Casing Tube Max Outer Diameter Odex Drill Bits Eccentric Overburden Casing System for Deep Water Wells Drilling

Brief introduction of our dirlling system:

Drilling System consists of three parts:central pilot bit, casing shoe and symmetrical ring bit. The central pilot bit drills away the center part of the hole and guides the drill string, incorporated with a sacrificable symmetrical ring bit make a full face drill bit. The casing shoe is welded or threaded to a casing pipe, which is pulled down by the impact of the DTH hammer and central pilot bit. The symmetrical ring bit and casing shoe assembly is locked into central pilot bit with a hammer shank, and the ring bit is to drill the segment the casing to advance down the hole. The pilot bit's upper shoulder engages the shoulder of the casing shoe. DTH hammer's impact energy is transferred through the pilot and ring bits, crushing rock, part of impact energy advances casing. 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. Drilling continues to the desired depth in the bedrock using a conventional drilling.  

DTH bits specifications:

Picture of high air pressure DTH drill bit:


Picture of high air pressure DTH hammer:

 

Picture of our factory:
Changhong Mining Machinery Co., Ltd. we are direct factory and over 30 years of experience in producing mining & engineering machines,which is well informed with the product, technology and latest development in mining & engineering industry.

Our company mainly produce high, medium and low type of high air pressure DHT hammers and drill bits, 
concentric and eccentric drilling system, tunnel TBM cutter, various threaded drill bits and shank adapter, coupling sleeve, drill pipe and rock drilling accessories. All of our products are compatible with world famous brand products such as Atlas, Ingersoll Rand, Sandvik. They are widely used in construction sites of mining drilling, ground excavating, tunnel drivage, transportation, irrigation works and hydropower, water well, foundation treatment,exploration, applicable for rock drilling and cutting tools under various geological conditions.


How to Chose the Right Products :
Choosing the right hammer is determined by drill machines (mainly compressor output), drilling hole size and type of rock formation. Ideally, the size of the hammer should match the required hole dimension as closely as possible, leaving just enough space for compressed air to flush cuttings and clean the hole.
 
The optimum range of hole size for blast-hole drilling with DTH method is 90~254 mm (3-1/2"~ 10") with 3.5 ~ 8" hammers. Smaller blast holes are generally drilled with top-hammer tools, while larger holes typically with rotary drilling tools. In other applications, like foundation drilling, DTH hammers can be used in hole size up to 1,000 mm (39-3/8").
 
Usually, the smallest hole diameter a DTH hammer can drill is its nominal size, for example, a 4"hammer would drill a 4" (100/102 mm) hole. The limiting factor is the outside diameter of the hammer, because, as hole diameter reduces, airflow is restricted. Maximum hole size for production drilling is the nominal hammer size plus 1"for 5" and smaller hammers and plus 2 for 6" and bigger hammers, for example, for a 4" hammer the maximum hole size is 5" (127/130mm) while for a 8"hammer the maximum hole size is 10" (254mm).  
 

Advantages:

1. Deliver maximum energy to drilling bit, fast drilling speed and low air consumption due to the special inner structure of HD series DTH hammer designed according to newest rock drilling theory.

2. Smooth performance and long service life of HD series DTH hammer due to high quality alloy steel materials and advanced processing technology adapted.

3. Low problem rate and easy to maintenance due to simple, reliable and easy assemble and disassemble inner structure of hammer.

4. Easy to depart bit from hammer due to multi-head thread connecting chuck and cylinder of hammer.

5. Interchangeable with DTH bit and drill pipe.

FAQ:
1.Are you a manufacturer or a trade company?
We are a manufacturer of rock drilling tools and tungsten carbide products in China over 16 years.

2.Where is your company?
We are located in Chinese largest production base of tungsten carbide, Zhuzhou city, Hunan province. Half  an hour by car from Changsha airport, two and a half hours by CHR express from Guangzhou station to Zhuzhou city.

3.Why choose Chdrill?
1)We have more than 30years of researching, developing, manufacturing  and exporting high quality rock drilling tools and tungsten carbide products to the global market.
2)High quality.
3)Competitive price.
4)Excellent customer service.

4.Which port do you shipping from?
We usually ship container from Shanghai port and Shenzhen, Guangzhou port are available too.

5.What is your minimum order quantity?
Our MOQ are 1pc or 1 set, the price may rely on the order quantity.

6.What is your payment term?
We accept T/T, L/C at sight, West union and PayPal.

7. How about the delivery time?
For general products, we have in stocks. 
For others, it depends on the quantity, generally it takes about 15-25workdays.

8. Can I visit your factory?
Warmly welcome to our factory. We will pick you up at Changsha air port or Zhuzhou West Station or Zhuzhou station.

For more low and high air pressure DTH drill bit, please contact our customer service: