CHINA SCOTON OILFIELD EQUIPMENT CO., LTD.

Drill collar is made of rolled or forged AISI 4145H chrome molybdenum alloy steel for effective control of chemical composition and trace element content.

Drill collar is at the lowest part of the drill string and is the main component of the lower drill assembly. Its main feature is the wall thickness (usually 38 ~ 53mm, equivalent to the drill pipe wall thickness of 4 to 6 times), with greater gravity and stiffness.

Drill collar parameters

Nominal size

D

d

Lmm

DF(mm)

Bending Strength ratio

mm

In

mm

in

NC31-41(2-7/8IF)

104.8

4-1/8

50.8

2

9150

100.4

2.43:1

NC35-47

120.7

4-3/4

50.8

2

9150

114.7

2.58:1

NC38-50(3-1/2IF)

127.0

5

57.2

2-1/4

9150

121.0

2.38:1

NC44-60

152.4

6

57.2

2-1/4

9150/9450

144.5

2.49:1

NC44-60

152.4

6

71.4

2-13/16

9150/9450

144.5

2.84:1

NC44-62

158.8

6-1/4

57.2

2-1/4

9150/9450

149.2

2.91:1

NC46-62(4IF)

158.8

6-1/4

71.4

2-13/16

9150/9450

150.0

2.63:1

NC46-65(4IF)

165.1

6-1/2

57.2

2-1/4

9150/9450

154.8

2.76:1

NC46-65(4IF)

165.1

6-1/2

71.4

2-13/16

9150/9450

154.8

3.05:1

NC46-67(4IF)

171.4

6-3/4

57.2

2-1/4

9150/9450

159.5

3.18:1

NC50-67(4-1/2IF)

171.4

6-3/4

71.4

2-13/16

9150/9450

159.5

2.37:1

NC50-70(4-1/2IF)

177.8

7

57.2

2-1/4

9150/9450

164.7

2.54:1

NC50-70(4-1/2IF)

177.8

7

71.4

2-13/16

9150/9450

164.7

2.73:1

NC50-72(4-1/2IF)

184.2

7-1/4

71.4

2-13/16

9150/9450

169.5

3.12:1

NC56-77

196.8

7-3/4

71.4

2-13/16

9150/9450

185.3

2.70:1

NC56-80

203.2

8

71.4

2-13/16

9150/9450

190.1

3.02:1

6-5/8REG

209.6

8-1/4

71.4

2-13/16

9150/9450

195.7

2.93:1

NC61-90

228.6

9

71.4

2-13/16

9150/9450

212.7

3.17:1

7-5/8REG

241.3

9-1/2

76.2

3

9150/9450

223.8

2.81:1

NC70-97

247.6

9-3/4

76.2

3

9150/9450

232.6

2.57:1

NC70-100

254.0

10

76.2

3

9150/9450

237.3

2.81:1

Leave a Message Email Us

we will contact you within 24 hours.

  • TEL:+86-029-62827813
  • FAX:+86-029-62827812
  • EMAIL:sales@scotonpetro.com
  • ADDRESS:Hi-Tech Development zone, Xi'an China