Fujian, China
Business Type:
Main Markets:
South America, Europe, Southeast Asia/ Mideast
Terms of Payment:
LC, T/T, Western Union
OEM/ODM Service
Sample Available
French / Russian / Spanish Speaker

Casing System, Casing Systems, Overburden System manufacturer / supplier in China, offering Symmetric/Symmetrix Overburden Drilling Casing System, DTH Hammer Top Sub Detach Dismantle Workbench, Water Bag for Block Stone and so on.

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Symmetric/Symmetrix Overburden Drilling Casing System

Get Latest Price
Min. Order / Reference FOB Price
1 Set US $600-3,500/ Set
Port: Xiamen, China
Production Capacity: 20000sets/Month
Payment Terms: L/C, T/T, Western Union, Money Gram
Customized: Customized
Certification: API
Length: Jobber-length
Type: Center Drill Bit
Material: Tungsten Carbide
Usage: Well Drilling

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Basic Info

Model NO.: HSOD114
Suitable Hammer Model: 3"-18" Hammer
Reamed Diameter: 118mm-426mm
Trademark: BESTLINK
Transport Package: Wooden Box
Specification: CE
Origin: Xiamen, China
HS Code: 84314320

Product Description

Concentric/symmetric overburden system
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 
first class special alloy steel with high strength, heat resistance and wearable
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 typeCasing ODCasing wall max.Ring bit IDRing bit ODPilot bit ODHammer


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