Polycrystalline Diamond Cutter Edge Geometry for Stress Relief
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Solution Overview
Problem
Cutting elements used in down-hole drilling operations face stress-related issues such as spalling, delamination, and fracture due to intense forces and temperature differentials, leading to reduced durability and wear life.
Innovation Solution
The cutting elements feature a unique geometry with protrusions spaced apart from the edge, a chamfer around the periphery, and a lower portion with limited axial height, which reduces stress accumulation at the edge and enhances durability by distributing stress and improving cutting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a super hard material layer is used to penetrate hard and abrasive earthen formations, then cutting effectiveness is improved, but stress-related issues such as spalling, delamination, and fracture occur due to intense forces and temperature differentials
Solution Approach 1:
The cutting element incorporates a lower portion with different geometric properties (reduced axial height) compared to the main body, creating local structural variation. This lower portion is positioned specifically at the base of the protrusions near the edge, providing localized stress relief where it is most needed while maintaining the overall cutting effectiveness of the super hard material layer.
2Reliability
If the cutting element geometry is modified to reduce stress accumulation, then durability is improved, but cutting efficiency may be reduced
Solution Approach 1:
The cutting face is segmented into distinct geometric features including protrusions and a lower portion with limited axial height. This segmentation allows different regions to serve different functions: the protrusions maintain cutting effectiveness while the lower portion provides stress relief, achieving both durability and cutting efficiency simultaneously.
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 design effectively increases the durability of the cutting elements and maintains higher rock cutting efficiency by reducing stress at the edge and improving the cutting action, as demonstrated by finite element analysis.
Implementation Method 1
The substrates and adjacent diamond grain layers are then compressed under HPHT conditions which promotes a sintering of the diamond grains to form a polycrystalline diamond structure. As a result, the diamond grains become mutually bonded to form a diamond layer over the substrate interface. The diamond layer is also bonded to the substrate interface.
Implementation Method 2
a cutting face with a geometry including at least one protrusion spaced a radial distance apart from an edge of the cutting element, the edge extending around an entire periphery of the cutting face, and a lower portion extending within the distance between the at least one protrusion and the edge, wherein a lower portion axial height measured between the edge and a base of the at least one protrusion is less than 30 percent of a greatest axial height of the at least one protrusion measured between the base of the at least one protrusion and an axially highest point of the at least one protrusion
Data Source
AI summary
A cutting element has a cutting face with a geometry including at least one protrusion spaced a radial distance apart from an edge of the cutting element, the edge extending around an entire periphery of the cutting face, and a lower portion extending within the distance between the at least one protrusion and the edge, wherein a lower portion axial height measured between the edge and a base of the at least one protrusion is less than 30 percent of a greatest axial height of the at least one protrusion measured between the base of the at least one protrusion and an axially highest point of the at least one protrusion.