API Drill Collar

API Drill Collar

API Drill Collar API Drill Collar , as the main component of BHA, is at the bottom of drill string. It has the features of thick wall thickness, great gravity, and stiffness. Regular API Drill Collar materials: 4145H or 4145H MOD Regular API Drill Collar is A type (Slick drill collar) Optional...

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Product Details

API Drill Collar

API Drill Collar, as the main component of BHA, is at the bottom of drill string. It has the features of thick wall thickness, great gravity, and stiffness.

Regular API Drill Collar materials: 4145H or 4145H MOD

Regular API Drill Collar is A type (Slick drill collar)

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

Production standard: API 7-1, API7-2 and NS-1

API Drill Collar2.jpg

Why Choose Our API Drill Collar?

With the sufficient hole-drilling and digital control machines, greatly meet the production requirement.

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.

API Drill Collar Specification

number And Connection Table

Outside Dia.

Inside Dia.

Length mm

Bevel Diameter mm

Bending Strength Ratio


D1

    d


mm

   mm

    L

   D2

NC23-31

79.4

31.8

9150

76.2

2.57:1

NC26-35(2 3/8 IF)

88.9

38.1

9150

84.5

2.42:1

NC31-41(2 7/8 IF)

104.8

50.8

9150

101.6

2.43:1

NC35-47

120.6

50.8

9150

114.7

2.58:1

NC38-50(3 1/2 IF)

127

57.2

9150

121

2.38:1

NC44-60

152.4

57.2

9150 or 9450

144.5

2.49:1

NC44-60

152.4

71.4

9150 or 9450

144.5

2.84:1

NC44-62

158.8

57.2

9150 or 9450

149.2

2.91:1

NC46-62(4 IF)

158.8

71.4

9150 or 9450

150

2.63:1

NC46-65(4 IF)

165.1

57.2

9150 or 9450

154.8

2.76:1

NC46-65(4 IF)

165.1

71.4

9150 or 9450

154.8

3.05:1

NC46-67(4 IF)

171.4

57.2

9150 or 9450

159.5

3.18:1

NC50-67(4 1/2 IF)

171.4

71.4

9150 or 9450

159.5

2.37:1

NC50-70(4 1/2 IF)

177.8

57.2

9150 or 9450

164.7

2.54:1

NC50-70(4 1/2 IF)

177.8

71.4

9150 or 9450

164.7

2.73:1

NC50-72(4 1/2 IF)

184.2

71.4

9150 or 9450

169.5

3.12:1

NC56-77

196.8

71.4

9150 or 9450

185.3

2.70:1

NC56-80

203.2

71.4

9150 or 9450

190.1

3.02:1

6 5/8 REG

209.6

71.4

9150 or 9450

195.7

2.93:1

NC61-90

228.6

71.4

9150 or 9450

212.7

3.17:1

7 5/8 REG

241.3

76.2

9150 or 9450

223.8

2.81:1

NC70-97

247.6

76.2

9150 or 9450

232.6

2.57:1

NC70-100

254

76.2

9150 or 9450

237.3

2.81:1

8 5/8 REG

279.4

76.2

9150 or 9450

266.7

2.84:1

Provide the API 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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