High Quality Symmetric Overburden Casing Drilling System with Ring Bits and Pilot Bit

• Material: Carbon Steel
• Type: Retrievable / DTH, Drill Bit
• Machine Type: Drilling Equipment
• Processing Type: Forging
• Use: Well Drilling
• Transport Package: Wood Package
• Specification: SGS, CE, ISO9001
• Trademark: prodrill
• Origin: China
• HS Code: 84314320
• Production Capacity: 10000pec/Months

Product Description

Symmetric Overburden Casing Drilling System With Ring Bits and pilot bit

The Prodrill symmetric drilling system is designed to drill and case a hole simultaneously through unstabled ground conditions. The driver bit incorporated with a satisficial ring or reusable ring makes a full face head design which significantly improves the penetration rate and hole straightness of drilling. The internal flushing grooves together with the built-in casing shoes gives a good seal to the button of the drilling hole, and thus minimising the disruption of the surronding of the drill hole. 


Application Range: It is suitable for drilling water wells , geothermal wells , short mircopiles ,medium mini-type grouting hole of building , dam and harbour project . 
1. Ring bit and casing shoe assembly is welded to casing prior to drilling. Lock the assembly into pilot bit with hammer. The pilot bit's upper shoulder engages the shoulder of the casing shoe. 
2. Hammer's percussive energy is transferred through the pilot and ring bits, crushing rock . Part of impact energy advances casing. 
3. On completion of drilling and casing , the drill string with pilot bit is retrieved by a slight reverse rotation to unlock the bayonet coupling . The ring bit stays in the hole , and can be recovered only if the casing is retrieved 
4. Drilling continues to the desired depth in the bedrock using a conventional drilling.

Advantages: 
Full face head desigh for faster penetration and straighter hole 
Less torque is required 
Can drilll in vertical, horizotal or any direction 
Minimize disruption to the drilled hole 

Other Models

RoBit Size Permanent/Top hammer  Symmetrix overburden drilling system
Code No.	Casing O.D.		Wall thickness		Ring bit I.D.		Ring bit O.D.		Polit bit O.D.		Thread
	mm	inch	mm	inch	mm	inch	mm	inch	mm	inch
RoBit-SOD 89	89	3 1/2''	4	0.157	71	2.795	99	3.898	80	3.15	T38
RoBit-SOD 76	76	3''	8	0.315	47	1.85	90	3.543	59	2.323	T38
RoBit-SOD 89	89	3 1/2''	8	0.315	50.8	2	94.9	3.736	70	2.756	T38
RoBit-SOD 101	101.6	4''	10	0.394	65	2.559	110	4.331	79	3.11	T38
RoBit-SOD 114	114	4 1/2''	10	0.394	73.5	2.894	120.3	4.736	92.5	3.642	T38
RoBit-SOD 140	140	5 1/2''	10	0.394	94	3.701	145.7	5.736	117.5	4.626	T45
RoBit-SOD 168	168	6 5/8''	10	0.394	127	5	182.3	7.177	147	5.787	T45

SOD Permanent/Top hammer Symmetrix overburden drilling system
Order number	Casing wall  max. thickness		Ring bit		Pilot bit		Unit
			Inner	Outer	Outer
ATLAS-SOD 76	8		41	88	58		mm
	0.31		1.61	3.46	2.26		inch
ATLAS-SOD 89	8		54	100	70		mm
	0.31		2.13	3.94	2.76		inch

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