Matters needing attention in construction of DTH drill bits
Matters needing attention in construction of DTH drill bits
1. When working in different rock formations, choose different types of down-the-hole drill bits, axial pressure and rotational speed according to the hardness of the lithology.
2. During the perforation operation of the down-the-hole drilling rig, the operation must be carried out in accordance with the principle of matching the three elements of perforation (wind pressure, axial pressure, rotational speed) and the parameters recommended by the drill bit sample.
3. Before the drill bit goes down the well, please check the appearance of all parts, and verify whether the end face of the drill bit thread is consistent with the factory number on the drill bit packing box and certificate to prevent counterfeiting.
4. The drill bit should be reasonably stored on the DTH drilling rig to prevent dust and other debris from entering the drill bit.
5. When replacing the DTH drill bit, make sure that there is no dust inside the drill tool, the air outlet is unobstructed, the thread is oiled, and the drill bit can be used after connecting the drill bit by means of lifting and rotating.
6. Before replacing the new drill bit, carefully check whether the three cones rotate flexibly, and whether the thread and teeth are in good condition.
7. When the new drill bit is drilled, it should be run at low axial pressure and low speed for 20-30 minutes, and then gradually increase to normal axial pressure for use.
8. When opening a new hole with a new DTH drill, pay attention to removing the debris around the hole (rocks, scrap metal, etc.), and at the same time of rotation, ventilate slowly and close to the surface to prevent drilling and impact damage to the drill.
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