Frustoconical Cutting Elements Maintain Aggressiveness
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Solution Overview
Problem
Cutting elements for earth-boring tools experience wear and loss of aggressiveness due to the harsh downhole environment, leading to reduced effectiveness in removing earth material as they develop flat spots, known as 'wear flats' or 'wear scars'.
Innovation Solution
The use of a polycrystalline, superhard material with a greater diameter than the substrate, where the first greatest diameter of the superhard material is greater than the second greatest diameter of the substrate, and potentially the pocket diameter, to maintain cutting edge length and aggressiveness despite wear, through specific geometries and attachment methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If cutting elements are made with conventional geometries, then initial cutting performance is achieved, but aggressiveness is lost due to wear flat development
Solution Approach 1:
The cutting element geometry transitions from a conventional cylindrical shape to a frustoconical shape with an enlarged forward diameter. This dimensional change creates additional cutting edge length in the forward direction, which compensates for wear flat development and maintains aggressiveness throughout the service life of the cutting element.
Solution Approach 2:
The invention changes the geometric parameters of the cutting element by establishing a frustoconical shape with a forward diameter greater than the rear diameter. This parameter change increases the cutting edge length and creates a geometry that better accommodates wear, thereby maintaining cutting performance and aggressiveness over time.
2Productivity
If cutting elements wear in harsh downhole environments, then material removal occurs, but cutting edge length decreases leading to dullness
Solution Approach 1:
The frustoconical geometry with enlarged forward diameter provides additional cutting edge length in the forward direction. This extra length serves as a reserve that compensates for the loss of cutting edge length due to wear, thereby maintaining productivity and preventing dullness during operation.
Solution Approach 2:
The enlarged forward diameter is designed in advance to provide excess cutting edge length before wear begins. This preliminary provision of additional cutting edge material allows the element to withstand wear and maintain effective cutting edge length throughout its service life, ensuring continuous productivity.
Data Source
AI summary
Cutting elements for earth-boring tools may include a substrate and a polycrystalline, superhard material secured to an end of the substrate. A first, greatest diameter of the polycrystalline, superhard material may be greater than a second, greatest diameter of the substrate, as measured in a direction at least substantially parallel to a cutting face of the polycrystalline, superhard material. Methods of making cutting elements for earth-boring tools may involve securing a polycrystalline, superhard material to an end of a substrate. A first, greatest diameter of the polycrystalline, superhard material may be rendered greater than a second, greatest diameter of the substrate, as measured in a direction at least substantially parallel to a cutting face of the polycrystalline, superhard material.