High Density Row Roller Cone Bit Tooth Configuration
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Solution Overview
Problem
Conventional earth-boring bits face issues with tracking and balling during drilling in plastic formations, where teeth fall into indentations and formation material becomes packed, leading to reduced penetration rates and inefficient drilling.
Innovation Solution
The design features a rolling cone earth-boring bit with a high-density row of teeth spaced farther from the bit axis and having a lesser pitch than adjacent rows, with inner and outer grooves to prevent buildup and promote deeper penetration, and intermeshing teeth to break up rock formations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If teeth are closely spaced to reduce tracking, then penetration rate improves, but balling occurs more readily between teeth
Solution Approach 1:
The patent applies local quality by creating a high-density tooth row at a specific location (intermediate row) while maintaining conventional tooth spacing in other rows. This localized increase in tooth density reduces tracking at critical penetration points without causing balling across the entire bit face, as only specific areas have closely spaced teeth.
Solution Approach 2:
The patent segments the tooth structure into multiple rows with different densities. The high-density intermediate row is separated from the low-density outer and inner rows by grooves, creating distinct functional zones. This segmentation allows each row to perform its specific function: the high-density row prevents tracking while the low-density rows minimize balling.
2Object-affected harmful factors
If teeth are widely spaced to prevent balling, then material buildup is reduced, but tracking increases and penetration rate decreases
Solution Approach 1:
The patent applies local quality by creating a high-density tooth row at a specific location (intermediate row) while maintaining conventional tooth spacing in other rows. This localized increase in tooth density reduces tracking at critical penetration points without causing balling across the entire bit face, as only specific areas have closely spaced teeth.
Solution Approach 2:
The patent segments the tooth structure into multiple rows with different densities. The high-density intermediate row is separated from the low-density outer and inner rows by grooves, creating distinct functional zones. This segmentation allows each row to perform its specific function: the high-density row prevents tracking while the low-density rows minimize balling.
3Ease of manufacture
If conventional tooth arrangement is used, then manufacturing is simple, but both tracking and balling occur simultaneously
Solution Approach 1:
The patent applies local quality by creating a high-density tooth row at a specific location (intermediate row) while maintaining conventional tooth spacing in other rows. This localized increase in tooth density reduces tracking at critical penetration points without causing balling across the entire bit face, as only specific areas have closely spaced teeth.
Solution Approach 2:
The patent segments the tooth structure into multiple rows with different densities. The high-density intermediate row is separated from the low-density outer and inner rows by grooves, creating distinct functional zones. This segmentation allows each row to perform its specific function: the high-density row prevents tracking while the low-density rows minimize balling.
Data Source
AI summary
An earth-boring bit has a high density row on one of its cones. Each cone has a nose area and a gage area with a heel row of teeth at the gage area. One of the cones has a farther intermediate row of teeth and another one of the cones has a closer intermediate row of teeth. The remaining cone has a high density row of teeth, which is located closer to the axis of rotation of the bit than the farther intermediate row and farther from the axis of rotation of the bit than the closer intermediate row. The high density row has a smaller pitch between crests of the teeth than the closer and farther intermediate rows. The smaller pitch provides more teeth in the high density row than in the closer intermediate row and the farther intermediate row.