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DTH Hammer

The down-the-hole hammer drill is a pneumatically operated bottom-hole drill that efficiently combines the hitting action, similar to that of cable tool drilling, with the turning action of rotary drilling. The pneumatic drill can be used on any standard rotary rig with an integral or auxiliary air compressor of sufficient capacity. It is used for fast and economical drilling of medium to extremely hard formations. Fast penetration results from the air piston blows transmitted directly to the bit, so practically no energy is wasted in chewing up cuttings. A straight hole is assured by short, rapid blows that minimize the effect of dipping and broken formations. Down-the-hole hammer drilling is by far the fastest method of penetration in hard rock material. The bit is turned slowly (10 to 15 RPM) by the same method that rotates the drill bit in the mud or air drilling operation.

Hydraulic Drifter

This drilling method is top head percussion. It is used for fast and economical drilling of small size hole (less than 4”) and shallow water well. Also, the method is very useful for casing treatment.
As air compressor is not needed under this method, the method can save the maintenance & working cost and the operation is so simple.

DTH Hammer with Casing (Hyd. Drifter)

This method can be achieved DTH drilling & Casing treatment as same time.
DTH Hammer and Hyd. Drifter is working at same time.
Hole drilling has done by DTH hammer and Casing treatment has done by Hyd. Drifter.
This is new technology of Hanjin.

DTH Hammer with Casing (Overburden System)

The methods of drilling with casing treatment at same time are two typical method. One is overburden system and the other is Dual Rotation System.
This method is using overburden bit, odex bit or tubex bit and so on. The kinds of bit is just different the design. However, they achieve same result.

Rotary Drilling with Mud

In the rotary method of drilling, action is accomplished by rotating a drill pipe by means of a power driven rotary table or hydraulic powered top head drive, with a bit attached to the bottom of the pipe. The bit cuts and breaks up the material as it penetrates the formation. Drilling fluid for mud is pumped through the rotating drill pipe and through holes in the bit. This fluid swirls in the bottom of the hole picking up material broken by the bit, then flows upward in the space outside the drill pipe, carrying the cuttings to the ground surface and clearing the hole. The greater the fluid flow the faster the drilling. The drill pipe and bit move downward deepening the hole as the operation proceeds. At the surface, drilling mud flows into a ditch to a settling pit where the cuttings settle to the bottom. From the settling pit the fluid overflows into another pit from which it is picked up through the suction hose of the mud pump and re - circulated through the drill pipe. In the rotary drilling method the casing pipe is not introduced until after the drilling operations are completed. The walls of the hole are held in place by the pressure of the mud pump against the sides of the hole.

Rotary Drilling with Air

Air drilling is basically the same as mud drilling except that the mud pump is replaced by a compressor assembly including cooling system, air receiver and unloading system. The air line is connected to the swivel hose at the top of the top head drive. The air is forced down through the drilling pipe and out through the holes at the bottom of the rotary drill bit. A small stream of water is often introduced into the air system to help cool the drill bit and control dust. The air serves to cool the drill bit and force cutting up out of the hole and is collected at the top. Air is used principally in hard clay or rock formations, in as much as once the air pressure is turned off, loose cavy formations would cave-in against the drill pipe. This is not the case when mud is used.