Actuatable Drill Bit Blades for Curved Borehole Steering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current directional drilling techniques face challenges in efficiently drilling curved boreholes due to unpredictable formation conditions and the need for precise steering, often resulting in deviations from planned trajectories.
Innovation Solution
The development of drill bits with individually actuatable blades and a system comprising a first and second bit body connected by a flexible joint, equipped with actuators that modulate the angle between the bit bodies, allowing for controlled actuation to create curved hole geometries and steer the drill bit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional directional drilling techniques are used, then drilling can proceed with standard equipment, but the drill string frequently gets stuck in curved boreholes and deviations from planned trajectories occur
Solution Approach 1:
The drill bit incorporates individually actuatable blades that can dynamically adjust their cut depth and positioning during rotation. The blades are mounted on pivot points and can be selectively actuated to different positions, allowing the drill bit to adapt its geometry in real-time to steer through curved boreholes without getting stuck, thereby improving drilling reliability while maintaining operational ease
Solution Approach 2:
The system changes the operational parameters of the drill bit by selectively actuating specific blades to varying cut depths based on the desired borehole curvature. This dynamic parameter adjustment allows the drill bit to create the necessary sideways forces to follow curved trajectories reliably without compromising the simplicity of the drilling operation
2Manufacturing precision
If standard drill bits with fixed blades are used, then the device structure remains simple, but the ability to drill precise curved boreholes is limited
Solution Approach 1:
The drill bit is segmented into multiple individually controllable blades rather than a fixed solid structure. Each blade can be independently actuated to different cut depths, allowing precise control over the cutting pattern and borehole trajectory. This segmentation enables high manufacturing precision in curved borehole drilling while keeping each individual blade component relatively simple
Solution Approach 2:
The drill bit transitions from a static fixed-blade structure to a dynamic system where blades can be selectively actuated during operation. This dynamic capability allows the system to achieve high trajectory precision by adjusting blade positions in real-time, while the base structure remains relatively simple requiring only actuation mechanisms and pivot points
3Measurement precision
If blades are selectively actuated to create curved hole geometries, then directional drilling accuracy improves, but the actuation system requires additional components and control mechanisms
Solution Approach 1:
Instead of actuating the entire drill bit uniformly, only specific local blades are selectively actuated based on the required directional change. This local quality approach allows precise control over which blades create sideways forces, improving directional drilling accuracy while minimizing the number of actuators and control mechanisms needed compared to a fully actuated system
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
Enables precise directional drilling and efficient creation of curved boreholes by harnessing sideways forces and modulating the angle between bit bodies, reducing the likelihood of the drill string getting stuck and enhancing drilling efficiency and accuracy.
Implementation Method 1
one or more actuators configured to modulate an angle between the axis of rotation of the first bit body and the axis of rotation of the second bit body
Implementation Method 2
a flexible joint connecting the first bit body and the second bit body
Data Source
AI summary
Drill bits and methods of drilling curved boreholes comprising a drill bit including a bit body and one or more cutting blades positioned within the bit body, the one or more blades individually actuatable to a plurality of cut depths. Another aspect of the invention provides a method for drilling a curved borehole. The method includes: providing a drill string including a drill bit including a bit body and one or more blades positioned within the bit body, the one or more blades individually actuatable to a plurality of cut depths; rotating the drill string; and selectively actuating the one or more blades to a plurality of cut depths; thereby drilling a curved borehole.