Ceramic Floating Seal Assembly for High-Pressure Drilling
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Solution Overview
Problem
Existing swivel seal assemblies in drilling rigs have a limited lifetime due to high wear and abrasion from differential pressure, leading to frequent replacements and extended downtime, especially when operating at high pressures and speeds.
Innovation Solution
A floating seal assembly with ceramic sealing rings mounted to a non-rotating washpipe and a rotating conduit member, featuring a tubular floating seal guide with anti-rotation pins and a secondary U-cup seal member, allowing for directional fluid flow and easy replacement, with the ability to flip the sealing rings for extended operational life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rotary seals are used to provide dynamic sealing between washpipe and rotating sealing housing, then sealing function is achieved, but seal lifetime is limited to 200 hours or less due to high wear and abrasion
Solution Approach 1:
The patent changes the material parameter from elastomeric material to ceramic material for the seal members. This material parameter change provides superior wear and abrasion resistance, extending seal lifetime from 200 hours or less to significantly longer operational periods while maintaining the sealing function under high pressure drilling conditions
Solution Approach 2:
The patent employs ceramic seal members mounted in metal holders, creating a composite structure that combines the wear resistance of ceramic materials with the mechanical strength and mounting compatibility of metal components. This composite approach resolves the contradiction by leveraging the strengths of different materials to achieve both durability and functional requirements
2Reliability
If U-cup seal members are positioned between floating seal member and washpipe extension, then sealing function is achieved, but rapid failure occurs due to exposure to high pressure abrasive drilling fluid
Solution Approach 1:
The patent introduces a shield or protective structure as an intermediary element that positions the U-cup seal member away from direct exposure to abrasive drilling fluid. This intermediary protection allows the seal to function without rapid failure from abrasive contact, extending the seal assembly lifetime while maintaining the necessary sealing function
Solution Approach 2:
The patent employs sacrificial ceramic seal members that can be easily replaced. These durable but replaceable components are designed to withstand abrasive conditions longer than traditional seals, and when worn, can be quickly swapped out, minimizing downtime and effectively managing the abrasive fluid exposure issue
3Ease of repair
If complex stacked rotary seal assemblies are used, then sealing function is achieved, but replacement is time-consuming and difficult, extending downtime
Solution Approach 1:
The patent divides the seal assembly into separate, modular components: ceramic seal members mounted in individual metal holders that can be independently accessed and replaced. This segmentation eliminates the complexity of stacked assemblies, allowing rapid replacement of worn seals without disassembling multiple components, thereby reducing replacement downtime and improving ease of repair
Solution Approach 2:
The patent extracts the sealing function from complex stacked assemblies and implements it through simple, removable ceramic seal members in holders. This extraction simplifies the overall structure, making replacement straightforward and significantly reducing the time required for maintenance operations
Data Source
AI summary
A coupling seal assembly is described for directing a pressurized abrasive fluid between a non-rotating conduit member and a rotating second conduit member. The seal assembly includes a first ceramic floating seal member secured to the non-rotating conduit member and a second ceramic seal member secured to the rotating conduit member. Enhanced service life of the seal assembly under high pressures and high rotary speeds is achieved.