Split Blade Drill Bit With Opposing Helix Angles
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Solution Overview
Problem
Existing drilling tools face challenges in optimizing design variables for one formation, leading to compromised performance or durability in other conditions, especially in long drilling intervals with varying lithologies, resulting in increased costs and downtime.
Innovation Solution
A drill bit design featuring blades that split in opposing directions due to helix angle differentials, creating varying rotational distances and load distributions based on depth of cut, with forward and rearward sweeping portions for enhanced hydraulic cleaning and cooling, and multiple gauge pads for stability across diverse formations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cutting structures are optimized for one formation, then performance in that formation is improved, but durability and performance in other formations deteriorate
Solution Approach 1:
The blade is segmented into multiple portions (first portion, second portion, third portion) with different helix angles, allowing each segment to handle different formation types and depth of cut conditions independently while working together as a unified cutting structure
Solution Approach 2:
Different portions of the blade have locally optimized properties: the first portion has a first helix angle optimized for certain formations, the second portion has a second helix angle for other formations, and the third portion has a third helix angle for yet another formation type, allowing the single blade to adapt to varying lithologies without sacrificing performance or durability
2Ease of manufacture
If blades are designed with uniform helix angles, then manufacturing is simplified, but performance across varying depth of cut and formations deteriorates
Solution Approach 1:
The blade is divided into multiple manufacturable segments with different helix angles, where each segment can be manufactured using standard processes, then assembled into a complete blade that delivers superior multi-formation performance
Solution Approach 2:
The blade employs asymmetric helix angles across its different portions rather than uniform symmetry, with the first portion having a first helix angle, the second portion having a second helix angle, and the third portion having a third helix angle, optimizing performance for varying depth of cut and formation types while remaining manufacturable
3Device complexity
If a single blade design is used for all formations, then device complexity is reduced, but adaptability to different lithologies deteriorates
Solution Approach 1:
The blade is designed as a universal cutting structure that performs multiple functions across different formations and drilling conditions by incorporating multiple portions with different helix angles, allowing a single blade design to replace multiple specialized blades while maintaining adaptability to varying lithologies
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design allows for optimized performance across a wide range of formations and downhole conditions, reducing downtime and costs by maintaining efficiency in varying lithologies without needing bit transitions, and improving cutting element longevity through differential loading and hydraulic support.
Implementation Method 1
a first blade having a leading portion and a trailing portion, wherein the leading portion is disposed on the first gauge pad with a negative helix angle and the trailing portion is disposed on the second gauge pad with a positive helix angle
Data Source
AI summary
Drilling bits for removing material from a formation are provided. One such bit includes a bit body including a first gauge pad and a second gauge pad. The bit further includes a first blade including a leading portion and a trailing portion, where the leading portion is disposed on the first gauge pad with a negative helix angle and the trailing portion is disposed on the second gauge pad with a positive helix angle.