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Home>>Product>>Drill Collar & Drill Pipe

 

Non-magnetic Drill Collar

Mechanical Property

O.D
mm

Yield Strength
ó 0.2
MPa

Tensile Strength
ó b
Mpa

Elongation
δ4
%

Reduction of area
%

Charpy
Akv
ft.1b

79.4-171.5

≥758

≥827

≥18

50

≥50

177.8-279.4

≥689

≥758

≥20

50

≥50

 

Magnetic Property:
Relative magnetic conductivity<1.010 when the magnetic intensity is 1X105 /4 πNm.

Magnetic gradient<0.05μT in the area of 100mm away from the inner bore.

drill collar

drill collar

Square Drill Collar


Square Drill Collar (hexagon or cubic) which is made of alloy cast irons AISI4145H can be divided into two kinds: drilling string and downhole. There are certain amount of wearable blocks which are made of 20-45 meshes wolfram carbide filings on each sides.

Square Drill Collar


Outside Diameter
(in)

四方对边
(in)

Inside Diameter
(in)

Strength
(in)

4 3/4

3 3/4

1 1/2

15/30

5 5/8

4 1/2

1 3/4

15/30

6 1/8

5

2

15/30

6 1/4

5

2

15/30

6 5/8

5 1/2

2

15/30

6 3/8

5 1/2

2

15/30

7 7/8

6 1/2

2 1/4

15/30

8 1/2

6 3/4

2 1/4

15/30

8 3/4

7

2 1/4

15/30

9 7/8

8

2 13/16

15/30

 

Mechanical Property


Diameter Rang

Tensile? Strength
MPa

Yield Strength
MPa

Elongation
δ4
%

Charpy
AKV
J

Brinell Hardness
HB

mm

in

79.4-171.4

3 1/8-6 3/4

≥965

≥758

≥13

≥54

≥285

177.8-279.4

7-11

≥930

≥689

≥13

≥54

≥285

 

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