What is the specific principle of top drive of oil drilling rig? How about a top drive? Is the cost high? Fuel consumption of 20,000 to 30,000 a day

The top drive is simply an electric faucet, driven by two motors next to the faucet. Compared with the electric turntable, the biggest advantage is that it has advantages when dealing with complexity. For example, anti-eye. In addition, it is faster to receive a single connection. What is cost, daily cost or the cost of buying top drive? If you buy a top drive, it will definitely be more expensive, especially the foreign ones are smaller and have fewer problems. The top drive is purchased in complete sets, except for the electric faucet, guide rail, a power distribution room and special cables. For daily consumption, you don't need a turntable when you use the top drive, and it's almost the same.