Hybrid Drill Bit Variable Cutter Exposure Profile
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Solution Overview
Problem
Existing hybrid drill bits face challenges in maintaining efficient drilling performance due to bit whirling and wear issues, particularly in the nose and shoulder sections, where roller cone and fixed blade cutting elements often fail to optimize material removal and stability.
Innovation Solution
The design incorporates a hybrid earth boring drill bit with a bit body featuring cone, nose, shoulder, and gage sections, where the fixed cutter profile extends beyond the roller cutter profile in some sections, and vice versa, allowing for optimized cutting element exposure and distribution across the bit profile to enhance drilling efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If roller cone and fixed blade cutting elements are used in hybrid drill bits, then material removal efficiency is improved, but bit whirling and wear issues occur in the nose and shoulder sections
Solution Approach 1:
The patent applies different cutting element configurations to different sections of the bit. The nose section has roller cones with larger diameter for crushing and fracturing, while the shoulder section has fixed blades for cutting. This local differentiation optimizes both material removal efficiency and bit stability in each specific zone, resolving the contradiction between productivity and reliability.
Solution Approach 2:
The bit is divided into distinct functional sections (nose, shoulder, gage) with different cutting element types. The nose section uses roller cones for fracturing, the shoulder section uses fixed blades for cutting, and the gage section maintains bit stability. This segmentation allows each section to perform its optimal function, improving overall productivity while maintaining reliability.
2Productivity
If cutting elements are concentrated in specific sections, then material removal is enhanced, but wear and stress distribution become uneven
Solution Approach 1:
Different cutting elements are placed in different sections based on local requirements. The nose section has roller cones for high stress fracturing, while the shoulder section has fixed blades for cutting. This local quality differentiation ensures that each section handles the appropriate type of material removal, distributing wear and stress more evenly across the bit, thereby extending service life while maintaining high productivity.
3Reliability
If fixed blade cutting elements extend beyond roller cone cutting elements, then bit whirling is reduced, but penetration rate may be compromised
Solution Approach 1:
The bit is segmented into sections with different cutting element configurations. The nose section has roller cones that extend further for crushing and fracturing, while the shoulder section has fixed blades that provide stability. This segmentation allows the bit to achieve both stability and penetration rate in different zones, resolving the contradiction between reliability and productivity.
Data Source
AI summary
An earth boring drill bit comprising a bit body having a bit profile including nose, shoulder, and gage sections; a plurality of fixed cutting elements secured to the body and defining a fixed cutter profile; and a roller cone rotatably secured to the body, the roller cone having a plurality of roller cone cutting elements defining a roller cutter profile, wherein the fixed cutter profile extends beyond the roller cutter profile in at least one of the sections and the roller cutter profile extends beyond the fixed cutter profile in at least one of the sections. The roller cutter profile may extend beyond the fixed cutter profile in the shoulder and gage sections, possibly with the fixed cutter profile extending beyond the roller cutter profile in the nose section and/or a cone section.