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.

 

NOD240 Eccentric Overburden Drilling Equipment

 

	1	Casing Tube	Maximum O.D.: 273mm Minimum O.D.: 260.4mm
	2	Drill Pipe	Connection Thread: API3 1/2”Reg O.D.: 114mm Wrench Flats: 95mm
	3	Guide Sleeve	Effective length: 343mm
	4	DTH-Hammer	ND85, Cop84, NSD8, DHD380, NQL80
	5	Casing Shoe	L3=110mm L4=65mm D3=259mm D4=241mm
	6	Guide Device	L1=70mm L2=190mm D1=240mm D2=257mm
	7	Reamer	D5=238mm L5=100mm Reaming Diameter: 308mm Reamer has 16*16 buttons
	8	Pilot Bit	D6=240mm L6=89.5mm Gauge button: 12*18 Front button:32*16

 

Technical Data