Kelly bushings

Rotary equipment refers to the pieces of surface equipment in drilling operations that actually rotate or impart rotating motion to the drill pipe. This equipment includes the upper members of the drill string such as the swivel, swivel sub kelly cock, kelly, lower kelly valve, and kelly sub (Figure 4-87), as well as the kelly bushing and rotatary table [13]. 

The rotary table (Figure 4-95) provides the rotary movement to the kelly. The master bushing of the rotary table encases the kelly bushing or pipe slips, as... 

The kelly bushing attaches the kelly to the rotary table. It locks into the master bushing and transfers the torque produced by the table to the kelly. There are two types of kelly bushings [16] ... 

Square drive kelly bushings (aligned with square drive master bushings)... 

Rotary table rotates, along with its constituent parts, the kelly and kelly bushing, the drill string, and the attached tools and bit. 

Kelly A strong four- or six-sided steel pipe that is located at the top of the drill string it runs through the kelly bushing. 

Swivel and Rotary Hose 616. Drill-Stem Subs 619. Kelly 620. Rotary Table and Bushings 622. 

The life of the drive section as related to the fit with kelly drive bushings is generally greater when the square drive section is used. However, the use of adjustable drive bushings (adjustable bushings with wear) can drastically increase the life of the square drive section. 

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