In-Cone Depth of Cut Controllers for PDC Bit Vibration Mitigation
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Solution Overview
Problem
Drill bits and bottom hole assemblies experience axial, lateral, and torsional vibrations during drilling, leading to mechanical failure and inefficiencies due to coupled high-frequency vibrations, which existing technologies have not adequately addressed.
Innovation Solution
The implementation of depth of cut controllers (DOCCs) on polycrystalline diamond compact (PDC) drill bits to mitigate coupled vibrations by optimizing drill bit design parameters such as depth of cut, weight on bit, and torque on bit, using data from drilling runs and vibrational measurements to correlate design features with drilling efficiency and vibration patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If depth of cut controllers are added to PDC drill bits, then coupled vibrations are mitigated and drilling efficiency is enhanced, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the depth of cut controller geometry parameters (contact area, position, shape) to optimize vibration mitigation. Different DOCC configurations with varying contact areas and positions are designed to control the interaction between the drill bit and formation, thereby reducing coupled vibrations while maintaining manageable complexity through systematic parameter optimization rather than radical design changes
2Reliability
If depth of cut controllers with larger contact area are used, then vibration mitigation is improved, but weight on bit increases
Solution Approach 1:
The patent applies local quality by positioning depth of cut controllers at specific locations on the drill bit where they contact the formation. The DOCCs are strategically placed to interact with the formation at critical points to mitigate vibrations, rather than uniformly distributing contact across the entire bit. This localized interaction allows vibration control with minimized additional weight on bit
3Productivity
If multiple design parameters are optimized for vibration mitigation, then drilling performance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies partial action by focusing optimization on the most critical design parameters (such as DOCC contact area and position) rather than attempting to perfectly optimize all parameters simultaneously. This approach achieves significant vibration mitigation and drilling efficiency improvements by concentrating efforts on key parameters, thereby reducing the overall manufacturing precision burden while still delivering substantial performance benefits
Data Source
AI summary
Design parameters for PDC drill bit including in-cone depth of cut controllers (DOCCs) are correlated to instances of coupled vibrations in the axial, lateral, and torsional directions occurring during downhole drilling. Design parameters are quantified by drilling efficiency (DE), average in-cone DOCC contact area, average weight on bit (WOB) taken off by in-cone DOCC, and average torque on bit (TOB) taken off by in-cone DOCC. Design guidelines to mitigate coupled vibrations are generated by correlating design parameter quantifiers and instances of coupled vibrations. Potential drill bit designs are then validated against the generated guidelines in order to mitigate vibration in future drilling runs.