Top Pot Assembly Quick Attachment System for Seal Replacement
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Solution Overview
Problem
Current top pot assemblies in well drilling require frequent replacement of rubber seals, leading to increased downtime and operational costs due to the need for specialized tools and complex replacement processes, especially under high-pressure and high-temperature conditions, which poses safety risks to rig personnel and inefficiencies in drilling operations.
Innovation Solution
A top pot assembly with a housing that secures the rubber to an inner barrel for rotation, utilizing a quick attachment system that simplifies the replacement of the rubber, reducing the number of steps and tools required, and incorporating a driving head that accepts a Kelly driver for efficient rotation and sealing of the drill string.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single rubber seal is used to seal against varying diameter drill string components, then the rubber must be rigid enough to withstand high pressure yet resilient enough to maintain seal contact, but this causes frequent wear and requires frequent replacement
Solution Approach 1:
The sealing system is divided into multiple rubber seals (first rubber seal and second rubber seal) positioned at different locations. Each rubber seal is optimized for specific sealing requirements, allowing them to share the sealing load and reduce individual wear, thereby extending overall service life while maintaining reliable sealing.
Solution Approach 2:
The patent employs rubbers with different durometer hardness values (e.g., 60-80 durometer for first rubber seal, 40-60 durometer for second rubber seal). This parameter variation allows softer rubbers to conform to varying drill string diameters while harder rubbers provide structural support and pressure resistance, extending service life without compromising sealing reliability.
2Reliability
If specialized tools and complex replacement processes are used for rubber seal replacement, then sealing reliability is maintained, but downtime and operational costs increase
Solution Approach 1:
The sealing system is divided into multiple rubber seals positioned at different locations. This segmentation allows for selective replacement of individual seals rather than requiring complete disassembly and replacement of the entire sealing system, reducing downtime while maintaining overall sealing reliability through the remaining functional seals.
Solution Approach 2:
The multiple rubber seals are pre-positioned and pre-configured within the assembly. This preliminary arrangement ensures that sealing capability is maintained throughout the replacement process, as remaining seals continue to provide sealing function while one or more seals are being replaced, thereby minimizing downtime.
3Reliability
If heavy tools are used to connect stripper rubber assembly to drilling head under high pressure, then fluid-tight seal is achieved, but safety risks to rig personnel increase from scalding and burns
Solution Approach 1:
The sealing system is divided into multiple rubber seals positioned at different locations. This segmentation distributes the sealing function across multiple components, allowing for staged connection and sealing. The first rubber seal can establish initial sealing while the second rubber seal provides additional sealing, enabling safer, more controlled connection procedures that reduce exposure to high-pressure fluids.
Solution Approach 2:
The multiple rubber seals provide redundant sealing capability that cushions against potential sealing failures. This preliminary protective measure ensures that even if one seal fails or leaks during connection, the other seal maintains the fluid-tight barrier, protecting personnel from scalding and burns while achieving reliable sealing.
4Adaptability or versatility
If the rubber is sized to seal against the smallest diameter component, then sealing contact is maintained, but the rubber cannot accommodate larger diameter components like drill collars
Solution Approach 1:
The sealing system is divided into multiple rubber seals positioned at different locations along the assembly. Each rubber seal can be independently sized and configured for specific diameter ranges. This segmentation allows the first rubber seal to accommodate smaller diameter components while the second rubber seal accommodates larger diameter components like drill collars, maintaining both adaptability and sealing reliability across varying diameters.
Solution Approach 2:
Different rubber seals are positioned at different locations with different dimensional characteristics. The first rubber seal may have different hardness and diameter specifications optimized for smaller components, while the second rubber seal has specifications optimized for larger components. This local quality variation enables the system to adapt to varying drill string diameters while maintaining reliable sealing at each location.
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 reduces downtime and operational costs by simplifying the replacement process, enhancing safety, and maintaining a fluid-tight seal across varying drill string diameters, thereby increasing the efficiency and longevity of drilling operations while minimizing debris entry into the well bore.
Implementation Method 1
the rubber needed to be rigid enough to withstand the pressures of the drilling fluid yet resilient enough to maintain a seal on the drill collars as the drill collars passed through the drilling head and thereafter return to the original configuration to seal against the smaller diameter drill pipe
Data Source
AI summary
The present invention relates to rotating heads for oil and gas wells and more particularly, to an improved top pot assembly that utilizes an attachment body for attaching the rubber and the driving head to a bearing assembly for rotation with the inner barrel. The attachment body simplifies the replacement of the rubber on the drilling assembly. The attachment body of the present invention provides a driving receiver for attachment of the driving head to the attachment body. The attachment body of the present invention also provides a stripper receiver for attachment of the rubber to the attachment body. The attachment body attaches to the housing. The housing attaches to the bearing assembly for rotation of the driving head, the rubber, and the inner barrel.