American Varco company is the world's first top drive of the development company, has developed more than 10 kinds of specifications of the top drive. In recent years, the company will be the original products and the latest research results into 7 series, namely the increase of new developed TDS-8SA type and TDS-11SA type AC variable frequency electric drive top drive, cancel TDS-3 the original, TDS-3S type, TDS-5 type, TDS-7S type top drive, retention of IDS-1 type and TDS-4H type or TDS-4S type, TDS-6S type and TDS-9S type top drive. A new series of top drive API lifting load is 2500 ~ 7500kN, continuous working torque is 10.21 ~ 86.94kN.m, intermittent working torque is 18.47 ~ 129.72kN.m, the power at the maximum speed 120 ~ 500r/min, top drive system height of 4.7 to all 7.9m. products are used electric drive type, TDS-8SA type, TDS-9SA type, TDS-10SA type and TDS-11SA type top drive, using AC conversion electric drive type, AC motor and IDS-1 type, TDS-4H type; TDS-4S type and TDS-6S type top drive, used the AC-SCR-DC electric drive type, DC type and TDS-11SA type motor; TDS-9SA top drive with two AC motor, and the other 5 models, the use of the top drive motor 1. Onshore drilling operations to improve efficiency, to meet this need, since 1997. Varco drilling system drive drilling system according to the new drive technology development innovation on top of TDS-11SA.

Varco has designed the TDS-11SA top drive drilling system with two units (350 horsepower or 400 horsepower, depending on different needs), using the latest achievement of AC frequency conversion technology. At the top of the 700 horsepower and 800 horsepower drive drilling system can produce 32500 foot pounds of torque respectively? Drilling and 47000 foot pounds and 56000 foot pounds?? the buckle / break out torque.

The TDS-11SA is compact and can operate safely within a standard 142 foot derrick and can produce up to 500 tonnes of lifting force. TDS-11SA takes convenient design, and it takes only a few hours to install and disassemble. It is easy to install on the existing drilling rig, with low installation costs and only a very small change in the derrick.