Rotary drilling is currently the most commonly used drilling method, divided into two methods: positive circulation drilling and reverse circulation drilling.
The rotary drilling method is to drive the drilling tool to rotate through the rotary mechanism. The drill bit installed at the end of the drilling tool cuts the soil or grinds the rock for drilling. The flushing medium (water, drilling flushing fluid) is injected into the drill at a certain flow rate and pressure by a high-pressure water pump. Tool to drain the muck from the hole to form a hole.
According to the power transmission mode, rotary water well drilling rigs can be divided into power head, rotary drilling and down the hole power drilling.
Power head water well drilling rigs use hydraulic pressure from the top to provide power to drive the rotating rod to drive the drill bit to break the rock.
The rotary table drilling rig is equipped with a rotary table at the wellhead of the drill floor. The central part of the rotary table has a square hole. The kelly at the upper end of the drill string passes through the square hole. The drill bit rotates together to achieve the purpose of breaking the rock.
The down the hole power drilling machine uses the down the hole power drilling tool to drive the drill bit to break the rock. The drill string does not rotate during drilling, so the equipment is less worn and has a long service life. It is especially suitable for directional drilling. It is divided into turbo drills, screw drills and Electric drill and other forms.
