The requirements for the rotary drilling rig are as follows:
1. It needs to drill wells with a diameter of 900 millimeters (90 centimeters) in limestone, with a depth of 12 meters. The soil is of karst topography, with an average strength ranging from 20 MPa to 80 MPa.
2. The composition is 80% rock and 20% soil, meaning it is almost entirely rock.
3. Special drill bits are required due to the geological conditions and the 10-meter depth. It is recommended to use tricone drill bits and PDC drill bits.