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Beijing Metalwork Petroleum Technology Co., Ltd
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drill collar

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Beijing Metalwork Petroleum Technology Co., Ltd

drill collar

Place of Origin : China

Brand Name : MTWK

Model Number : 014

Certification : API SPEC 7-1

Price : according to the size

Packaging Details : STEEL SHELF PACKING

Delivery Time : 30 DAYS

Payment Terms : T/T50% IN ADVANCE AND BALANCE PAID BEFORE SHIPPING

Supply Ability : 1000 PIECES PER MONTH

MOQ : 1 PIECE

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The drill collars are made of 4145H modified chromium-molybdenum alloy steel acc. to API Spec.7. All threads can be phosphated, copperised or cold worked. All threads are machined with CNC Lathes-Double-Shouldered and a special thread, the max diameter of drill collar is 14 in. We can offer Slick Collars, Spiral Collars, Trigone Drill Collars, Non-magnetic Drill Collars.
Drill Collar is mainly used to provide bit weight to drill bit so that drill pipe is in tension. Especially drill collar can keep drill bit centralized and hole track by large rigidity.
Drill Collars Technical Specification and Parameters

Connection #

OD

ID

L mm

DF

Bending strength ratio

mm

in

mm

In

mm

NC23-31

79.4

3 1/8

31.8

1 1/4

9150

76.2

2.57:1

NC26-35

88.9

3 1/2

38.1

1 1/2

9150

82.9

2.42:1

NC31-41

104.8

4 1/8

50.8

2

9150 or 9450

100.4

2.43:1

NC35-47

120.7

4 3/4

50.8

2

9150 or 9450

114.7

2.58:1

NC38-50

127

5

57.2

2 1/4

9150 or 9450

121

2.38:1

NC44-60

152.4

6

57.2

2 1/4

9150 or 9450

144.5

2.49:1

NC44-60

152.4

6

71.4

2 13/16

9150 or 9450

144.5

2.84:1

NC44-62

158.8

6 1/4

57.2

2 1/4

9150 or 9450

149.2

2.91:1

NC46-62

158.8

6 1/4

71.4

2 13/16

9150 or 9450

150

2.63:1

NC46-65

165.1

6 1/2

57.2

2 1/4

9150 or 9450

154.8

2.76:1

NC46-65

165.1

6 1/2

71.4

2 13/16

9150 or 9450

154.8

3.05:1

NC46-47

171.4

6 3/4

57.2

2 1/4

9150 or 9450

159.5

3.18:1

NC50-67

171.4

6 3/4

71.4

2 13/16

9150 or 9450

159.5

2.37:1

NC50-70

177.8

7

57.2

2 1/4

9150 or 9450

164.7

2.54:1

NC50-70

177.8

7

71.4

2 13/16

9150 or 9450

164.7

2.73:1

NC50-72

184.2

7 1/4

71.4

2 13/16

9150 or 9450

169.5

3.12:1

NC56-77

196.8

7 3/4

71.4

2 13/16

9150 or 9450

185.3

2.70:1

NC56-80

203.2

8

71.4

2 13/16

9150 or 9450

190.1

3.02:1

6 5/8 REG

209.6

8 1/4

71.4

2 13/16

9150 or 9450

195.7

2.93:1

NC61-90

228.6

9

71.4

2 13/16

9150 or 9450

212.7

3.17:1

7 5/8 REG

241.3

9 1/2

76.2

3

9150 or 9450

223.8

2.81:1

NC70-97

247.6

9 3/4

76.2

3

9150 or 9450

232.6

2.57:1

NC70-100

254

10

76.2

3

9150 or 9450

237.3

2.81:1

8 5/8REG

279.4

11

76.2

3

9150 or 9450

266.7

2.84:1

8 5/8REG

355.6

14

76.2

3

9150 or 9450

266.7

2.84:1


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