing excessive depth-of-cut in hard formations while maintaining efficient penetration in softer formations, thereby resolving the contradiction between productivity and reliability.

The patent implements feedback control through the depth-of-cut limiting structure that responds to torque-on-bit conditions. When torque exceeds a predetermined threshold, the structure extends axially to reduce depth-of-cut and lower torque. When torque decreases, the structure retracts to allow greater depth-of-cut. This closed-loop feedback mechanism automatically adjusts depth-of-cut to maintain optimal penetration rate while preventing harmful torque fluctuations, resolving the contradiction between productivity and harmful torque effects.

The patent applies self-service by enabling the drill bit to automatically regulate its own depth-of-cut and torque levels through the movable limiting structure. The bit monitors torque conditions and autonomously adjusts cutting parameters to maintain consistent penetration rates across varying formation hardness. This self-regulating capability eliminates the need for frequent bit changes, as the same bit can adapt to different formation conditions, thereby reducing time loss and drilling costs while maintaining high drilling efficiency.