Drill Bit Shearing Cutter Tracking for Vibration Reduction
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Solution Overview
Problem
Existing drill bits face issues with vibration and wear, leading to reduced stability and increased energy requirements due to the gap between cutting elements, which affects the rate of penetration and longevity of cutting tools.
Innovation Solution
A fixed bladed drill bit design featuring a plurality of blades with pointed cutting elements and shearing cutters, where the shearing cutters track a common circular path and are positioned proximate to the periphery, overlapping with pointed cutting elements to create a more exposed cutting profile, inducing fractures and reducing lateral vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cutting elements are spaced radially across the bit face, then the bit can cut through formation, but gaps between elements cause ridge formation and increased vibration
Solution Approach 1:
The bit face is segmented into multiple blades, each carrying cutting elements. This segmentation allows for a more distributed cutting pattern that reduces the formation of large ridges between elements, thereby improving stability while maintaining productivity.
Solution Approach 2:
Cutting elements are arranged in three-dimensional space with varying radial positions and exposure heights, creating an overlapping cutting pattern. This multi-dimensional arrangement ensures continuous cutting action that eliminates ridge formation and reduces vibration.
2Productivity
If cutting elements are positioned with exposure to formation, then cutting action is effective, but wear increases and longevity decreases
Solution Approach 1:
The bit design incorporates dynamic load distribution across multiple cutting elements arranged in overlapping patterns. This dynamic arrangement ensures that no single element bears excessive load, reducing wear rates and extending element life while maintaining effective cutting action.
Solution Approach 2:
The overlapping arrangement of cutting elements creates a preliminary cutting action where elements work in sequence. This preliminary action distributes the cutting workload and reduces the stress on individual elements, thereby extending their operational life.
3Productivity
If weight on bit is increased to improve penetration, then rate of penetration increases, but energy requirements and vibration increase
Solution Approach 1:
The overlapping cutting element arrangement creates controlled mechanical vibration during cutting. This vibration facilitates rock fracture and reduces the weight on bit required for effective penetration, thereby lowering energy requirements while maintaining high rate of penetration.
Solution Approach 2:
The bit design incorporates curved blade profiles and rounded cutting element geometries that optimize stress distribution during cutting. This curved geometry reduces friction and energy loss, allowing for lower weight on bit and reduced energy consumption while maintaining penetration effectiveness.
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
This design enhances stability, reduces energy requirements, and increases the rate of penetration by minimizing wobbling and extending the life of cutting elements, while also reducing the ideal weight on bit (WOB) and maintaining effectiveness even in hard formations.
Implementation Method 1
shearing cutters... tracking the first shearing cutters on other blades along a common circular cutting path
Implementation Method 2
The pluralities of pointed cutting elements may comprise the characteristic of inducing intermittent fractures in the formation
Data Source
AI summary
In one aspect of the invention, a fixed bladed drill bit comprises a working surface comprising a plurality of blades converging at a center of the working surface and diverging towards a gauge of the bit. Each blade comprises a plurality of pointed cutting elements and another plurality of shearing cutters. The plurality of shearing cutters comprises a first shearing cutter. The first shearing cutter on each blade tracks the first shearing cutter on other blades along a common circular cutting path.