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DRILL Collar

 

Standard: API SPEC 7
Material: 4145H or Non Magnetic
Type:Slick Drill Collar, Spiral Drill Collar, Non mag Drill Collar

Standard size, bores and connection for drill collars

Style of connection
OD
ID
Length mm
Bevel diameter mm
Bending strength ratio
in
in
NC23-31
3 1/8
1 1/4
9150
76.2
2.57:1
NC26-35
(2 3/8IF)
3 1/2
1 1/2
9150
82.9
2.42:1
NC31-41
(2 7/8IF)
4 1/8
2
9150
100.4
2.43:1
NC35-47
4 3/4
2
9150
114.7
2.58:1
NC3850
(3 1/2IF)
5
2 1/4
9150
121.0
2.38:1
NC44-60
6
2 1/4
9150 or 9450
144.5
2.49:1
NC44-62
6 1/4
2 1/4
9150 or 9450
149.2
2.91:1
NC46-62(4IF)
6 1/4
2 13/16
9150 or 9450
150.0
2.63:1
NC46-65(4IF)
6 1/2
2 1/4
9150 or 9450
154.8
2.76:1
NC46-65(4IF)
6 1/2
2 13/16
9150 or 9450
154.8
3.05:1
NC46-67(4IF)
6 3/4
2 1/4
9150 or 9450
159.5
3.18:1
NC50-67
(4 1/2IF)
6 3/4
2 13/16
9150 or 9450
159.5
2.37:1
NC50-70
(4 1/2IF)
7
2 1/4
9150 or 9450
164.7
2.54:1
NC50-70
(4 1/2IF)
7
2 13/16
9150 or 9450
164.7
2.73:1
NC50-72
(4 1/2IF)
7 1/4
2 13/16
9150 or 9450
169.5
3.12:1
NC50-77
7 3/4
2 13/16
9150 or 9450
185.3
2.70:1
NC50-80
8
2 13/16
9150 or 9450
190.1
3.02:1
6 5/8REG
8 1/4
2 13/16
9150 or 9450
195.7
2.93:1
NC61-90
9
2 13/16
9150 or 9450
212.7
3.17:1
7 5/8REG
9 1/2
3
9150 or 9450
223.8
2.81:1
NC70-97
9 3/4
3
9150 or 9450
232.6
2.57:1
NC70-100
10
3
9150 or 9450
237.3
2.81:1
8 5/8REG
11
3
9150 or 9450
266.7
2.84:1

Mechanical properties of drill collar

OD of drill collar
in

考b
Tensile strengt
MPa

考0.20
Yield strength
MPa

汛4
Elongation
%

Akv
Charpy impact
J

HB
Hardness
(Brinell)

3 1/8 --6 3/4

≡ 965

≡ 758

≡ 13

≡ 54

285--341

7--11

≡ 930

≡ 689

≡ 13

≡ 54

285--341

Spiral grooved drill collors sizes

OD

Depth of cut
mm

Spiral pitch
mm

Depth of cut
mm

mm

in
         

98.4

37/8

﹛4.0 ㊣0.79

﹛914

  

101.6--111.1

﹛4-43/8

﹛4.8 ㊣0.79

﹛914

  

114.3--130.2

﹛41/2-51/8

﹛5.6 ㊣0.79

﹛965

  

133.4--146.1

﹛51/4-53/4

﹛6.4 ㊣0.79

﹛1067

  

149.2--161.9

﹛57/8-63/8

﹛7.1 ㊣1.59

﹛1067

  

165.1--177.8

﹛61/2-7

﹛7.9 ㊣1.59

﹛1168

  

181.0--200.0

﹛71/8-77/8

﹛8.7 ㊣1.59

﹛1626

5.6 ㊣0.79

203.2--225.4

﹛8-87/8

﹛9.5 ㊣1.59

﹛1727

6.4 ㊣0.79

228.6--250.8

﹛9-97/8

﹛10.3 ㊣2.37

﹛1829

7.1 ㊣1.59

254.0--276.2

﹛10-107/8

﹛11.1 ㊣2.37

﹛1930

7.9 ㊣1.59

﹛279.4

﹛11

﹛11.9 ㊣2.37

﹛2032

8.7 ㊣1.59


Non magnetic drill collar could meet following properties:

  • For OD 79.4- -171.4mm (3 5/8"--6 3/4")

    Hardness: 285--341BHN
    Yield strength: 考 0.2≡758MPa
    Tensile strength: 考 b ≡827MPa
    Elongation: 汛4ㄗ%ㄘ ≡18

  • For OD 177.8- -279.4mm (7"--11")

    Hardness: 285--341BHN
    Yield strength: 考 0.2≡689MPa
    Tensile strength: 考 b ≡758MPa
    Elongation: 汛4ㄗ%ㄘ ≡20
    Magnetic Permeability (MPS=1X105 /4羽 A/m)
    Average: Ur≒1.010
    Magnetic Field Gradient: 忖B≒0.05米T
       
Click pictures to enlarge

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