Shaped Cutter Peripheral Teeth Tapered Open Region
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Solution Overview
Problem
Conventional drill bits face challenges in efficiently removing rock formations due to limitations in cutter geometry and vibration utilization, leading to suboptimal drilling performance in hard formations.
Innovation Solution
The development of shaped cutters with multiple peripheral cutting teeth and a unique geometry that enhances rock failure modes through shearing, indentation, impacting, scraping, and grinding, while utilizing vibrations to increase crack generation and cutting efficiency, featuring a non-planar surface and internal back rake angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional cylindrical cutters with flat cutting tables are used, then manufacturing is simple and reliable, but rock removal efficiency is suboptimal in hard formations
Solution Approach 1:
The cutting table is segmented into multiple peripheral cutting teeth arranged circumferentially, with each tooth acting as an independent cutting element. This segmentation allows the cutter to engage formation at multiple discrete locations simultaneously, increasing rock removal efficiency while maintaining manufacturing simplicity through modular tooth design
Solution Approach 2:
The cutting table transitions from a traditional flat two-dimensional surface to a three-dimensional shaped configuration with peripheral teeth extending radially outward. This dimensional change creates multiple cutting edges at different radial positions, enabling enhanced rock failure modes including shearing, indentation, impacting, scraping, and grinding
2Productivity
If fixed cutter positions are used, then manufacturing is straightforward, but ability to utilize vibrations for enhanced cutting is limited
Solution Approach 1:
The cutter geometry is designed to dynamically interact with vibrations by incorporating peripheral teeth at specific radial positions that can engage and disengage from the formation during rotational motion. The shaped cutting table with its peripheral teeth creates variable engagement characteristics that exploit torsional and axial vibrations to enhance crack generation and cutting efficiency
Solution Approach 2:
The cutter design specifically utilizes mechanical vibrations through its peripheral tooth configuration, where vibrations from the drill string are converted into enhanced cutting action. The shaped cutting table with peripheral teeth at specific radial distances creates vibration-induced stress concentrations that promote crack initiation and propagation in the formation
3Productivity
If traditional flat cutting tables are used, then the structure is simple, but crack generation capability is insufficient
Solution Approach 1:
The cutting table is divided into multiple discrete peripheral cutting teeth, each capable of generating cracks through localized stress application. This segmentation distributes crack generation across multiple teeth, increasing overall crack generation capability while maintaining structural simplicity through repeated tooth geometry
Solution Approach 2:
The peripheral cutting teeth are positioned at the outer periphery of the cutting table, creating a curved or rounded outer boundary rather than a flat surface. This curved configuration allows the teeth to engage the formation at multiple radial positions, enhancing crack generation capability through varied contact points and stress distribution
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 shaped cutters improve rock removal efficiency by generating multiple cracks and distributing energy effectively, enhancing cutting performance in both hard and soft formations by leveraging torsional and axial vibrations.
Implementation Method 1
The shaped cutters may cut rock by shearing
Implementation Method 2
The shaped cutters may cut rock by shearing, and by virtue of its shape, may also enhance other rock failure modes, including but not limited to indentation
Implementation Method 3
The shaped cutters may cut rock by shearing, and by virtue of its shape, may also enhance other rock failure modes, including but not limited to indentation, impacting
Implementation Method 4
The shaped cutters may cut rock by shearing, and by virtue of its shape, may also enhance other rock failure modes, including but not limited to indentation, impacting, scraping and grinding
Implementation Method 5
enhancing cutting performance in both hard and soft formations by leveraging torsional and axial vibrations
Data Source
AI summary
A shaped cutter has a plurality of peripheral cutting teeth to enhance drilling. The shaped cutter may enhance rock failure modes in addition to shearing, such as by indentation, impacting, scraping and grinding. The peripheral cutting teeth are located along the periphery, where cutting energy and forces may be highest. An open region radially inward of the peripheral cutting teeth may be axially recessed to increase the proportion of cutting load on the peripheral cutting teeth. The cutting table may be tapered to modify a back rake angle. The flared periphery may result in a sharper indentation angle and/or larger radius of contact. The plurality of cutting teeth may also exploit vibrations in the drill string to enhance rock failure.