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.

NOD115 Eccentric Overburden Drilling Equipment

	1	Casing Tube	Maximum O.D.: 142mm Minimum I.D.: 128mm
	2	Drill Pipe	Connection Thread: API2 3/8”Reg O.D.: 76mm Wrench Flats: 65mm
	3	Guide Sleeve	Effective length: 174mm
	4	DTH-Hammer	HD45, Cop44, SD4, DHD340A, QL40, HM4
	5	Casing Shoe	L3=76mm L4=55mm D3=127.5mm D4=117mm
	6	Guide Device	L1=48mm L2=136mm D1=115mm D2=126mm
	7	Reamer	D5=114mm L5=89mm Reaming Diameter: 152mm Reamer has 5*14mm buttons
	8	Pilot Bit	D6=114mm L6=67mm Gauge button: 8*14mm Face button:6*13mm

Technical Data

eccenetric overburden rock air drilling tools