Concentric Overburden DrilingSystem (High Air Pressure)

Type	Hole Diameter (mm)	NO. Air Hole	Gauge Buttons	Front Buttons	Casing Size ( Wall Thickness * Outerdiameter)	Size (Diameter*L)	Weight (KG)	Hole deep(m) (f=4~6)	Match DTH Hammer
DR146	Φ156	3	Φ14*6	Φ14*5	Φ146(5~7.5)	Φ129X405	24	300~1000	DR340
DR168	Φ182	3	Φ14*6	Φ14*6	Φ168(5~10)	Φ146X550	30	300~1000	DR350
DR183	Φ196	3	Φ14*8	Φ14*8	Φ183(5~10.5)	Φ161X688	38	300~1000	DR350/360

Working Principles:
A. When drilling, the reamer swings out and drills a hole largerthan the externa diameter of the casing tube.
B. When the required depth has been reached, the drill is reversedand the reamer swings in to its minimum diameter, allowing the bitto be lifted up through the casing, which is left in the hole.
C. Drilling can continue with an ordinary DTH drill bit.

HREE reamer wings advantages:
1. multi-orientation simultaneously crush, so as to bear stressevenly and subsequently impact resistance.
2. dislaging easily
3. Drilling rod and casing could accelerate following up.
4. Operation, aseemble and unassembled the equipment is easy.
5. Multi-axis suspension is adopted, to avoid reamer from fallingof.

Related Keywords: concentric overburdendrilling , drilling system , drillingtools , Concentric Overburden DrilingSystem

Contact Infomation

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Company name:Chengdu Drillrocker Inc.
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Business contact:Jack (Ms.)
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Area: Caribbean Region-Bermuda

Address:No.2,Yuhong Hongye road, Qingbaijiang District ,Chengdu
Zip:610306