Common DTH Drilling Rig Types And Working Principle
The composite drilling rig
There are two kinds: one is a water well rig that combines impact as well as slewing, such as a spider-installed hydraulic DTH drilling rig. The down-the-hole hammer drill includes a cylindrical tube liner as well as a piston. High-pressure air is provided by the air compressor to press the piston backward and forwards to reciprocate, and also the drill little bit is struck to boost the drill little bit's capability to drill right into the rock formation. At the same time, the drill is turned at a reduced rate of 35 to 60 rpm. The air discharged from the top and also lower dental caries of the piston gets in the drill a little bit and also lugs the bottom cuttings out of the wellhead. The wind-driven down-the-hole hammer drill can be utilized for drilling deep wells in acid rock formations with high drilling speed and straight birthed holes.
The other is to add an impact mechanism on the basis of the rotating drilling equipment, which is mostly based on rotating drilling. When the cobble layer is experienced, the two water well drilling rigs drilled by impact have strong adaptability to various developments.
The impact drill
The vertical reciprocating activity of the drill creates a drill little bit to impact the bottom of the well to break the rock formation. The structure is basic, there is no flow washing system, as well as the elimination of cuttings as well as the drilling machine, can not be performed at the same time, so the performance is reduced. Drilling depth is normally within 250 meters, occasionally approximately 500-600 meters. There are 2 primary kinds:
1. Cord rope effect drill. It consists of a pole as well as a training sheave placed on the top, a cord rope, an impact device, a drill, and also an electrical motor. Throughout the procedure, the electric motor drives the effect mechanism through the transmission tool and drives the cable rope to reciprocate the drill device. When relocating downward, the weight of the drill bit is cut into and also fractured by the weight of the drill a little bit, and also the upward motion is pulled by the cable rope. The drill stroke is 0.5 to 1 meter and also the effect regularity is 30 to 60 times per min. The cuttings are gotten rid of from the ground by a sand pumping tube and drilled as well as eliminated concurrently.
2. Top hammer drill rig. Use the weight of the drill itself to impact the formation. The lower end of the drill is a number of sharp-angled flaps that can be folded up. When the drill relocates downward under its own weight, the flap opens up as well as cuts into the rock layer, and afterward, the drill is lifted by the winch through the cord rope, and also the flap is shut. During the procedure, the cuttings are captured in the cone, and the cuttings are released from the wellhead. The drilling depth is generally 40 to 50 meters, and also the deepest is 100 to 150 meters.
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