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.

NOD90 Eccentric Overburden Drilling Equipment

	1	CasingTube	MaximumO.D.: 115mm MinimumI.D.: 102mm
	2	DrillPipe	ConnectionThread: API2 3/8”Reg O.D.:76mm WrenchFlats: 65mm
	3	GuideSleeve	Effectivelength: 174mm
	4	DTH-Hammer	HD35,Cop32, IR3.5, QL30
	5	CasingShoe	L3=90mmL4=55mm D3=101mm D4=93mm
	6	GuideDevice	L1=35mmL2=138mm D1=92mm D2=100mm
	7	Reamer	D5=91mmL5=70mm ReamingDiameter: 123mm Reamerhas 4*12mm buttons
	8	PilotBit	D6=90mmL6=59mm Gaugebutton: 8*12mm Facebutton:6*10mm

Technical Data