Retractable Pads for Adjustable Drill Bit Aggressiveness
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Solution Overview
Problem
The existing earth-boring tools require frequent bit changes to optimize rate-of-penetration (ROP) during horizontal well drilling, which is time-consuming and costly due to the need for different drill bits with varying aggressiveness.
Innovation Solution
The earth-boring tool incorporates retractable pads coupled to pistons within cavities, regulated by a valve and incompressible fluid, allowing for adjustable aggressiveness by extending or retracting the pads during drilling, facilitating the transition between curved and horizontal borehole segments without the need for multiple bits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional drill bits with fixed aggressiveness are used, then the rate-of-penetration can be optimized for specific drilling conditions, but frequent bit changes are required when transitioning between curved and horizontal borehole segments, increasing time and cost
Solution Approach 1:
The drill bit incorporates retractable pads that can be dynamically extended or retracted during drilling operations. This dynamic adjustment allows the bit aggressiveness to be changed without removing the bit, enabling transition between curved and horizontal borehole segments while maintaining optimized rate-of-penetration for each drilling phase
Solution Approach 2:
The invention changes the physical state and position of the pads (retracted vs. extended) to alter the aggressiveness parameter of the drill bit. By controlling pad position through hydraulic or mechanical systems, the bit can adapt to different drilling conditions without physical replacement
2Productivity
If multiple drill bits with different aggressiveness are used to optimize drilling performance, then the rate-of-penetration can be maximized for different borehole segments, but the device complexity and operational cost increase due to requiring multiple bits and frequent changes
Solution Approach 1:
A single drill bit is designed to perform multiple functions by incorporating retractable pads that can be adjusted between retracted and extended positions. This multi-functionality eliminates the need for multiple specialized bits, reducing device complexity while maintaining optimized drilling performance across different borehole segments
Solution Approach 2:
The drill bit transitions from a static, fixed-aggressiveness design to a dynamic, adjustable-aggressiveness design through movable pads. This dynamic capability allows one bit to replace multiple bits with different fixed characteristics, simplifying the overall drilling 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
This solution enhances drilling efficiency by optimizing ROP and reducing operational costs by allowing for adjustable aggressiveness of the drill bit without the need for frequent bit changes, enabling efficient formation of both curved and horizontal borehole segments.
Implementation Method 1
a retractable pad positioned in the at least one cavity adjacent the face and coupled to a piston located at least partially within the at least one cavity. Additionally, a substantially incompressible fluid may be in contact with the piston and contained within a first reservoir
Implementation Method 2
a valve positioned within the earth-boring tool and configured to regulate flow through an opening of the first reservoir
Data Source
AI summary
An earth-boring tool may comprise at least one cavity formed in a face thereof. At least one retractable pad residing in the at least one cavity may be coupled to a piston located at least partially within the at least one cavity. Additionally, a valve may be positioned within the earth-boring tool and configured to regulate flow of an incompressible fluid in contact with the piston through an opening of a reservoir. A cartridge may comprise a barrel wall defining a first bore, and a piston comprising at least one retractable pad positioned at least partially within the first bore. The barrel wall and the piston may define a first reservoir within the first bore, and a valve may be positioned and configured to regulate flow through an opening to the first reservoir. Related methods and devices are also disclosed.