Dual-Cutter Drill Bit Element Wear Life Extension
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Solution Overview
Problem
Rotary drag type drill bits experience reduced effectiveness due to wear of cutting elements, leading to frequent replacements and associated delays and costs, as existing cutting elements do not effectively extend the working life of the drill bit.
Innovation Solution
A cutting element design featuring a primary cutter with a recessed secondary cutter, where the secondary cutter is initially enclosed or partially exposed, allowing it to become engaged as the primary cutter wears, thereby sharing the drilling load and extending the drill bit's operational life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a single cutting element is used on a drill bit, then the structure is simple and easy to manufacture, but the working life is limited due to wear
Solution Approach 1:
The cutting element is divided into two distinct cutting tables: a first cutting table and a second cutting table, each capable of performing the cutting function. This segmentation allows the cutting element to have extended working life as the second table can take over when the first table wears, while maintaining a relatively simple overall structure that is still manufacturable using conventional techniques
Solution Approach 2:
The second cutting table is positioned within a recess in the substrate, effectively nesting it within the overall cutting element structure. This allows the dual-table design to be accommodated without significantly increasing the external dimensions or complexity of the cutting element, as one table is embedded within the substrate rather than adding external complexity
2Volume of stationary object
If the second cutting table is initially enclosed within the substrate, then the structure is compact, but the second table cannot contribute to drilling until the first table wears
Solution Approach 1:
The second cutting table is pre-positioned within the recess in the substrate during manufacturing, ready to engage the formation. This preliminary positioning ensures that when the first cutting table wears, the second table is already in place and can immediately contribute to drilling without requiring any adjustment or replacement operations, thereby maintaining productivity
Solution Approach 2:
The cutting element is designed to dynamically transition from using only the first cutting table to using both tables as wear progresses. The second table's engagement is not fixed but evolves based on the wear condition of the first table, allowing the system to adapt its cutting configuration to maintain optimal drilling efficiency throughout its service life
3Duration of action of moving object
If a dual-cutter design is implemented, then the working life is extended, but the manufacturing process becomes more complex
Solution Approach 1:
The cutting element is divided into two distinct cutting tables that can be manufactured separately using conventional sintering techniques. This segmentation allows each table to be produced using standard manufacturing processes, and then assembled by bonding to the substrate, maintaining ease of manufacture while achieving extended working life through the dual-table configuration
Solution Approach 2:
The second cutting table is nested within a recess in the substrate, which simplifies the assembly process. The recess provides a pre-formed housing for the second table, eliminating the need for complex external mounting structures and allowing both tables to be integrated into a single compact component that can be manufactured using conventional techniques
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
The dual-cutter design significantly increases the working life of the cutting element and drill bit by distributing the drilling load, potentially extending the lifespan by 140% or more without increasing the number or size of cutting elements.
Implementation Method 1
the cutting elements bear against the adjacent formation, scraping, gouging, abrading, cutting or otherwise removing the formation material
Implementation Method 2
the cutting elements affixed to a drill bit will become worn, reducing the effectiveness of the drill bit
Implementation Method 3
The cutters are typically sintered under high temperature, high pressure conditions. After sintering, further procedures may be undertaken to remove a binder or catalysing material from parts thereof
Data Source
AI summary
A cutting element comprises a primary cutter including a first table of a hard material bonded to a first substrate of less hard form, the first substrate of the primary cutter having a recess formed therein in which a secondary cutter is located, the secondary cutter comprising a second table of a hard material bonded to a second substrate of less hard material, the first and second tables being spaced apart from one another by at least part of the first substrate.