Convex Ridge Non-Planar Cutting Tooth for Drill Bit Impact Resistance
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Solution Overview
Problem
Diamond drill bits used in petroleum exploration face issues with impact damage and debris balling, leading to reduced mechanical speed and increased economic costs due to poor impact resistance and balling resistance, especially in high gravel or hard formations.
Innovation Solution
The design incorporates a convex ridge type non-planar cutting tooth with a cylindrical body featuring a main cutting convex ridge and two non-cutting convex ridges on a polycrystalline diamond layer, which improves impact and balling resistance by allowing debris to be automatically separated and carried away, reducing the risk of bit balling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If diamond composite sheet cutting tooth is used, then cutting ability is improved, but impact resistance deteriorates
Solution Approach 1:
The cutting tooth is segmented into multiple functional zones: a flat portion for primary cutting, a convex portion for impact resistance, and a concave portion for debris evacuation. This segmentation allows each zone to perform its specific function optimally, resolving the contradiction between cutting ability and impact resistance.
Solution Approach 2:
Different portions of the cutting tooth have different geometric properties tailored to specific functions: the flat portion provides a large cutting surface for efficient rock cutting, while the convex portion provides structural strength for impact resistance. This local differentiation of properties resolves the contradiction between cutting performance and durability.
2Productivity
If diamond composite sheet cutting tooth is used, then cutting efficiency is improved, but balling resistance deteriorates
Solution Approach 1:
The cutting tooth geometry is segmented to include a concave portion that creates a debris channel, separating the cutting function from the debris accumulation zone. This segmentation prevents debris from adhering to the cutting face, resolving the balling resistance issue while maintaining cutting efficiency.
Solution Approach 2:
The cutting tooth transitions from a traditional planar geometry to a three-dimensional form with convex and concave portions. This dimensional change creates new spatial relationships that facilitate debris evacuation and prevent balling, while the flat portion maintains effective cutting contact.
3Ease of manufacture
If traditional cutting tooth geometry is used, then manufacturing simplicity is maintained, but debris evacuation capability deteriorates
Solution Approach 1:
The cutting tooth incorporates convex and concave curved portions instead of traditional flat geometry. These curvatures are designed to naturally guide and evacuate debris away from the cutting face, improving debris evacuation capability while remaining manufacturable using standard dental or tool manufacturing processes.
Data Source
AI summary
The present invention provides non-planar cutting tooth and a diamond drill bit. The non-planar cutting tooth and the diamond drill bit have great ability of impact resistance and balling resistance. According to the features of drilled formation, cutting teeth are arranged on the drill bit with different mode, which can improve the mechanical speed and footage of the drill bit.