Modular Gland Seal Positions for Eroded Fluid End Housings
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Solution Overview
Problem
Fluid end assemblies in oil and gas operations suffer from leakage due to erosion of sealing surfaces caused by corrosive and abrasive fluids, leading to the need for premature replacement of the housing.
Innovation Solution
A system where seals are relocatable within recessed spaces in closure elements, allowing them to engage with new, non-eroded sealing surfaces as erosion occurs, thereby extending the life of the fluid end housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If seals are fixed in position within closure elements, then the structure is simple and easy to manufacture, but the sealing surfaces erode prematurely requiring housing replacement
Solution Approach 1:
The closure element is segmented into multiple sections, each with its own seal positioned at different axial locations. This allows individual seals to be replaced or repositioned independently, extending housing life without requiring complete closure element replacement.
Solution Approach 2:
The seal positions are made adjustable along the closure element body through threaded holes and positioning mechanisms. This dynamic positioning capability allows seals to be relocated to fresh sealing surfaces on the housing, preventing premature erosion damage from becoming permanent.
2Reliability
If multiple seals are positioned at different axial locations on the closure element, then leakage is prevented by maintaining sealing integrity, but the manufacturing and assembly complexity increases
Solution Approach 1:
Multiple closure elements are designed with identical or similar structures, each capable of receiving seals at various axial positions. This universality allows standardized manufacturing processes and interchangeable parts, reducing overall complexity despite the multi-seal configuration.
Solution Approach 2:
The closure elements are pre-configured with threaded holes and positioning features during manufacturing that accommodate seal installation at multiple axial locations. This preliminary preparation simplifies field assembly and maintenance by eliminating the need for complex custom modifications.
Data Source
AI summary
A closure element for a fluid end assembly that has two or more recessed grooves formed in its outer surface. The grooves are axially offset. A seal is placed in one and only one of the grooves. As wear occurs, the seal is relocated to one of the other grooves. Instead of a series of axially offset grooves in a single closure element, a kit may be formed from two or more otherwise identical closure elements, each with a single recessed groove at a different axial position. Another closure element has a series of ledge-like surfaces defining spaces within which a seal may be received. One outer surface surrounds one or more of the other surfaces. A seal is placed in one and only one of the spaces. As wear occurs, the seal is relocated to one of the other spaces.