One-Way Coupling Tool for Downhole Torsional Oscillation Mitigation
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Solution Overview
Problem
High frequency torsional oscillations in downhole assemblies during drilling for geothermal energy or oil and gas can cause significant damage to components such as rotary steerable tools and PDC drill bits, and existing solutions are inadequate due to the complexity of modeling and varying drilling conditions.
Innovation Solution
A high frequency torsional oscillation mitigation tool with a one-way coupling that transmits torque in one direction while preventing it in the opposite direction, utilizing multiple sets of driving elements to reduce kinetic energy transfer and alter resonant system boundaries, optionally with a locking mechanism for extreme conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a one-way coupling is used to mitigate high frequency torsional oscillations, then damage to downhole assemblies is reduced, but torque transmission efficiency is compromised
Solution Approach 1:
The one-way coupling mechanism dynamically adapts its torque transmission characteristics based on rotational direction. During normal drilling operations, it transmits torque efficiently in the forward direction, but automatically disengages to allow free rotation in the reverse direction during high frequency torsional oscillations, thus protecting downhole assemblies from damage while maintaining operational efficiency
Solution Approach 2:
The one-way coupling acts as an intermediary element between the drill string and downhole assemblies. It selectively transmits or blocks torque based on rotational direction, serving as a protective mediator that allows beneficial torque transmission while blocking harmful reverse torque during oscillations
2Reliability
If multiple sets of driving elements are used to reduce kinetic energy transfer, then oscillation mitigation is improved, but device complexity increases
Solution Approach 1:
The driving elements are segmented into multiple sets distributed along the longitudinal axis of the tool. Each set independently contributes to torque transmission and oscillation mitigation, allowing the system to reduce kinetic energy transfer through distributed mass elements while maintaining a modular and manageable structural configuration
3Reliability
If a locking mechanism is added for extreme conditions, then reliability under extreme loads is improved, but ease of operation deteriorates
Solution Approach 1:
The locking mechanism is pre-configured and automatically engages when extreme conditions are detected, such as when the drill string becomes stuck or excessive reverse torque is applied. This preliminary preparation allows the system to survive extreme loads without requiring complex real-time control decisions during critical moments
Solution Approach 2:
The locking mechanism operates autonomously based on mechanical conditions, automatically locking when reverse torque exceeds a threshold and releasing when conditions normalize. This self-service operation protects the system during extreme conditions without requiring external intervention or complex control systems
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 tool effectively mitigates high frequency torsional oscillations, reducing the risk of damage to downhole assemblies by preventing energy buildup and resonance, while maintaining efficient torque transmission during normal operations.
Implementation Method 1
a one-way coupling between the first end and the second end, the one-way coupling having a first part and a second part, the first part being connected to rotate with the first connector and the second part being connected to rotate with the second connector, the one-way coupling having an engaged condition in which the first part and the second part can rotate together in a first rotational direction and a disengaged condition in which the first part can rotate relative to the second part in a second rotational direction
Data Source
AI summary
A high frequency torsional oscillation mitigation tool for use in a downhole drilling assembly. The tool has a first end, a second end, and a one-way coupling therebetween. The one-way coupling has a first part connected to rotate with the first end and a second part connected to rotate with the second end. The one-way coupling has an engaged condition in which the first part and the second part can rotate together in a first rotational direction whereby drill string rotation can be communicated to the drill bit. The one-way coupling has a disengaged condition in which the first part can rotate relative to the second part in a second rotational direction. The one-way coupling can have multiple sets of driving elements along its longitudinal axis. The tool can include a locking mechanism to override the one-way coupling for recovering a stuck downhole assembly.