Movable Formation-Engaging Structures for Earth-Boring Tools
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Solution Overview
Problem
Conventional earth-boring tools with fixed cutting elements face inefficiencies as cutting elements wear down, requiring frequent tool replacement and reduced drilling performance due to the lack of adaptable formation-engaging structures.
Innovation Solution
Incorporating movable formation-engaging structures that shift between shielded and engaged positions during drilling, allowing for extended tool life and improved drilling efficiency by dynamically adjusting their engagement with the formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed cutting elements are used in earth-boring tools, then the structure is simple and reliable, but the tool life is limited and drilling efficiency decreases as cutting elements wear down
Solution Approach 1:
The patent applies the dynamics principle by making the formation-engaging structure movable rather than fixed. The structure can shift between a first position (rotationally behind the cutting element) and a second position (at a different radial distance where it engages the formation). This dynamic capability allows the tool to adapt to changing drilling conditions and extend tool life by optimizing the engagement of formation-engaging structures as cutting elements wear.
2Device complexity
If fixed cutting elements are used in earth-boring tools, then the device complexity is low, but the adaptability to changing drilling conditions is poor
Solution Approach 1:
The formation-engaging structure is designed to be movable between different radial positions, enabling the tool to adapt to varying drilling conditions. This dynamic adjustment capability provides versatility in responding to formation changes, cutting element wear, and drilling parameters without requiring complete tool replacement.
Solution Approach 2:
The earth-boring tool incorporates both cutting elements and movable formation-engaging structures that can perform multiple functions. The formation-engaging structure can operate in different positions to either shield or engage the formation, providing multi-functionality that enhances adaptability across various drilling scenarios.
3Ease of manufacture
If cutting elements are fixed in place, then the manufacturing process is simple, but frequent tool replacement is required reducing productivity
Solution Approach 1:
By implementing a movable formation-engaging structure that can be positioned at different radial distances, the patent extends the productive life of the drilling tool. The structure can be moved to optimal positions as cutting elements wear, eliminating the need for frequent tool replacements and maintaining high productivity throughout the tool's service life.
4Productivity
If formation-engaging structures are always engaged, then drilling efficiency is maximized, but the cutting elements wear down faster requiring frequent replacement
Solution Approach 1:
The movable formation-engaging structure can dynamically adjust its engagement with the formation. It can be positioned to engage the formation when high drilling efficiency is needed, and repositioned to a shielded position when cutting elements require protection or replacement, optimizing both productivity and cutting element longevity.
Solution Approach 2:
The formation-engaging structure can be positioned rotationally behind the cutting element to shield it from direct formation engagement during certain operational phases. This preliminary protective positioning reduces wear on cutting elements, extending their service life while maintaining overall drilling effectiveness.
Data Source
AI summary
Earth-boring tools may have a body, a cutting element attached to the body at a first location, and a formation-engaging structure attached to the body at a second location. The formation-engaging structure may be movable during a drilling operation between a first position and a second position. In the first position, the formation-engaging structure may be located rotationally behind the cutting element at a first radial distance from a longitudinal axis of the body at which the cutting element will at least initially shield the formation-engaging structure from engaging a formation. In the second position, the formation-engaging structure may be located at a different second radial distance from the longitudinal axis of the body at which the formation-engaging structure will engage a formation.