Specifications

Overburden Drilling
1.Efficient energy transfer
2.Faster drilling speed
3.Lower oil consumption
4.Longer life,less fail

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.

 

NOD165 Eccentric Overburden Drilling Equipment

 

	1	Casing Tube	Maximum O.D.: 195mm Minimum O.D.: 182.6mm
	2	Drill Pipe	Connection Thread: API3 1/2”Reg O.D.: 114mm Wrench Flats: 95mm
	3	Guide Sleeve	Effective length: 225mm
	4	DTH-Hammer	ND65, Cop64, NSD6, DHD360, NQL60
	5	Casing Shoe	L3=95mm L4=55mm D3=181.5mm D4=166mm
	6	Guide Device	L1=61.5mm L2=181.5mm D1=165mm D2=178mm
	7	Reamer	D5=164mm L5=79.5mm Reaming Diameter: 211mm Reamer has 7*14 buttons
	8	Pilot Bit	D6=165.8mm L6=82.5mm Gauge button: 8*16 Front button:8*16

Technical Data