Overburden Drill Bit overburden drilling system 70mm - 400mm OD
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Overburden Drill Bit overburden drilling system 70mm - 400mm OD
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Features
Basic Infomation
Place of Origin: China
Brand Name: ROSCHEN
Certification: ISO
Model Number: 70 mm - 400 mm
High Light:

symmetrix drilling system

,

symmetrix casing system

,

Overburden Drill Systems and Accessories

Payment & Shipping Terms
Packaging Details: wooden box, carton
Delivery Time: 5-15days
Supply Ability: 300 pcs per month
Specifications
System: Toughest Overburden Drilling System
Drilling: Mitsubishi Overburden Drilling System
Manufacturer: Overburden Drilling Manufacturer
Item No: Symmetrix Drilling System
Casing: Symmetrix Casing System
China: China Drilling System
Type: Numa Drilling System
Origin: China Concentric Drilling Systems
Accessories: Overburden Drill Systems And Accessories
Drill Bit: Overburden Drill Bit Overburden Drilling
Product Description

 

Overburden Drill Bit overburden drilling system 70mm - 400mm OD

 

The Stratex Drill System
 

The Stratex Drill System (SDS) is an overburden drilling system designed for conditions where a cased hole is required. Collapsing holes tend to make overburden drilling expensive, with lost drilling equipment and down time.

 

In cooperation with drillers and drilling contractors, the SDS was developed to overcome these problems. The patented eccentric design and the Drop Off Ring (DOR) drill bits enable the drill string and casing to be lowered in the hole simultaneously with a conventional hammer drilling system.

 

The SDS eccentric designed bit rotates outward and drills a larger diameter hole than the casing, avoiding cave-ins, wash-outs, and other problems common in normal drilling operations in soft and gravel-type strata or loose rock. Since 90% of the world's overburden drilling is in loose strata, potential utilization of the SDS is enormous.

 

After reaching the designated depth, the SDS reamer-bit is retracted by reversing the direction of the rotation and by applying tension on the reamer-bit, which has a taper and will retract into the casing for easy removal of the entire drill-string. This leaves the casing in place for other applications or for removal at a later date. The SDS method is designed for use with flush joint threaded pipe or welded-type casing and provides a bit size for a wide variety of different casing wall thicknesses.

 

Advantages of SDS:

  1. Low capital investment
  2. High drilling performance
  3. No rotation of the casing
  4. Compatible with most drilling rigs
  5. Virtually no casing stress
  6. Casing is simultaneously lowered by the guide device and to deeper depths than other methods allow
  7. Cost and on-site time reduced due to better penetration rates, easier bit changes, and stable hole conditions
  8. Smaller pilot bit for faster and better penetration

 

Applications:

  1. Blast holes
  2. Water supply wells
  3. Bridge and building foundations
  4. Standard slant or horizontal drilling
  5. Mining air holes
  6. Environmental monitoring wells
  7. Grouting operations
  8. Seismic shot holes
  9. Soil sample and geotechnical applications
  10. Ground anomaly and tiebacks
  11. Storage caverns and dam

Accessories Available with SDS:

  1. Drop Off Ring (DOR)
  2. Drill pipe and subs
  3. Threaded casings
  4. Casing drive shoes
  5. Hydraulic casing pullers
  6. Stabilizers
  7. Discharge heads
  8. Casing wing-nuts
  9. Shock subs
  10. Drill bits
  11. Fishing tools
  12. Air swivels

Overburden Drill System

 

Assembly of the Stratex System

 

The Stratex Drilling Method is used with air rotary drilling rigs and most manufacturers' downhole hammers. The drill rod is connected to the rig top drive using a changeover sub or swivel sub. The drill rod is then connected to the down-hole hammer by the same method. The chuck nut and split rings are removed to insert the guide device shank and secured by replacing the split rings and chuck nut.

The reamer bit, in the closed position, is now inserted into the casing shoe. Since the percussion hammer is at the bottom of the hole, working directly above the drill bit, the force to pull down the casing tube is transferred by way of the casing shoe. The exhaust air from the drill redirects the loose cuttings up through the groves on the guide device, forcing them up between the drill rod and the casing wall out through the discharge head, which is attached to the casing tube. By using a discharge head, drilling is not only safer but also environmentally cleaner. Stratex can be used with foam or water to aid in cutting removal.

 

 

Good Flushing

 

Good Flushing is essential with any successful drilling operation or in using an overburden drilling system. The Stratex System provides air jets above and below the guide device, creating a vacuum across the face of the reamer bit, removing the cuttings with greater annular velocity. The gauge carbides along the side of the pilot and reamer bit act to crush the cuttings into finer particles, the majority of which are removed from the hole. The remaining cuttings are forced back into the walls of the cavity, leaving less material to be extracted from the hole.

Overburden Drill Bit overburden drilling system 70mm - 400mm OD 0

 

Overburden Drill Bit overburden drilling system 70mm - 400mm OD 1

Advantages:

  • Efficient removal of cuttings from above the guide device, which prevents the hammer from jamming and torque problems
  • Removal of fine cuttings from around the bit system and casing creates less friction and achieves deeper depths and easier casing removal
  • Reduction in losses due to circulation problems by increased vacuum in cutting removal
  • For unique applications, the annular velocity can be increased by changing the airflow in the reamer pilot system

 

  1. One-piece reamer and pilot bit
  2. One-piece guide device and shank
  3. Casing with shoe sleeve
  4. Casing
  5. Wing-nut centralizing system
  6. Drill rod
  7. Casing adapter
  8. Discharge head
  9. Swivel sub
 

Air velocity is important for efficient hole cleaning. A minimum return air velocity of 4000 feet per minute is desirable. Annular space between drill pipe and the drilled hole as well as compressor capacity determines the air velocity. The annular air velocity in foot per minute can be calculated with the following formula if air consumption and annular area are known:

 

annular air velocity (fpm) =

  free air consumed (cfm) x 144

 

  annular area (sq. in.)*

 

*annular area = .7854 x (hole diameter - drill pipe OD)
 

The following flushing mediums are also useful:

  • Air with water injection
  • Air with foam injection
     

NOTE: Foam has the ability to lift cuttings and stabilizes the wall of the hole and provides lubrication for easier casing penetration. Foam also has good drilling performance in most types of clay.


The Stratex Drill System    
    

Drilling Rod

Overburden Drill Bit overburden drilling system 70mm - 400mm OD 2

 

 

Wiper Cover
Wipers

Discharge Body

Discharge Clamp
Adapter

Blank Casing End

Adapter Clamp

Replaceable Grippers

Pin End

Box End

Casing

Hammer Shank

Guide Device

Casing Shoe

Reamer Bit

The Stratex System utilizes a one-piece reamer and pilot bit that moves outward to full open position on an eccentric shaft by rotating a half turn to the right.

This reamer pilot bit system opens a larger diameter hole than the diameter of the casing. The casing is simultaneously lowered into the hole as the reamer pilot bit drills. The pilot bit is rotated at 10 to 40 rpm while drilling with the hammer.

When the designated drilling depth is reached, the reamer pilot bit system is retracted into the casing by applying slight tension and reversing the direction of the drilling rotation. The design of the reamer pilot bit system incorporates a closed bearing method that makes the loss of the pilot bit virtually impossible. This bit system, in the closed position, is easily removed through the casing shoe and casing.

Working
Position

Overburden Drill Bit overburden drilling system 70mm - 400mm OD 3

Retracted
Position

Overburden Drill Bit overburden drilling system 70mm - 400mm OD 4

Overburden Drill Bit overburden drilling system 70mm - 400mm OD 5

 

Telescopic Drilling

 

Using a telescoping drilling method can achieve deeper depths.
 

Some string samples are as follows:

365

240

190

140

90

 

365

215

165

115

 

 

365

215

140

90

 

 

Casing depths with Stratex can reach 500 feet or more with the down-hole hammer versions depending on the type of formation, drilling equipment, and drilling personnel experience.

 

Hole Depth

 

Stratex System (mm)

70

80

90

115

140

165

190

215

240

365

Normal Max - Hole Depth (ft)

200

250

300

500

500

500

500

-

-

-

 

The Stratex Drilling Method
 

The Ultimate Drilling Method
 

The Overburden Drilling Method that was designed by drillers for drillers. Overburden material strikes when least expected. Be prepared. Use Stratex!
 

The PATENTED Stratex Drill System:

 

Overburden Drill Bit overburden drilling system 70mm - 400mm OD 6

1.      One-piece shank and guide device manufactured from the highest quality material with stringent quality control.

2.      Air jets are used to prevent any malfunction of the opening and retraction of the reamer pilot bit operation and the clearing of cuttings above the reamer pilot bit system.

3.      Sealed bearing system for ease in rotating the eccentric bit outward or retracting it into the casing.

4.      Casing with shoe: Casing may be supplied with plain or threaded ends.

5.      Grooved bypass directly above the lock system to clear cuttings and ensure complete drilling face contact.

6.      Tapered shoulder on the reamer bit eliminates casing binding and assists in the retracting of the reamer bit into the casing.

7.      One-piece reamer and pilot bit manufactured from the highest quality material, with stringent quality control.

8.      Gauge protection carbides on heavy duty, one-piece pilot and reamer bit.

9.      Dome carbides on heavy duty pilot and reamer bit.


The ROSCHEN DROP-OFF RING UNDER REAMER
 

Overburden Drill Bit overburden drilling system 70mm - 400mm OD 7

Used when concentric drilling is a requirement:

  • High performance drilling
  • One-piece reamer
  • One-piece guide device
  • Made from tough heat-treated alloy steel
  • Studded with an aggressive array of tungsten carbide inserts
  • Lower drilling costs per foot
  • Guaranteed performance*
  • Guaranteed service
  • Large range of accessories
  • Manufactured under strict quality-controlled conditions

*When used in conjunction with manufacturer's recommendations and specifications.

 

Drop-Off Ring Under Reamer
 

Tool
Size

Casing
OD (IN)
a

Nominal
Casing Size
(IN)

Casing
Wall

Casing
Show i/d
b

Hole
Dia.
c

70 mm

3.5

3.0

.216

2.75

3.75

80 mm

4.0

3.5

.266

3.125

4.875

90 mm

4.5

4.0

.237

3.625

5.0

115 mm

5.563

5.0

.258

4.5

6.125

140 mm

6.625

6.0

.280

5.5

7.5

165 mm

7.625

7.0

.301

6.5

8.75

190 mm

8.625

8.0

.322

7.5

9.75

210 mm

9.625

9.0

.342

8.350

11.0

215 mm

10.0

9.5

.350

8.625

11.125

240 mm

10.75

10.0

.365

9.525

11.25

 

TOOLS OF EXCELLENCE AND DURABILITY FOR OVER 30 YEARS
 

Overburden Drill Bit overburden drilling system 70mm - 400mm OD 8

Recommended Maximum Air Pressure for Stratex Drill Systems

The maximum recommended air pressure for Stratex drilling with down-hole hammers is 12 bar, which equals 210 psi.

Rotation speed depends on the size of the Stratex bit and the formation being drilled. The rotation speed may have to be varied as the formation changes. The table shows recommended rotation speeds for the various Stratex sizes.

 

Recommended Rotation Speeds
 

Stratex System (mm)

70

80

90

115

140

165

190

215

240

280

Speed (rpm)

20 - 40

10 - 25

 

Drill rigs must have sufficient torque for drilling with Stratex. The table shows recommended rotation speeds for the various Stratex bit sizes.
 

Hole Depth
 

Stratex System (mm)

70

80

90

115

140

165

190

215

240

280

Minimum Torque (ft/lb)

570

600

663

1470

2200

2950

4000

4000

4000

7000

 

"ROSCHEN provides the widest range of flexibility when it comes to casing wall size
thickness, which makes it a high demand by users. All systems complete and ready for
resale within a week or two, a time frame that cannot be met by other manufacturers."

 

Stratex Over Burden Drilling Tool: Size and Technical Chart
 

Tool Size

Casing Sizes

Drive Shoe I.D.
(B)

Drive Shoe Length
(C)

Guide to Casing Distance
(D)

Reamed Diameter
(E)

Bit
Size
(F)

Guide to Casing Distance
(D)

Nominal Size

O.D.
(A)

Walls
(S)

70

3

3.50

.216

2.750

2.5

4.25

3.75

2.75

2.968

80

3.5

4.0

.237

3.156

2.75

4.5

4.375

3

3.437

90

4

4.5

.247

3.650

3.5

5

5

3.5

3.937

110

5

5.562

.375

4.375

5.5

7.50

6.125

4.25

4.75

115

5

5.562

.258

4.575

5.5

7.50

6.125

4.25

4.937

132

6

6.625

.432

5.188

5

7.75

7.5

4.875

5.593

140

6

6.625

.280

5.575

5

7.75

7.5

5.125

5.937

142

7

7

.498

5.575

5

7.625

7.875

5.25

5.875

150

7

7

.272

5.937

5

7.625

7.875

5.25

6.375

160

7

7.625

.500

6.036

5.5

8.25

8.75

6.125

6.500

165

7

7.625

.301

6.575

5.5

8.25

8.75

6.25

6.937

180

8

8.625

.500

7.075

6

8.75

10

6.75

7.535

190

8

8.625

.277

7.575

6

8.75

10

7.375

7.937

200

9

9.625

.500

7.937

6

9

11

7.625

8.437

210

9

9.625

.342

8.312

6

9

11

8

8.845

215

10

10

.250

8.625

6

9

11

8

9.250

230

10

10.75

.500

9.050

7

10.25

11.75

8.75

9.625

235

10

10.75

.365

9.275

7

10.25

11.75

9

9.890

250

11

11.75

.500

10

7

10.75

13.25

9.625

10.62

260

11

11.75

.375

10.25

7

10.75

13.25

10

10.87

280

12

12.75

.500

10.937

7

11

14.5

10.625

11.56

300

13.37

13.375

.430

*

8

12

15

10.625

*

310

14

14

.500

12.25

8

12

15.75

12

12.87

360

16

16

.500

14.25

10

14.25

18

14

14.87

410

18

18

.500

*

10

*

20

15

*

420

18.62

18.62

.430

*

10

*

20.37

15

*

455

20

20

.500

*

11

*

22

17.5

*

510

22

22

.500

20.075

11

16

24

18

*

560

24

24

.500

22.075

11

16.5

26

20

22.75

610

26

26

.500

23.875

12

17

28

22

*

660

28

28

.500

25.875

12

17.5

30

24

*

710

30

30

.500

27.875

12

19

32.5

26

*

760

32

32

.500

29.875

14

21

34.5

28

*

810

34

34

.500

31.875

14

21.5

36.5

30

32.62

860

36

36

.500

33.75

14

23

38.5

32

*

1000

42

42

.500

39.375

16

*

44.5

38

*

1150

48

48

.500

45.375

16

*

51

42

*


Overburden Drill System

THE STRATEX CENTRO*

Overburden Drill Bit overburden drilling system 70mm - 400mm OD 9

The latest concentric under reamer used for large diameter

requirements:

  • High performance drilling
  • Five retractable wings
  • Made from tough heat-treated alloy steel
  • Studded with an aggressive array of tungsten carbide inserts
  • Lower drilling costs per foot
  • Guaranteed performance**
  • Guaranteed service
  • Large range of accessories
  • Qualified, dedicated staff
  • Manufactured under strict quality-controlled conditions
  • Sizes from 20"
  • Custom sizes available

**When used in conjunction with manufacturer's recommendations and specifications

 

Tool Size

Casing Sizes

Drive Shoe

Drive Shoe Length

Guide to Casing Dist.

Reamed Diameter

Guide O.D.

DIM
(mm)

Nominal Size

O.D.

Max
Wall

 

 

 

 

 

460

20

20.000

0.500

18.125

9.000

14.00

21.250

18.750

510

22

22.000

0.500

20.125

10.000

15.50

23.250

20.750

560

24

24.000

0.500

22.125

10.000

15.50

25.250

22.750

610

26

26.000

0.500

24.125

11.000

16.50

27.250

24.750

660

28

28.000

0.500

26.125

12.000

17.50

29.250

26.750

710

30

30.000

0.500

27.875

12.000

19.00

32.500

*

760

32

32.000

0.500

29.875

14.000

21.00

34.500

*

810

34

34.000

0.500

31.875

14.000

21.50

36.500

36.620

860

36

36.000

0.500

33.750

14.000

23.00

38.500

*

1000

42

42.000

0.500

39.375

16.000

*

44.500

*

1150

48

48.000

0.500

45.375

16.000

*

51.000

*


Overburden Drill Bit overburden drilling system 70mm - 400mm OD 10
Overburden Drill Bit overburden drilling system 70mm - 400mm OD 11

Overburden Drill Bit overburden drilling system 70mm - 400mm OD 12
 

For more information please contact:

ROSCHEN INC.
ROSCHEN GROUP LIMITED
ROSCHEN HOLDINGS LIMITED

Skype: ROSCHEN.TOOL , ROSCHEN_GROUP

WeChat: +86-137 6419 5009 ; +86-135 8585 5390

WhatsApp: +86-137 6419 5009 ; +86-135 8585 5390

Email: roschen@roschen.com ; roschen@roschen.net

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