Modular Fluid End Assembly for Hydraulic Fracturing
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Solution Overview
Problem
Conventional fluid ends used in hydraulic fracturing operations experience frequent failures due to extreme pressures, vibrations, and erosion from proppants, leading to short operational lifetimes and high maintenance costs.
Innovation Solution
A modular fluid end assembly design featuring multiple sections with interchangeable components, including a multi-piece housing and spacer sleeves, which allows for the replacement of worn parts without replacing the entire assembly, reducing stress concentrations and extending the lifespan of critical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluid ends are used under extreme hydraulic fracturing conditions, then they can deliver high pressure fluid volumes, but they experience frequent failures due to stress concentrations and structural damage
Solution Approach 1:
The housing is divided into multiple sections (first section, second section, third section) that can be separately manufactured, assembled, and replaced. This segmentation reduces stress concentrations at joints and allows individual sections to be replaced without replacing the entire housing assembly, thereby improving reliability while maintaining structural integrity under extreme pressures.
Solution Approach 2:
Different sections of the housing are designed with locally optimized properties - certain sections have reinforced walls or specific geometric features tailored to their functional requirements. This local quality optimization ensures that each section has adequate strength for its specific role while reducing overall stress concentrations, preventing structural failures.
2Reliability
If the entire fluid end assembly is replaced when components wear, then reliability is restored, but maintenance costs and downtime increase
Solution Approach 1:
The modular housing sections and interchangeable components (suction valve, discharge valve, plunger, packing) allow for selective replacement of only the worn or damaged parts. This eliminates the need to replace the entire assembly, significantly reducing maintenance downtime and costs while restoring reliability through targeted component replacement.
Solution Approach 2:
Worn or damaged components such as valves, packings, and plunger sections can be removed and replaced while retaining the functional housing sections. This selective replacement strategy recovers and reuses durable components, reducing waste and maintenance expenses while quickly restoring operational reliability.
3Ease of repair
If modular design with multiple sections is implemented, then component replacement is enabled and stress concentrations are reduced, but device complexity increases
Solution Approach 1:
The housing is segmented into standardized sections with consistent connection interfaces and mounting features. This segmentation enables easy removal and replacement of individual sections or components without requiring complex disassembly procedures. The modular structure simplifies repair operations while the standardized design minimizes the increase in overall device complexity.
Data Source
AI summary
A fluid end assembly made of a plurality of fluid end sections positioned in a side-by-side relationship. Each fluid end section comprises a plurality of individual components joined together in a row. Two sets of fasteners are used to secure various components of each fluid end section together. When the fluid end section is assembled, a first set of fasteners is in a spaced relationship with and faces a second set of fasteners. At least one component making up the multi-piece fluid end section is configured to have a plurality of stay rods attached thereto. The stay rods interconnect the fluid end assembly and a power end assembly.