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.

NOD190 Eccentric Overburden Drilling Equipment

	1	Casing Tube	Maximum O.D.: 222mm Minimum I.D.: 205mm
	2	Drill Pipe	Connection Thread: API3 1/2”Reg O.D.: 114mm Wrench Flats: 95mm
	3	Guide Sleeve	Effective length: 285mm
	4	DTH-Hammer	HD65, Cop64, SD6, DHD360, QL60
	5	Casing Shoe	L3=110mm L4=70mm D3=204.5mm D4=193mm
	6	Guide Device	L1=62.5mm L2=184.5mm D1=191mm D2=203mm
	7	Reamer	D5=185.5mm L5=90.2mm Reaming Diameter: 237mm Reamer has 7*16mm buttons
	8	Pilot Bit	D6=190mm L6=82mm Gauge button: 9*18mm Face button:9*16mm

Technical Data