Cleaning Cutting Element With Fluid Conduits for Bit Center Cuttings Removal
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Solution Overview
Problem
Existing wellbore drilling bits face inefficiencies in fluid flow and cutting removal in the center and nose regions, leading to reduced cutting efficiency and buildup of cuttings.
Innovation Solution
A bit design featuring a cleaning cutting element with an ultrahard layer and a substrate, including a substrate bore and conduits that direct drilling fluid to exit openings, enhancing fluid circulation and cutting removal in the center region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional bit design is used, then manufacturing simplicity is maintained, but fluid flow and cutting removal efficiency in center and nose regions deteriorates
Solution Approach 1:
The cutting element is segmented into distinct functional zones: a substrate bore for fluid intake, multiple conduits for fluid distribution, and exit openings for fluid discharge. This segmentation allows drilling fluid to be delivered to specific regions (center and nose) to enhance cutting removal efficiency without requiring complete redesign of the entire bit structure.
Solution Approach 2:
The invention implements local quality by providing enhanced fluid flow specifically to the center and nose regions of the bit where cutting removal is most challenging. The substrate bore and conduits are strategically positioned to deliver drilling fluid precisely where needed, rather than applying a uniform design across the entire bit, thus improving productivity in critical areas without proportionally increasing overall complexity.
2Productivity
If conventional fluid flow paths are used, then device simplicity is maintained, but fluid circulation in center region deteriorates
Solution Approach 1:
The invention transitions from conventional two-dimensional fluid flow paths on the bit surface to a three-dimensional subsurface flow network. The substrate bore extends into the cutting element, and multiple conduits branch out in three dimensions to reach the center and nose regions, enabling effective fluid circulation in previously hard-to-reach areas without excessive complexity.
3Productivity
If ultrahard layer is added to cutting element, then cutting efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The cutting element uses composite construction with a substrate material base and an ultrahard layer (such as polycrystalline diamond or cubic boron nitride) applied to the cutting surface. This composite approach enhances cutting efficiency by combining the toughness of the substrate with the extreme hardness of the ultrahard coating, while the modular nature allows the ultrahard layer to be applied only where needed, managing manufacturing complexity.
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
Improved fluid flow and cutting removal efficiency in the center and nose regions of the bit, reducing buildup and enhancing overall drilling performance.
Implementation Method 1
A substrate bore is in fluid communication with a fluid passage of the inner body. A plurality of conduits are in fluid communication with the substrate bore. Each conduit of the plurality of conduits include an exit opening directing drilling fluid out of the body of the bit
Data Source
AI summary
A cleaning cutting element includes an ultrahard layer joined to a substrate. The substrate includes a substrate bore formed at least partially therethrough. The substrate includes a plurality of conduits that extend from the substrate bore at a junction. The conduits exit the substrate at an exit opening in the circumferential wall to direct drilling fluid to a feature of the bit to which the cleaning cutting element is secured.