Downhole Bit Cleaning Element With Offset Fluid Flow
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Solution Overview
Problem
Conventional downhole tools often fail to circulate drilling fluid effectively to the central region of a bit, leading to inefficient cutting removal and cooling, particularly in the center and nose regions, resulting in reduced efficiency and potential damage due to buildup of cuttings and material.
Innovation Solution
A cleaning cutting element is secured to the center region of the bit, with conduits directing drilling fluid from a substrate bore to exit openings that orient fluid flow towards junk slots and blades, improving fluid circulation and cooling, thereby enhancing cutting efficiency and reducing material buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional downhole tools are used, then the structure is simple, but fluid circulation to the central region is insufficient
Solution Approach 1:
The cleaning element is divided into multiple functional segments: a substrate bore for fluid intake, multiple conduits for fluid distribution, and offset openings for targeted fluid delivery. This segmentation allows the single cleaning element to effectively circulate fluid to multiple regions (central region, nose region, and along blades) simultaneously, resolving the contradiction between maintaining simple structure and achieving sufficient fluid circulation.
2Temperature
If typical downhole tools are used, then the design is conventional, but cooling efficiency in center and nose regions is poor
Solution Approach 1:
The cleaning element incorporates local quality by directing fluid flow to specific locations with different cooling requirements. The offset openings are strategically positioned to deliver fluid along the blades to engagement faces, while the substrate bore provides central region cooling. This localized fluid delivery ensures optimal cooling efficiency in each region, thereby maintaining high cutting efficiency throughout.
3Productivity
If conventional fluid circulation is used, then the system is simple, but cutting removal is inefficient
Solution Approach 1:
The cleaning element serves multiple functions simultaneously: it cleans the central region through the substrate bore, cools the nose region and blades through offset openings, and removes cuttings through fluid circulation along junk slots. This multi-functionality enables efficient cutting removal across all regions without requiring separate devices for each function, thus resolving the contradiction between productivity improvement and device 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
The solution improves fluid flow and cooling in the center and nose regions of the bit, enhancing cutting efficiency and preventing unwanted wear and damage by effectively flushing away cuttings and material.
Implementation Method 1
The cleaning element includes at least one opening for passing a fluid from the substrate bore and out of the downhole tool through the at least one junk slot. A flow direction of the at least one opening is offset from the longitudinal axis.
Implementation Method 2
improving fluid circulation and cooling, thereby enhancing cutting efficiency and reducing material buildup
Data Source
AI summary
A downhole tool includes a body having a longitudinal axis and a fluid passage extending through the body. The downhole tool includes at least one blade having one or more engagement faces thereon. At least one junk slot extends adjacent to the at least one blade. The downhole tool includes a cleaning element at the longitudinal axis of the body. The cleaning element has a substrate bore in fluid communication with the fluid passage. The cleaning element includes at least one opening or passing a fluid from the substrate bore and out of the downhole tool through the at least one junk slot. A flow direction of the at least one opening is offset from the longitudinal axis.