Drill Bit Critical Torque Threshold to Mitigate HFTO
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Solution Overview
Problem
High frequency torsional oscillations (HFTO) occur during drilling operations, leading to equipment failure and inefficiencies, as traditional methods to mitigate HFTO are not always effective.
Innovation Solution
A method and system for designing and selecting a drill bit to mitigate HFTO by determining a critical torque on bit (TOBc) and adjusting drilling parameters or bit design to ensure the generated torque is below the critical threshold, using data from on-bit sensors and stability maps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional drilling methods are used to mitigate HFTO, then drilling operations can proceed with conventional equipment, but HFTO causes equipment failure and reduces drilling efficiency
Solution Approach 1:
The patent applies parameter changes by determining a critical torque threshold and adjusting drilling parameters (weight on bit, rotational speed, torque) to operate below this threshold. This resolves the contradiction by changing the operational parameters to prevent HFTO-induced equipment failure while maintaining drilling efficiency through optimized parameter selection.
2Reliability
If drill bit design is optimized to reduce torque below critical threshold, then HFTO is mitigated and equipment reliability improves, but drilling efficiency may be reduced due to lower torque application
Solution Approach 1:
The patent optimizes drill bit design parameters (cutter configuration, bit geometry, cutter arrangement) to reduce torque below the critical threshold while compensating for potential efficiency loss through enhanced cutter design and configuration that maintains effective rock cutting capability at reduced torque levels.
Solution Approach 2:
The patent employs dynamic adjustment of drilling parameters during operation, allowing real-time modification of weight on bit, rotational speed, and torque to maintain operation below the critical threshold while optimizing drilling efficiency for varying formation conditions.
3Duration of action of stationary object
If critical torque threshold is determined and enforced, then HFTO is prevented and equipment durability improves, but drilling operation flexibility is reduced due to parameter constraints
Solution Approach 1:
The patent implements dynamic parameter adjustment within constrained boundaries defined by the critical torque threshold. Operators can modify drilling parameters in real-time to adapt to different formation conditions while ensuring the torque remains below the critical value, thus extending equipment lifespan without completely sacrificing operational flexibility.
Solution Approach 2:
The patent creates a universal drilling approach that can be applied across different formations and drill bits by establishing a critical torque threshold methodology. This framework provides flexibility in parameter selection while ensuring equipment protection, making the system adaptable to various drilling scenarios within the torque constraint.
Data Source
AI summary
Disclosed herein are embodiments of a method and system for determining a critical torque on bit to reduce the occurrence of high frequency torsional oscillation (HFTO). In one embodiment, a method includes detecting at least one drilling parameter of an offset drill bit for a type of drilling system during an offset drilling operation using at least one in-bit sensor; determining a critical torque on bit (TOB) that is to excite HFTO of the offset drill bit based on the at least one drilling parameter and based on the type of drilling system; measuring, for a current drilling operation, a current TOB and a current weight on bit (WOB) of a current drill bit having a same type of drilling system as the type of drilling system for the offset drilling operation; determining whether current TOB exceeds critical TOB; and mitigating the HFTO for the current drill bit.