Spiral Drill Collar

Spiral Drill Collar

Spiral Drill collar The major function of spiral drill collar: It is to prevent drilling tools from pressure differential block during drilling, the spiral groove allows the mud flow freely around the drill collar to balance pressure preventing pressure block, so effectively avoid bit sticking...

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Spiral Drill collar

The major function of spiral drill collar: It is to prevent drilling tools from pressure differential block during drilling, the spiral groove allows the mud flow freely around the drill collar to balance pressure preventing pressure block, so effectively avoid bit sticking from differential pressure. Spiral collar can also reduce the contact area between the wall and tubular body, so as to avoid from sticking phenomenon of drill string.

2Regular spiral drill collar materials: 4145H or 4145H MOD

3Regular spiral drill collar is B type

4Optional Structure : Spiral groove, elevator groove, slips groove, stress groove, and hard-banding

5spiral drill collar Production standard: API 7-1, API7-2 and NS-1

Spiral Drill Collar2.jpg

Why Choose our spiral drill collar?

With the sufficient mill spiral machines, hole-drilling machines, and digital control machines, greatly meet the production requirements.

All raw materials are inspected well to ensure production performance qualification by the various laboratory machines. 

Our company, with strong development ability, can improve and design special structure as per user special need on the production standard basis. 

With special cold-rolling machines and break-up and break-out machines, our company can independently achieve thread, stress relief groove, and thread running operations.

spiral drill collar Specification

Thread Connection

Outside Diameter

Inside Diameter

Overall Length

Bevel Diameter

Bending Strength Ratio

1,2

D1

D

L

D2

BSR


In

In

mm

mm


NC23-31

3 1/8

1 1/4

9150

76.2

2.57:1

NC26-35 (2 3/8 IF)

3 1/2

1 1/2

9150

84.5

2.42:1

NC31-41(2 7/8 IF)

4 1/8

2

9150 or 9450

101.6

2.43:1

NC35-47

4 3/4

2

9150 or 9450

114.7

2.58:1

NC38-50(3 1/2 IF)

5

2 1/4

9150 or 9450

121

2.38:1

NC44-60

6

2 1/4

9150 or 9450

144.5

2.49:1

NC44-60

6

2 13/16

9150 or 9450

144.5

2.84:1

NC44-62

6 1/4

2 1/4

9150 or 9450

149.2

2.91:1

NC46-62(4 IF)

6 1/4

2 13/16

9150 or 9450

150

2.63:1

NC46-65(4 IF)

6 1/2

2 1/4

9150 or 9450

154.8

2.76:1

NC46-65(4 IF)

6 1/2

2 13/16

9150 or 9450

154.8

3.05:1

NC46-67(4 IF)

6 3/4

2 1/4

9150 or 9450

159.5

3.18:1

NC50-67(4 1/2 IF)

6 3/4

2 13/16

9150 or 9450

159.5

2.37:1

NC50-70(4 1/2 IF)

7

2 1/4

9150 or 9450

164.7

2.54:1

NC50-70(4 1/2 IF)

7

2 13/16

9150 or 9450

164.7

2.73:1

NC50-72(4 1/2 IF)

7 1/4

2 13/16

9150 or 9450

169.5

3.12:1

NC56-77

7 3/4

2 13/16

9150 or 9450

185.3

2.70:1

NC56-80

8

2 13/16

9150 or 9450

190.1

3.02:1

6 5/8 REG

8 1/4

2 13/16

9150 or 9450

195.7

2.93:1

NC61-90

9

2 13/16

9150 or 9450

212.7

3.17:1

7 5/8 REG

9 1/2

3

9150 or 9450

223.8

2.81:1

NC70-97

9 3/4

3

9150 or 9450

232.6

2.57:1

NC70-100

10

3

9150 or 9450

237.3

2.81:1

8 5/8 REG

11

3

9150 or 9450

266.7

2.84:1

Provide the spiral drill collar’s specification: O.D (specification)

Provide the overall length (if non-standard)

Provide the inner bore size (if non-standard)

Provide connection type and model: thread type and whether have stress groove or not, bench mark or choosing low torque structure. 

Whether have the elevator groove, slips groove, hard-banding or undercoat (Optional)

Whether have thread, and have the shackle requirements of stress relief groove cold rolled stress or thread.

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