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 changes 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 on earth-boring tools, then the tool structure is simple and reliable, but the tool life is limited and requires frequent tool changes 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 transition between a first position (shielded by the cutting element) and a second position (exposed to engage formation), allowing the tool to adapt its configuration during drilling operations to extend tool life while maintaining reliability.
Solution Approach 2:
The patent segments the formation-engaging function into two distinct components: a cutting element and a separate formation-engaging structure. This segmentation allows each component to perform its optimized function independently, with the cutting element for initial cutting and the formation-engaging structure for continued formation engagement, thereby extending overall tool life.
2Duration of action of moving object
If backup cutting elements are fixed to blades, then tool life is extended, but the device complexity increases and drilling efficiency is reduced
Solution Approach 1:
The patent uses a movable formation-engaging structure that can dynamically transition between shielded and exposed positions based on drilling conditions and cutting element wear, rather than having fixed backup cutting elements. This dynamic adjustment optimizes drilling efficiency while extending tool life.
Solution Approach 2:
The formation-engaging structure serves multiple functions: it acts as a backup cutting element when exposed, provides bearing elements when in the shielded position, and can be adjusted based on formation conditions. This multi-functionality eliminates the need for separate fixed backup cutting elements, maintaining drilling efficiency while extending tool life.
3Productivity
If formation-engaging structures are always exposed, then drilling efficiency is improved, but cutting elements wear down faster requiring frequent tool changes
Solution Approach 1:
The patent implements a movable formation-engaging structure that can be positioned in a first location where it is shielded by the cutting element during normal drilling operations. This shielding protects the formation-engaging structure from excessive wear while maintaining drilling efficiency. When cutting elements wear, the structure can move to a second position to engage formation, extending tool life.
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.