Vibration-Based Drilling System Steering
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Solution Overview
Problem
Existing directional drilling systems require large forces and complex control systems to steer the drill bit, which can lead to inefficiencies and increased costs due to the need for large downhole motors and synchronization of thrusts against the borehole wall.
Innovation Solution
The system utilizes dynamic interactions between the drilling system and the borehole wall, including asymmetric contact elements and non-uniform compliance, to control the drill bit's direction without applying large forces, using sensors and processors to manage these interactions for real-time steering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If large forces are applied to steer the drill bit using conventional directional drilling systems, then directional control is achieved, but power consumption and system complexity increase
Solution Approach 1:
The patent utilizes controlled vibrations and oscillations of the drill string to achieve directional steering. By inducing specific vibrational modes in the drill string, the system can interact with the borehole wall to generate steering forces without requiring large continuous forces from downhole motors, thereby reducing power consumption while maintaining directional control precision
Solution Approach 2:
The patent replaces the conventional mechanical push-the-bit or point-the-bit systems with a vibration-based steering mechanism. Instead of using large forces applied through mechanical contact with the borehole wall, the system uses controlled vibrations to achieve steering, substituting a high-power mechanical system with a lower-power vibrational system
2Measurement precision
If large forces are applied to steer the drill bit, then directional control is achieved, but system complexity increases due to large downhole motors and thrust synchronization
Solution Approach 1:
The patent replaces complex mechanical steering systems with vibration-based control. Instead of requiring large downhole motors and sophisticated thrust synchronization mechanisms, the system uses controlled vibrations that can be generated by simpler means, thereby reducing overall system complexity while maintaining directional control capability
Solution Approach 2:
The drill string's own vibrational characteristics are utilized for steering purposes. By exciting natural vibrational modes of the drill string itself, the system leverages the inherent mechanical properties of the drilling equipment to achieve steering, eliminating the need for additional complex steering mechanisms and reducing system complexity
3Ease of operation
If conventional directional drilling systems are used, then the drill bit can be steered, but inefficiencies and increased costs result from large forces and complex control requirements
Solution Approach 1:
By using vibration-based steering, the system improves operational efficiency through reduced power consumption and simplified control requirements. The vibrational approach allows for more efficient energy utilization compared to conventional large-force systems, thereby reducing operational costs while maintaining directional drilling capability
Data Source
AI summary
This disclosure relates in general to a method and system for controlling a drilling system for drilling a borehole in an earth formation. More specifically, but not by way of limitation, embodiments of the present invention provide systems and methods for controlling dynamic interactions between the drilling system for drilling the borehole and an inner surface of the borehole being drilled to steer the drilling system to directionally drill the borehole. In another embodiment of the present invention, data regarding the functioning of the drilling system as it drills the borehole may be sensed and interactions between the drilling system for drilling the borehole and an inner surface of the borehole may be controlled in response to the sensed data to control the drilling system as the borehole is being drilled.