Core Bit Design Reducing Cutting Forces
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Solution Overview
Problem
Existing core bits cause significant cutting and friction forces during coring operations, leading to wear, fracturing, and jamming of rock samples, which can result in inaccurate data and increased operational costs.
Innovation Solution
A core bit design that minimizes forces on the core sample by modifying cutting element size, orientation, and geometry, using a modeling system to simulate forces and adjust the design to reduce cutting and friction forces, thereby preventing damage and jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional core bits with standard cutting elements are used, then drilling efficiency is maintained, but cutting and friction forces cause core sample damage, wear, and jamming
Solution Approach 1:
The patent applies local quality by modifying specific cutting elements at different locations on the core bit. Cutting elements near the core center have different geometry and orientation compared to those at the periphery, with each positioned to minimize forces on the core sample while maintaining effective cutting at its specific location.
Solution Approach 2:
The patent changes physical parameters of cutting elements including size, orientation angles, and geometry. By adjusting these parameters, the cutting and friction forces acting on the core sample are reduced, preventing damage and jamming while maintaining drilling effectiveness.
2Productivity
If larger cutting elements are used to increase cutting efficiency, then drilling productivity improves, but forces on the core sample increase causing damage and wear
Solution Approach 1:
The patent segments the cutting function across multiple cutting elements of varying sizes distributed around the core bit perimeter. This segmentation allows the total cutting workload to be distributed, maintaining productivity while each individual element exerts reduced force on the core sample compared to a single large cutter.
Solution Approach 2:
Different cutting elements have different sizes and geometries optimized for their specific positions. Elements at different radial locations have tailored dimensions that balance cutting efficiency with force reduction, ensuring productive drilling without excessive core sample stress.
3Speed
If cutting elements are oriented for maximum material removal, then drilling speed increases, but friction forces increase causing core sample jamming
Solution Approach 1:
The patent optimizes the orientation parameters of cutting elements by adjusting their angular positions and tilt angles. This parameter optimization achieves an balance where material removal efficiency is maintained while friction forces acting on the core sample are minimized, preventing jamming in the core barrel.
Data Source
AI summary
A method for designing a core bit to control and reduce the cutting forces acting on a core of rock is disclosed. The method includes generating a model of a core bit including a plurality of cutting elements on a plurality of blades. The method may additionally include simulating a coring operation with the model of the core bit. The method may further include calculating at least one force vector generated by at least one of the plurality of cutting elements on the model of the core bit during the coring operation. The method may further include determining at least one force acting on a core in the model of the core bit based on the at least one force vector and generating a design of the core bit based on the at least one force acting on the core.