Rotary Table is one of the important supporting equipments in oil drilling operations and is an important part of rotating and carrying drill strings.Its main fuctions are:
1.When normal drilling,it drive the drill tools to rotate;
2.When trip and casing running, it supports the weight of all drill string or casing string in the
well;
3.When breakout, unloading the drill bit and handing the accident, complete the auxiliary work
such as back-off and makeup;
4.When drilling with a bottom hole power drilling tool, it used to brake the upper drill string.
