Modular Fluid End Sections to Reduce Wear and Stress Cracking
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Solution Overview
Problem
Conventional fluid ends used in hydraulic fracturing operations experience frequent failures due to extreme pressures, vibrations, and abrasive conditions, leading to structural issues such as cracking and leakage, which necessitate frequent replacement.
Innovation Solution
The fluid end is designed with multiple sections instead of a single housing, eliminating intersecting bores that are common stress points, allowing for easier replacement of individual sections and reducing manufacturing costs and complexity, while using a modular power end and advanced sealing systems to enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single housing design with intersecting bores is used, then manufacturing complexity is high and stress concentration occurs, but structural integrity is maintained
Solution Approach 1:
The fluid end is divided into multiple independent sections (first section, second section, third section) instead of a single housing. Each section has its own bore and can be manufactured separately, eliminating the need for complex intersecting bores in a single piece while reducing stress concentration points.
2Reliability
If conventional fluid end design is used, then durability is limited under extreme conditions, but initial manufacturing cost is lower
Solution Approach 1:
The modular sectional design allows individual sections to be replaced when worn, extending the overall lifespan of the fluid end. While each section can be manufactured cost-effectively, the cumulative durability benefit comes from selective replacement rather than complete failure of the entire unit.
Solution Approach 2:
The design changes the operational parameters by distributing stress across multiple sections rather than concentrating it in a single housing, thereby improving durability under extreme pressures and vibrations without proportionally increasing manufacturing cost.
3Productivity
If modular sections are used, then replacement efficiency is improved and material costs are reduced, but device complexity increases
Solution Approach 1:
The fluid end is segmented into multiple independent sections that can be replaced individually. This modular approach allows worn sections to be swapped out without replacing the entire fluid end, significantly improving replacement efficiency and reducing downtime.
Solution Approach 2:
The design enables selective discarding and replacement of only the worn sections while retaining functional sections. This partial replacement strategy improves productivity by reducing replacement time and material costs compared to replacing the entire unit.
4Strength
If intersecting bores are eliminated, then stress points are reduced and section replacement is easier, but fluid routing complexity increases
Solution Approach 1:
By eliminating intersecting bores and using separate sections, the design reduces stress concentration points while managing fluid routing through standardized connections between sections. The fluid routing complexity is distributed across section interfaces rather than concentrated in complex internal bore intersections.
Data Source
AI summary
A fluid end comprising a plurality of fluid end sections positioned in a side-by-side relationship. Each fluid end section is releasably attached to a connect plate. Each connect plate is attached to a power source using a plurality of stay rods. Each fluid end section comprises a housing in fluid communication with a pair of intake manifolds and a discharge conduit. A fluid routing plug is installed within each housing and is configured to route fluid throughout the housing. A plunger is installed within stuffing box attached to each housing. A number of features, including the location of seals within bore walls and carbide inserts within valve guides, aid in reducing or transferring wear.