Asymmetric Rolling Cone Drill Bit Inserts for Wear Reduction
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Solution Overview
Problem
Conventional rolling cone drill bits experience premature wear and reduced rate of penetration due to uniform orientation of cutting elements, which does not account for the kinematics of the bit and cone rotations, leading to inefficient drilling and frequent bit replacements.
Innovation Solution
The drill bit design incorporates asymmetric inserts with varying leading geometries at different radial positions, oriented to account for the combined effects of bit and cone rotations, ensuring that inserts move in the same or opposite directions to optimize impact and support during drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cutting elements are uniformly oriented on rolling cone cutters, then manufacturing is simplified, but wear increases and rate of penetration decreases
Solution Approach 1:
The patent applies asymmetry by orienting cutting elements with different leading geometries at different radial positions on the rolling cone cutters. Specifically, cutting elements at smaller radial positions have a first leading geometry while those at larger radial positions have a second leading geometry. This asymmetric orientation accounts for the combined kinematics of bit rotation and cone rotation, ensuring that each cutting element's leading geometry is optimized for its specific operational direction, thereby reducing wear and improving durability while maintaining manufacturability.
Solution Approach 2:
The patent implements local quality by providing different leading geometries for cutting elements based on their radial position. The first leading geometry is used for cutting elements at smaller radial positions, while the second leading geometry is used for cutting elements at larger radial positions. This localized geometric variation optimizes the cutting performance and wear resistance of each specific region of the cutter, addressing the unique kinematic conditions at different radial locations.
2Device complexity
If cutting elements are uniformly oriented on rolling cone cutters, then manufacturing complexity is reduced, but rate of penetration decreases
Solution Approach 1:
The patent applies asymmetry by orienting cutting elements with different leading geometries at different radial positions on the rolling cone cutters. Specifically, cutting elements at smaller radial positions have a first leading geometry while those at larger radial positions have a second leading geometry. This asymmetric orientation accounts for the combined kinematics of bit rotation and cone rotation, ensuring that each cutting element's leading geometry is optimized for its specific operational direction, thereby reducing wear and improving durability while maintaining manufacturability.
Solution Approach 2:
The patent implements local quality by providing different leading geometries for cutting elements based on their radial position. The first leading geometry is used for cutting elements at smaller radial positions, while the second leading geometry is used for cutting elements at larger radial positions. This localized geometric variation optimizes the cutting performance and wear resistance of each specific region of the cutter, addressing the unique kinematic conditions at different radial locations.
3Ease of manufacture
If conventional cutting element orientation is used, then manufacturing is simpler, but frequent bit replacements are required
Solution Approach 1:
The patent applies asymmetry by orienting cutting elements with different leading geometries at different radial positions on the rolling cone cutters. Specifically, cutting elements at smaller radial positions have a first leading geometry while those at larger radial positions have a second leading geometry. This asymmetric orientation accounts for the combined kinematics of bit rotation and cone rotation, ensuring that each cutting element's leading geometry is optimized for its specific operational direction, thereby reducing wear and improving durability while maintaining manufacturability.
Solution Approach 2:
The patent implements local quality by providing different leading geometries for cutting elements based on their radial position. The first leading geometry is used for cutting elements at smaller radial positions, while the second leading geometry is used for cutting elements at larger radial positions. This localized geometric variation optimizes the cutting performance and wear resistance of each specific region of the cutter, addressing the unique kinematic conditions at different radial locations.
Data Source
AI summary
A rolling cone drill bit for drilling a borehole in earthen formations. In an embodiment, the bit comprises a bit body. In addition, the bit comprises a cone cutter mounted on the bit body and adapted for rotation about a cone axis in a cutting direction. Further, the bit comprises at least one transition insert mounted to the cone cutter. Still further, the bit comprises a first asymmetric insert mounted to the cone cutter. Moreover, the bit comprises a second asymmetric insert mounted to the cone cutter. Each insert includes a cutting surface with a leading side relative to the cutting direction. The leading side of the first asymmetric insert has a leading geometry and the leading side of the second asymmetric insert has a leading geometry that is different than the leading geometry of the first asymmetric insert.