2021 Symmetric Overburnden Casing Drilling Systems DTH Drill Bits Rock Drilling Tool

• Customized: Customized
• Standard: API
• Length: Jobber-length
• Shipping Cost: Estimated freight per unit.: about shipping cost and estimated delivery time.
• Currency: US$
• Return&refunds: You can apply for a refund up to 30 days after receipt of the products.
• Model NO.: 140mm Symmetric overburnden drilling system
• Type: Center Drill Bit
• Material: Tungsten Carbide
• Usage: Well Drilling, Masonry Drilling
• Application Range: Water Well Drilling, Geothermal Wells, etc...
• Ring Bit Diameter: 124-637mm
• Suitable Hammer Model: 3" to 18" Hammer
• Casing Od: 114-610mm
• Transport Package: Carton
• Specification: depends on quantity
• Trademark: BESTLINK
• Origin: Fujian, China
• HS Code: 84314320
• Production Capacity: 20000 PCS Per Month
• Package Size: 50.00cm * 50.00cm * 50.00cm
• Package Gross Weight: 50.000kg

Product Description

2021 Symmetric Overburnden Casing Drilling Systems DTH Drill Bits Rock Drilling Tool

In the projects of drilling,drillers often meet with problems due to the loose land formation.These may cause troubles such as difficulty in drilling down,collapse of holes,damage of drilling tools,etc.To solve the problems,the best way is to use (ODEX)Overburden Drilling System which can prevent holes and drilling tools from damage,and support the holes by casing tubes.



General Introduction 
1.drill in overburden unstable rock 
2.one step to drill and follow casing 
3.flexible to open or close 
4.effecient below 300mm 
 
Design Principles:
Make the casing follow easy and the equipment and operation simple 
Outstanding Advantages 
Simple structure,simple operation,reliable quality,retrievable drilling tools,long service life.
 
Raw Material 
Steel:
first class special alloy steel with high strength, heat resistance and wearable
Carbide
The best tungsten carbides from China are commonly applied.
Tungsten carbide from European is also available.

Working Process:
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. On completion of drilling and casing, the drill string with pilot bit is retrived 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.
3. Hammer's percussive energy is transferred through the pilot and ring bits, crushing rock. Part of impact energy advances casing.
4. Drilling continues to the desired depth in the bedrock using a convertional drilling.
 

Product type	Casing OD	Casing wall max.	Ring bit ID	Ring bit OD	Pilot bit OD	Hammer
SOD114	114.3	6/10	91/78	128/124	100/92.5	HD35
SOD127	126.7	7	99	140	110	HD35
SOD140	139.7	7/10	116/94	154/150	124/117.5	HD45,HQL4
SOD168	168.3	8/12.7	142/121	182/178	150/140	HD55,HQL5
SOD178	178.3	10	145	195	156	HD55,HQL5
SOD194	193.7	6/12.7	167/148	212/203	180/167	HD65,HQL6
SOD219	219.1	7/12.7	186/167	234	203/191	HD65,HQL6
SOD273	273	8/12.7	232/219	292	255/246	HD85,HQL8
SOD325	323.9	8/12.7	281/270	342/342	306/297	HD85,HSD8
SOD406	406.4	12.7	328	419	374	HSD10,HN125
SOD508	508	15	412	526	470	HD475,SD15
SOD609	609.6	15	513	637	570	HD525,SD18