Oil well drilling rigs with a rotary table component, Kelly drive bushing, and 45 ft of Kelly were the industry standard for years. TOP DRIVE is a drilling rig equipment that has been one of the better innovations in the oil field in the last few years. The top drive system has three main functions:

Perform all normal hoisting requirements

Rotate the drill string

Enable circulation through the drill string

Most rigs today are equipped with the top drive.

Advantages:

Possibility to drill stands of drill pipe rather than single

Ability to back-ream while pooh

Contains remote-controlled Inside BOP, that can be operated at distance from the rig floor

Manufacture specifications

Top Drive is built in accordance with API Spec. 8A and 8C.