Sealed Grease Head and Top Drive Guide for RCD Height Reduction
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Solution Overview
Problem
The existing rotating control devices (RCDs) in drilling operations face challenges due to the increased height caused by the kelly drive, limiting overhead space for rig personnel, and exposing the inner barrel to damage when the kelly drive is removed. Additionally, the current grease management systems are inefficient, leading to grease leakage and reduced bearing life.
Innovation Solution
The introduction of a top drive guide that eliminates the need for a kelly drive, reducing the overall height of the RCD and protecting the inner barrel, combined with a sealed grease head that provides separate compartments for lubrication, ensuring adequate grease supply to bearings and seals, and a new casing stripper rubber design that reduces manufacturing costs and improves operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a kelly drive is attached above the RCD to rotate the inner barrel with the drill string, then the rotation function is achieved, but the height of the RCD increases and overhead space for rig personnel is limited
Solution Approach 1:
The patent removes the kelly drive from the system entirely and replaces it with a top drive guide that guides the drill string through the inner barrel. The top drive guide is a simple structural component that does not require the complex kelly drive mechanism, thereby reducing the height of the RCD and providing more overhead space for rig personnel while still achieving the necessary rotation function through direct engagement of the drill string with the inner barrel.
2Length of stationary object
If the kelly drive is removed to reduce RCD height and provide more workspace, then overhead space increases, but the inner barrel is exposed to potential damage
Solution Approach 1:
The top drive guide serves as an intermediary component that protects the inner barrel from damage. It is a structural guide that directs and supports the drill string as it passes through the inner barrel, preventing accidental contact or damage to the inner barrel while still allowing the necessary rotational movement. This intermediary structure enables the removal of the kelly drive without compromising the protection of the inner barrel.
3Duration of action of stationary object
If a traditional grease management system is used, then grease is applied to bearings, but grease leakage occurs and bearing life is reduced
Solution Approach 1:
The grease management system is segmented into separate, isolated compartments within the RCD. Each compartment is designed to contain and distribute grease to specific bearing locations without mixing with other systems. This segmentation prevents grease leakage by containing it within defined boundaries and ensures proper lubrication distribution to extend bearing life while eliminating the harmful effect of grease leakage.
Data Source
AI summary
The sealed grease head provides a grease compartment with no oiler or oil lines. The grease compartment is sealed by a top seal and a bottom seal that seals between the inner barrel and the outer barrel. The sealed grease head provides a bottom seal that seals the grease compartment. A rubber adapter secures the seal while also securing the rubber to the inner barrel.