Wire Woven Elastic Member for Drill Bit Force Modulation
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Solution Overview
Problem
Conventional drill bits with fixed cutters suffer from uneven wear and premature failure due to unidirectional force modulation, which cannot effectively handle multi-dimensional forces encountered during drilling, especially at rock formation junctions, and existing elastic members lack durability in downhole conditions.
Innovation Solution
A force modulation system utilizing a wire woven elastic member that provides variable force in multiple directions, comprising a braided and compression molded spring wire with a corrosion-resistant coating, allowing the drill bit to maintain position in more than one dimension and withstand extreme downhole conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed cutter is used on the drill bit, then the cutter reliability under extreme heat and pressure conditions is improved, but the cutter wear becomes substantial and uneven
Solution Approach 1:
The patent applies dynamics by making the previously fixed cutter position adjustable. The holder can move along the blade in the direction of the cutting force vector, allowing the cutter to dynamically adjust its position during drilling operations. This dynamic adjustment enables the cutter to optimize its cutting angle and depth, distributing wear more evenly across multiple cutters and extending service life while maintaining reliability under extreme conditions.
2Speed
If the fixed cutters are placed on the bit blade, then the cutting velocity is maximized, but the cutter wear becomes more severe due to highest linear cutting velocity
Solution Approach 1:
The holder's ability to move along the blade allows cutters on the bit blade to dynamically adjust their position in response to cutting forces. This dynamic adjustment optimizes the cutting velocity distribution and reduces excessive wear on individual cutters, thereby extending their durability while maintaining high cutting velocities necessary for efficient drilling.
Solution Approach 2:
The patent changes the parameter of cutter position from fixed to variable. By allowing the holder to move along the blade, the cutting depth and angle parameters can be dynamically adjusted, optimizing the balance between cutting velocity and cutter wear, thus improving both speed and reliability.
3Force
If a unidirectional elastic member is used for force modulation, then the cutting force is reduced in one direction, but the system cannot handle multi-dimensional forces encountered during drilling
Solution Approach 1:
The patent transitions from unidirectional to multi-dimensional force modulation by allowing the holder to move not only in the direction of the elastic member but also along the blade. This adds another dimension to the force modulation capability, enabling the system to handle multi-dimensional forces encountered during drilling, particularly at rock formation junctions, while maintaining reduced cutting forces.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system extends the drill bit's working life by preventing damage from excessive forces in multiple directions, ensuring a more reliable and durable cutting profile, even under high temperatures and pressures.
Implementation Method 1
a first force member positioned against the holder so as to exert a first force in a second direction of the holder... the first force member is comprised of a first woven material
Data Source
AI summary
The force modulation system for a drill bit includes a cutter, a holder, a holder retention device, and a first force member made of a first woven material. The cutter fits in the holder, and the holder fits in the drill bit. The holder retention device exerts a holder retention force in a first direction. The first force member exerts a first force in a second direction. The second direction is angled offset to the first direction so as that a cutting profile of the force modulation system is variable. There can also be a second force member of a second woven material to exert a second force in the first direction for more variability of the cutting profile in the first direction. The second force member can be made integral with the first force member, including the first woven material and the second woven material being the same material.