Flow Diverter Fillets and Wear Inserts for Drilling Motors
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Solution Overview
Problem
Conventional flow diverters in drilling motors experience washout due to turbulence and cavitation at the intersection of angled ports and the bore, leading to frequent replacement and reduced lifespan, as the existing cylindrical wear sleeves fail to adequately protect against this issue.
Innovation Solution
The introduction of a fluid handling device with curved transitional wall portions, or fillets, that smooth the transition between angled flow channels and the bore, reducing turbulence and cavitation, and an insert made of a more abrasion-resistant material to enhance wear resistance, which can be fabricated separately to facilitate easier production and improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional cylindrical wear sleeves are used to protect flow diverters, then ease of manufacture is improved, but reliability deteriorates due to inadequate protection against washout
Solution Approach 1:
The patent applies curvature by replacing the conventional cylindrical wear sleeve with a contoured wear sleeve that has a non-circular cross-section. The contoured shape is specifically designed to match the complex geometry of the flow diverter body, providing comprehensive coverage and protection against washout in all critical areas where fluid flow impacts the structure.
Solution Approach 2:
The contoured wear sleeve provides localized protection precisely where needed - at the intersection of the bore and angled ports where washout occurs. The sleeve's shape is optimized to cover specific vulnerable areas rather than providing uniform protection, allowing targeted reinforcement of the flow diverter at critical locations while maintaining manufacturing feasibility.
2Productivity
If flow diverters are designed with angled ports connecting annular conduit to central bore, then fluid handling capability is improved, but object-generated harmful factors worsen due to turbulence and cavitation causing washout
Solution Approach 1:
The contoured wear sleeve converts the harmful effects of turbulence and cavitation into beneficial protection. Instead of trying to eliminate the high-velocity fluid flow needed for productivity, the sleeve is designed to withstand and protect against these very conditions, transforming the potentially damaging environment into a controlled condition where the wear sleeve absorbs the harm while protecting the flow diverter body.
Solution Approach 2:
The solution employs a composite structure combining the flow diverter body with a separate contoured wear sleeve made of wear-resistant material. This composite approach allows the main body to be optimized for fluid handling while the sleeve provides specialized protection against washout, combining different material properties to achieve both productivity and durability.
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 effectively reduces washout by minimizing turbulence and cavitation, thereby extending the lifespan of flow diverters and improving their durability in drilling applications.
Implementation Method 1
The transitional wall portions are configured to be sufficiently smooth and to have sufficient radius of curvature to prevent cavitation within the flow channel at the transitional wall portions and immediately downstream of the transitional wall portions
Implementation Method 2
Conventional flow diverter designs can have various angles of the ports relative to the bore... This flow of mud through the angled ports into the bore can result in washout in the walls of the diverter at or near the intersection of the bore and the ports
Data Source
AI summary
A flow diverter for connecting a central bore to an outer conduit. The flow diverter defines a portion of the central bore and angled flow passages connecting the portion of the central bore to the outer conduit. Rounded edges between the central bore and angled flow passages reduce cavitation and/or turbulence. The rounded edges and an adjacent portion of the central bore may be defined by an insert.