Multiple Ridge Diamond Compact Drill Bit Impact Resistance
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Solution Overview
Problem
Diamond compact in drill bits experiences tooth chipping and failure due to high impact loads in complex formations, leading to reduced drilling efficiency and short service life, despite efforts to enhance impact resistance through interface modifications and material changes.
Innovation Solution
A multiple ridge diamond compact with a cemented carbide substrate and diamond composite layer featuring angled ridges that converge to form a concave cutting edge, providing enhanced cutting and impact resistance, and allowing for staggered wear and rotation of cutting edges for prolonged use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the diamond compact uses traditional flat or simple-shaped cutting edges, then the manufacturing is simple, but the impact resistance is poor leading to tooth chipping and failure
Solution Approach 1:
The cutting edge is designed with a concave curved surface instead of a flat or simple shape. This concave curvature allows the cutting edge to better absorb and distribute impact loads, preventing tooth chipping and failure while maintaining manufacturing feasibility through standard diamond compact formation processes.
2Strength
If special-shaped PCD teeth (ball head or cone shape) are used to improve impact resistance, then the impact resistance increases, but the drilling and cutting resistance increases leading to high torque and low drilling efficiency
Solution Approach 1:
The concave curved cutting edge design optimizes the balance between impact resistance and cutting efficiency. The curved geometry allows for effective rock fragmentation while maintaining lower cutting resistance compared to ball head or cone shapes, thus reducing torque and improving drilling efficiency.
Solution Approach 2:
The concave curvature is specifically applied at the cutting edge portion where impact resistance is most needed, while the rest of the diamond compact body maintains its structural integrity and cutting performance characteristics. This localized geometric modification optimizes performance without compromising overall drilling efficiency.
3Duration of action of stationary object
If the diamond compact is designed for strong impact resistance, then the service life should be prolonged, but the complex formation conditions cause frequent tooth failure reducing actual service life
Solution Approach 1:
The concave curved cutting edge provides superior impact resistance by distributing stress more evenly across the tooth structure, significantly reducing the frequency of tooth failure in complex formations and thereby extending the actual service life of the drill bit.
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 design improves drilling performance by pre-crushing formations, reducing cutting resistance, increasing penetration rate, and extending the drill bit's service life through effective cutting edge management and enhanced impact resistance.
Implementation Method 1
the formation is first pre-crushed by means of the ridges angled relative to each other
Implementation Method 2
converging ends of two adjacent ridges extend to an edge of the diamond composite layer so as to form a concave cutting edge portion
Data Source
AI summary
The disclosure relates to a multiple ridge diamond compact for a drill bit, comprising a hard alloy substrate (cemented carbide substrate) (102) and a diamond composite layer (101), wherein an end surface of the diamond composite layer is provided with at least two ridges angled relative to each other, and converging ends of two adjacent ridges extend to an edge of the diamond composite layer (101) so as to form a concave cutting edge portion on the edge. The plurality of ridges angled relative to each other are set as a cutting surface group to simultaneously cut a formation, the formation is first pre-crushed by means of the ridges angled relative to each other, the ridges first enter the formation from sharp surfaces (the converging ends of the ridges), a crushing pit in the direction of the ridges is further enlarged, and then the formation is further extruded and crushed by inclined surfaces on two sides of the group of ridges, such that the cutting surfaces thereof have a plowing effect, thus improving the crushing and drilling performance of the diamond compact, reducing the drilling cutting resistance, and further increasing the mechanical drilling speed (rate of penetration) of the diamond drill bit.