Casing Drilling Systems ODEX Symmetric DTH Drill Bits

Symmetric Casing Drilling Systems: Symmetric Casing Drilling System is designed to drill holes of many sizes, ranging from 108 to 863mm (4 1/4 to 34 in), at any angle (including horizontal), to any depth (beyond 100 meters) through unconsolidated formations simultaneously with casing. The...

Product Details

Symmetric Casing Drilling Systems:

Symmetric Casing Drilling System is designed to drill holes of many sizes, ranging from 108 to 863mm (4 1/4 to 34 in), at any angle (including horizontal), to any depth (beyond 100 meters) through unconsolidated formations simultaneously with casing. The internal flushing grooves together with the built-in casing shoes gives a good seal to the button of the drilling hole, and thus minimizing the disruption of the surrounding of the drill hole. It makes the casing follow easy and the equipment and operation simple, and is recommended to a multitude of applications, such as micro-piling, underpinning, anchoring, marine work and horizontal drilling etc.

casing drilling system

casing drilling system


casing drill system

casing drill system


The Symmetric Casing 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 sacrifice 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. 

 

Symmetric Casing Drilling System Features and Advantages:

1. Stable and reliable working performance

2. Full face head design for faster penetration and straighter hole

3. Less torque is required than eccentric drilling

4. Can drill in vertical, horizontal or any direction

5. Minimize disruption to the drilled hole

6. Effective cuttings removal

7. Unlocking-relocking easily

8. Easy to operate and system security

9. Varied ring bit diameters to suit different casing requirement

10. The less vibration of drill rig


Specifications:

Casing Tube OD

Ring Bit OD

Min. Casing Shoe ID

Pilot Bit Diameter

Hammer Shank Style

mm

inch

mm

inch

mm

inch

mm

inch

108~127

4 1/4 ~ 5

118~134

4 5/8 ~ 5 1/4

78~101

3 1/16 ~ 4

77~92

3 1/32 ~

DHD3.5, Cop34, Mission 30

3 5/8

140~146

5 1/2 ~

150 ~156

5 27/64 ~

94~117

3 45/64 ~

105~124

4 1/8 ~

DHD340A, SD4, QL40, Mission40

5 3/4

6 1/8

4 5/8

4 57/64

168~178

6 5/8 ~ 7

178~195

7 ~ 7 5/8

121~150

4 3/4 ~ 5 7/8

125~156

4 59/64 ~

DHD350R, SD5, QL50, Mission50

6  9/64

194~219

7 5/8 ~

203~234

8 ~ 9 1/4

148~190

5 5/8 ~

150~203

5 7/8 ~ 8

DHD360, SD6, QL60, Mission60

8 5/8

7 1/2

219~325

8 5/8 ~

235~348

9 1/4 ~

190~284

7 1/2 ~

165~306

6 1/2 ~

DHD380, QL80, SD8, Mission 80

12 3/4

13 11/16

11  3/16

12  3/64

244~406

9 5/8 ~16

273~440

10 3/4 ~

210~364

8 1/4 ~

190~340

7 1/2 ~

SD10, Numa100

17  5/16

14  5/16

13 25/64

406~558

16 ~ 22

419~590

16 1/2 ~

328~514

12 27/32 ~

340~440

13 25/64 ~

SD12, DHD112, Numa120, Numa125

23 1/4

20 1/4

17 3/8

508~762

20 ~ 30

526 ~798

20 45/64 ~

412~716

16 1/4 ~

470~685

18 1/2 ~

ACD205

31  7/16

28  3/16

26 31/32

609~762

24 ~ 30

637~798

25 ~

513~716

20 3/16 ~

540~685

21 1/4 ~

ACD245

31  7/16

28  3/16

26 31/32

863

34

900

35  7/16

815

32  3/32

785

30 27/32

ACD325



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