Earth Boring Tool Cutter Side Rake Arrangement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional earth boring tools with fixed cutters face inefficiencies in chip removal and evacuation, drilling efficiency, and depth of cut management due to uniform cutter orientations and arrangements.
Innovation Solution
The arrangement of fixed cutters with varying side inclinations in predetermined patterns, including alternating side rake and lateral rake angles, enhances chip removal and evacuation, drilling efficiency, and depth of cut management by strategically positioning and orienting cutters to manage reactive forces and rock fracture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform cutter orientations are used in conventional earth boring tools, then manufacturing and assembly are simplified, but chip removal and evacuation efficiency deteriorate
Solution Approach 1:
The patent applies local quality by varying the side rake angles of cutters at different positions along the cutting profile. Cutters near the gauge have different side rake angles than cutters near the center, optimizing chip removal at each specific location rather than using a uniform configuration throughout.
Solution Approach 2:
The patent changes the side rake angle parameter of cutters based on their position along the cutting profile. This parameter variation allows optimization of cutting performance and chip evacuation at different radial positions, transitioning from uniform to non-uniform cutter orientation.
2Stability of the object's composition
If fixed cutter arrangements are used for stable drilling, then drilling efficiency and depth of cut management deteriorate
Solution Approach 1:
The patent implements local quality by positioning cutters with specific side rake angles at specific locations along the cutting profile. This localized optimization improves depth of cut management and drilling efficiency while maintaining overall drilling stability through the structured arrangement.
Solution Approach 2:
The patent introduces dynamic characteristics by varying cutter orientations to adapt to different cutting conditions at different positions. The non-uniform side rake angle distribution allows the tool to better manage reactive forces and depth of cut variations during rotation, improving drilling efficiency.
3Strength
If cutters are positioned to optimize rock fracture, then vibration and torque increase
Solution Approach 1:
The patent changes the side rake angle parameter of cutters based on their position to optimize rock fracture effectiveness. By varying this parameter along the cutting profile, the tool achieves better rock breaking while the distributed arrangement helps manage the resulting forces to control vibration and torque.
4Ease of manufacture
If uniform side rake angles are used on all cutters, then manufacturing is simplified, but depth of cut management and steerability worsen
Solution Approach 1:
The patent applies local quality by assigning different side rake angles to cutters at different positions along the cutting profile. This localized differentiation enables better depth of cut management and steerability control, allowing the tool to adapt to varying cutting conditions at different radial positions.
Solution Approach 2:
The patent segments the cutter arrangement into different groups based on their position along the cutting profile, with each group having optimized side rake angles. This segmentation allows independent optimization of cutters at different locations, improving overall tool performance and adaptability.
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
This configuration improves drilling efficiency by reducing vibration and torque, enhancing rock fracture communication, and optimizing chip removal and evacuation, while allowing for better steerability and depth of cut management through variable elliptical cut shapes and strategic placement of backup cutters.
Implementation Method 1
the cutters collectively present one or more predetermined cutting profiles to the earth formation, shearing the formation, A cutting profile is defined by the position and orientation of each of the cutters
Implementation Method 2
resulting in formation of small chips that are then evacuated hydraulically by drilling fluid pumped through carefully placed nozzles in the body of the tool
Data Source
Figure 1~2B
Figure 3A~3B
Figure 3C~4
AI summary
A rotary apparatus for earth boring operations has a body with a central axis, about which the apparatus rotates and a plurality of cutters arrayed on the body in fixed positions. The plurality of cutters collectively defines at least a portion of a cutting profile for the bit when it is rotated. Each of the group of cutters has a cutting face, a predetermined radial position within the cutting profile, and a predetermined side inclination angle. The plurality of cutters comprises a first group of at least two adjacent cutters, and a second group also of at least two adjacent cutters. The side inclination angles of the cutters in the first group change consecutively from one cutter to the next adjacent cutter in a first direction; and the side inclination angles of the cutters in the second group change consecutively from one cutter to the next adjacent cutter in a second direction opposite to the first direction.