eccenetric overburden rock air drilling tools

overburden drilling 1.efficient energy transfer 2.faster drilling speed 3.lower oil consumption 4.longer life,less failure

eccentric overburden drilling equipment:

1. 10 years manufacturing experience;

2. Certificate: ISO9001:2008

3. Material: Carbide

Eccentric Reamer System Step-by-step

1. When drilling starts, the reamer swings out and reams the pilot-hole wide enough for the casing tube to slide down behind the drill bit assembly.

2. When the required depth is reached, rotation is reversed carefully, whereupon the reamer swings in , allowing the drill bit assembly to be pulled up through the casing.

3. Casing tubes that are to be left in the drill hole should be sealed at the bottom of the hole by means of cement grout or some other sealing agent.

4. Drilling continues to the desired depth in the bedrock using a conventional drillstring.

NOD280 Eccentric Overburden Drilling Equipment

	1	Casing Tube	Maximum O.D.: 324mm Minimum I.D.: 305mm
	2	Drill Pipe	Connection Thread: API4 1/2”Reg O.D.: 114mm Wrench Flats: 95mm
	3	Guide Sleeve	Effective length: 305mm
	4	DTH-Hammer	SD10, NUMA100
	5	Casing Shoe	L3=125mm L4=75mm D3=304mm D4=281mm
	6	Guide Device	L1=97mm L2=254mm D1=280mm D2=303mm
	7	Reamer	D5=266mm L5=120mm Reaming Diameter: 378mm Reamer has 22*18mm buttons
	8	Pilot Bit	D6=280mm L6=135mm Gauge button: 12*18mm Face button:27*16mm

Technical Data

eccenetric overburden rock air drilling tools