Description
Introduction to Top Drive Inner Barrel/Sleeve Bushing
The sleeve is usually used with an internal component, which is usually called a sleeve or sleeve bushing. Different manufacturers may have different terms, but its core functions include:
Top Drive Inner Barrel/Sleeve Bushing Function
1. Connection and Sealing
Connects to the drill string through threads or clamps.
Seals (metal or rubber) prevent mud leakage into the top drive.
2. Torque Transmission Support
Use splines or keyways to enhance torsional resistance and prevent slippage.
3. Shock Absorption
Absorb vibration and shock loads to protect the sleeve and top drive structure.
4. Modular Design
Designed for rapid replacement on site to minimize downtime.
Top Drive Inner Barrel/Sleeve Bushing Terminology Changes
Sleeve: General term (used by NOV, Canrig, etc.).
Gooseneck Bushing: Emphasizes the role of its bushing (e.g. Tesco).
Gooseneck adapter: Used when integrated with gooseneck mud flow path.
Top Drive Inner Barrel/sleeve bushing practical considerations
Top Drive Inner Barrel/sleeve bushing compatibility:
Must match top drive model, drill pipe size (e.g. 5½-inch, 6⅝-inch), and thread standard (API, IF).
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