Dongying Kaihao Petroleum Equipment Co. Ltd._Drilling collar
 
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Drilling collar

 

 

 

 

Drill collar

Type of thread

O.D

I.D

Length

Beveling

diameters   

Df

Bending strength ratio for reference

mm

in

mm

in

mm

mm

NC31-41(27/8IF

104.8

4 1/8

50.8

2

9150

100.4

2.431

NC35-47

120.7

4 3/4

50.8

2

9150

114.7

2.581

NC38-50(31/2IF

127

5

57.2

2 1/4

9150

121

2.381

NC44-60

152.4

6

57.2

2 1/4

9150 or 9450

144.5

2.491

NC44-60

152.4

6

71.4

2 13/16

9150 or 9450

144.5

2.841

NC44-62

158.8

Apr-61

57.2

2 1/4

9150 or 9450

149.2

2.911

NC46-62(4IF

158.8

Apr-61

71.4

2 13/16

9150 or 9450

150

2.631

NC46-65(4IF

165.1

Feb-61

57.2

2 1/4

9150 or 9450

154.8

2.761

NC46-65(4IF

165.1

Feb-61

71.4

2 13/16

9150 or 9450

154.8

3.051

NC46-67(4IF

171.4

Apr-63

57.2

2 1/4

9150 or  9450

159.5

3.181

NC50-67(41/2IF

171.4

Apr-63

71.4

2 13/16

9150 or 9450

159.5

2.371

NC50-70(41/2IF

177.8

7

57.2

2 1/4

9150 or 9450

164.7

2.541

NC50-70(41/2IF

177.8

7

71.4

2 13/16

9150 or 9450

164.7

2.731

NC50-72(41/2IF

184.2

Apr-71

71.4

2 13/16

9150 or 9450

169.5

3.121

NC56-77

196.8

Apr-73

71.4

2 13/16

9150 or 9450

185.3

2.701

NC56-80

203.2

8

71.4

2 13/16

9150 or 9450

190.1

3.021

65/xREG″

209.6

Apr-81

71.4

2 13/16

9150 or 9450

195.7

2.931

NC61-90

228.6

9

71.4

2 13/16

9150 or 9450

212.7

3.171

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