Drill Collar

  • Description
Product Detail

Vigor Drilling is one of pioneer Downhole Drilling Stabilizers manufacturers in Oil industry. Our Downhole Drilling Stabilizers Drill Collar/Slick Drill Collar/standard Drill collar/Spiral Drill Collar/Non magnetic Drill collar/Drill collar hollow bar, all Drill collars are extra-heavy integral tools used to concentrate weight onto the drill bit for drilling and keeps the drill sting in tension. Mill test certificate conformance to API Spec. 7-1, NS-1, DS-1 and Customer requirements. Our company is the high quality drill collars manufacturers.Slick Non magnetic Drill collar/ Non magnetic Spiral Drill collar/Flex Non magnetic Drill collar, they are function as housing for the MWD tools and provide weight for drilling string.

China Vigor’s Drill Collar/Spiral Drill Collar, materials include AISI 4145H, AISI4145H modified steel and Non-magnetic. Drill collars type they are Spiral Drill collar,Slick,Flex and with Slip and /or Elevator Recess.

Features and Benefits:
1. API stress relief groove pin connection; API Bore back Box Connection.
2. Cold Rolling Thread roots—to improve fatigue resistance of connection.
3. Phosphate coated connections- to prevent corrosion and galling upon initial make-up.
4. A hardness range of 285 to 341 BHN and a Charpy impact value of 40 ft-lbs are guaranteed at evenly distributed 16 points in any sections at room temperature;

Special Features:
1.Spiral Grooving- to avoid differential pressures sticking in the hole.
2.Stress Relief Groove & Bore back Box
3.Hardbanding if required.
4.Slip and Elevator Recess-to improve downhole handling efficiency and safety.

OD

ID

Length mm

Style of connection

Bevel diameter 
mm		Bending 
strength ratio

mm

in

mm

in

79.4

3 1/8

31.8

1 1/4

9150

NC23-31

76.2

2.57:1

88.9

3 1/2

38.1

1 1/2

9150

NC26-35(23/8IF)

82.9

2.42:1

104.8

4 1/8

50.8

2

9150

NC31-41(27/8IF)

100.4

2.43:1

120.7

4 3/4

50.8

2

9150

NC35-47

114.7

2.58:1

127.0

5

57.2

2 1/4

9150

NC3850(31/2IF)

121.0

2.38:1

152.4

6

57.2

2 1/4

9150or9450

NC44-60

144.5

2.49:1

158.8

6 1/4

57.2

2 1/4

9150or9450

NC44-62

149.2

2.91:1

158.8

6 1/4

71.4

2 13/16

9150or9450

NC46-62(4IF)

150.0

2.63:1

165.1

6 1/2

57.2

2 1/4

9150or9450

NC46-65(4IF)

154.8

2.76:1

165.1

6 1/2

71.4

2 13/16

9150or9450

NC46-65(4IF)

154.8

3.05:1

171.4

6 3/4

57.2

2 1/4

9150or9450

NC46-67(4IF)

159.5

3.18:1

171.4

6 3/4

71.4

2 13/16

9150or9450

NC50-67(41/2IF)

159.5

2.37:1

177.8

7

57.2

2 1/4

9150or9450

NC50-70(41/2IF)

164.7

2.54:1

177.8

7

71.4

2 13/16

9150or9450

NC50-70(41/2IF)

164.7

2.73:1

184.2

7 1/4

71.4

2 13/16

9150or9450

NC50-72(41/2IF)

169.5

3.12:1

196.8

7 3/4

71.4

2 13/16

9150or9450

NC50-77

185.3

2.70:1

203.2

8

71.4

2 13/16

9150or9450

NC50-80

190.1

3.02:1

209.6

8 1/4

71.4

2 13/16

9150or9450

6 5/8REG

195.7

2.93:1

228.6

9

71.4

2 13/16

9150or9450

NC61-90

212.7

3.17:1

241.3

9 1/2

76.2

3

9150or9450

7 5/8REG

223.8

2.81:1

247.6

9 3/4

76.2

3

9150or9450

NC70-97

232.6

2.57:1

254.0

10

76.2

3

9150or9450

NC70-100

237.3

2.81:1

279.4

11

76.2

3

9150or9450

8 5/8REG

266.7

2.84:1

Mechanical Property:
Mechanical Property of Slick and Spiral Drill Collar made of AISI 4145 H

OD Range

Yield

Strength(MPa) 

Tensile 

Strength(MPa) 

Elongation 

(%) 

Hardness 

(HB)

Impact           Test(J) 

mm

in

79.4-171.4

3 1/8-6 3/4

     =758

        =965

         =13

285~341

       =54

177.8-279.4

7--11

     =689

        =930

         =13

285~341

       =54

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