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Contact: Dr.Robert Roschen

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Hole Opener

Hole Opener Hole Opener Corporation (HOC) offers specialized drilling equipment for underreaming, hole opening, and well abandonment - both domestically and internationally, as well as logistical and operational services including: pre-well planning, proper tool selection and adaptation of...

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Hole Opener  
Hole Opener Corporation (HOC) offers specialized drilling equipment for underreaming, hole opening, and well abandonment - both domestically and internationally, as well as logistical and operational services including: pre-well planning, proper tool selection and adaptation of equipment to specific parameters and conditions. HOC is also able to manufacture new security type hole openers and new and existing security compatible parts. Research, development and manufacturing, ranging from initial design and drafting to finished tool production and testing, are performed at HOC's manufacturing facility in Texas. 


Hole Opener 101
At some point it may be necessary to increase the size of a pre-drilled hole to a larger diameter or to drill large diameter holes. Hole opener bits are designed specifically for this purpose. Bits are custom manufactured in a wide range of styles to meet field requirements. A custom hole opener is an effective way of enlarging holes, hence the name "Hole Opener".


Endless Variations
There are many variations, all of which are tailored to the driller's specific needs. Hole openers can be fabricated with steel tooth cutters, tungsten carbide insert cutters or for DTH hammers, all either new or rebuilt. Bearing may be open or sealed and the hole opener may utilize either standard or reverse circulation. Hole openers may be the answer to your hole enlargement problems.


Cutter Configurations
TCI(Tungsten Carbide Inserts) Cutters are available along with diamond enhanced features. Fixed cutter hole openers are made from sections of tricone bits as shown left (TCI cutters) and below (Tooth cutters). Steel Tooth Cutters are available with carbide tipping.
Today, drillers are more adept at replacing their own cutters. Your supplier can provide the replacement cutters which saves you shipping the hole opener to and from the manufacturer for repair.


The Hole Opener Advantage
1.Straighter Holes - By drilling a smaller hole with a "pilot" bit, then attaching that said bit onto the bottom of the the hole opener. The hole opener will follow the path of the hole drilled by the smaller bit.
2.Larger Holes with Smaller Rigs - By drilling a hole in stages, larger holes can be drilled with smaller rigs. A smaller hole requires less power.
3.Replacing Cutters and Cutting Cost - On most Hole Opener designs, the cutters can be easily replaced. The cost to replace a cutter is a fraction of the cost to replace a large tricone rock bit.
4.Cost of Large Rock Bits - Larger diameter rock bits not only cost a lot, they can be difficult to find. A more economic solution is to use a hole opener that uses smaller tricone rock bit segments..
5. Flexability - Hole Openers can be fabricated in just about any size, and can be configured to drill through any formation.
Operational Considerations
1.Drilling Weight - The choice of drilling weight is determined based on the recommendations of the bit manufacturer and the number of cutters on the hole opener.
2.Number of Cutters - The number of cutters placed on a hole opener is governed by the following facts: 
1. Maximum number which will fit around the perimeter.
2. The greater the number of cutters, the less the weight, which therefore reduces the penetration rate.
3. In softer formations, less weight is needed to penetrate.
4. The greater the number of cutters, the smoother the tool will run.
5. The greater the number of cutters, the greater the cost.
6. The greater the number of cutters, the longer the cutters will last
3.Rotary Speed - Maximum speed is determined by the manufacturer's recommendation and the calculation to account for the linear distance the cutter is moving per revolution.
4.Hole Cleaning - A frequently over looked point of hole opener operation is hole cleaning. The volume of cuttings to remove from a hole increase by a squared factor with an increase in hole diameter.
DTH hole openers provide hole enlargement for hammer drilling. Custom pilot and head diameters are available in most all shank designs.
Shown right is an example of a 2-stage hole opener with a pilot bit. The pilot hole was drilled followed by the first stage to enlarge the hole. The second and final stage then further enlarged the hole to 54". Different stages can be built per drillers specifications to maximize cutting removal and rig capabilities.
To the left is a mammoth 66" fixed cutter hole opener with a 4" bore and flanged for reverse circulation.


Hole opener: 
1. Mainly consists of four or more cones
2. Suitable for different complexes formation
3. The pilot is tricone bit
Cone bit, reamer bit, hole opener bit, bigger diameter bit. 
1. Cutting Structure
The reamer mainly consists of four or more cones. Cutting Structure with premium tungsten carbide hardfacing or premium tungsten carbide insert of formulas and new techniques is utilized, and increases wear-resistance capability of reamer. The pilot is three cone bit( tricone bit ). 
2. Seal and Lubrication
High performance HNBR O-ring for bearing seal and advanced grease for lubrication. 
3. Product Application
It is suitable for the large size well, mining and infrastructure applications. 
Drill bit introduce
1. Drill bit cutting structure
Adopting new formula of new technology of the high quality hard alloy tooth, enhance the cutting teeth mechanical properties. 
2. Drill bit diameter structure
Using multiple gage protection structure: Die with multidrug trimming tooth (GT teeth), round back, claw back set have cemented carbide gear, surfacing resistance mo alloy, strengthen ZhaoJian and anterior apply welding, greatly improving the drill gage protection ability. 
3. Drill bit bearing structure
Adopting high precision with radial sliding, two way thrust bearings, ball tight. Tooth claw big shaft neck and two stop surface welding have wear-resisting alloy, cone big hole and two stop surface solution and silver inlaid special alloy, increase the abrasion resistance and resistance bearing vice occlusive ability, improve bearing ability of high speed vice adapt. 
4. Drill bit seal lubricants
Adopting advanced metal seal, greatly extend the drill life. 
5. Drill bit applicable
Metal seal bit stable performance, than common rubber seal bit longer life, suitable for underground power drill and high penetration rate turntable drilling. 

Available sizes:

60mm, 65mm, 76mm, 93mm,    95mm, 98mm (3 7/8" ), 101.6mm, 114mm, 118mm, 120mm, 127mm(5" )
130.1mm(5 1/8" ), 133.3mm (5 1/4" ), 139.7mm(5 1/2" ), 142.8mm    (5 5/8" ), 149.2mm (5 7/8" )
152.4mm (6" ), 155.5mm(6 1/8" ), 158.7mm(6 1/4" ), 161.9mm(6    3/8" ), 165.1mm (6 1/2" )
190.5mm (7 1/2" ), 193.6mm (7 5/8" ), 200.0mm (7 7/8" )
212.7mm(8 3/8" ), 215.9mm (8 1/2" ), 222.2mm(8 3/4" )
241.3(9 1/2" ), 244.4(9 5/8" ), 250.8(9 7/8" )
269.8(10 5/8" ), 295.3(11 5/8" )
 311.1(12 1/4" ), 346.0 (13 5/8" ), 349.2(13 3/4" )
 374.6(14 3/4" )
 381(15" ), 393.7(15 1/2" ), 406.4(16" )
 444.5(17 1/2" ), 508(20" ), 558(22" ), 609.6(24" )
 660.4(26" )

Available models:

Steel tooth (IADC code)

111, 121, 131
117, 124, 126, 127, 136, 137
 211, 311
  216, 217, 227

TCI(IADC code)

415, 435, 417, 437
515, 525, 535, 545, 517, 527, 537, 547
 615, 625, 635, , 617, 627, 637, 737
  512, 522, 532, 612, 622, 632, 732

ROSCHEN GROUP is professional in manufacturing and supplying quality hole opener as one of the leading manufacturers and suppliers in China. We now bring you high quality hole opener for sale, competitive in its excellent performance and high precision. Please rest assured to buy.


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