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QingDao Hyster Petroleum Equipment Co.,Ltd
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QingDao Hyster Petroleum Equipment Co.,Ltd

Drill Collar

According to API Spec.7 and SY/T5144, drill collar is made of AISI 4145 modified chromium- molybdenum alloy steel.
All threads are phosphated,copperized or cold rolled and they are machined with CNC Lathes–Double–shoulderd,including
some special threads. The maximum outer diameter of drill collars can amount to 14 inch.
Specifications


Connections
OD
ID
L mm
corner
DFmm
Strength ratio
mm
in
mm
in
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
127.0
5
57.2
2 1/4
9150 or 9450
121.0
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
150.0
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
NC46-67
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 5/8REG
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 5/8REG
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
254.0
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


Mechanical Properties of Drill Collar
OD
Yield Strength
σ0.2
MPa
Tensile
Strength
σb
MPa
Elongation
δ4
%
BH
Charpy Impact
Ak
J
mm
in
79.4~171.4
3 1/8~6 3/4
≥758
≥965
≥13
≥285
≥54
177.8~279.4
7~11
≥689
≥930

Tolerances of Drill Collar
OD
OD
ID
L
Shoulder
corner DF
mm
in
≤88.9
≤3 1/2
+1.20
+1.60
±152.4
±0.4
>88.9~114.3
>3 1/2~4 1/2
+1.60
>114.3~139.7
>4 1/2~5 1/2
+2.00
>139.7~165.1
>5 1/2~6 1/2
+3.20
>165.1~215.9
>6 1/2~8 1/2
+4.00
>215.9~241.3
>8 1/2~9 1/2
+4.80
>241.3
>9 1/2
+6.40
Stress Relief of Connections
Connections
Lx
±1.59mm
Dcb
+0.40-0mm
±20.83mm/m
DRC
+0-0.79mm
LRG+0-3.18mm
NC35
82.6
82.15
166.67
82.15
85.73
NC38
88.9
88.11
166.67
89.10
92.08
NC40
101.6
92.87
166.67
95.81
104.78
NC44
101.6
101.60
166.67
106.36
104.78
NC46
101.6
106.76
166.67
109.93
104.78
NC50
101.6
117.48
166.67
120.45
104.78
NC56
114.3
121.84
250.00
134.04
117.48
NC61
127.0
132.95
250.00
148.31
130.18
NC70
139.7
152.00
250.00
170.54
142.88
NC77
152.4
166.29
250.00
188.01
155.58
6 5/8REG
114.3
134.14
166.67
137.59
117.48
7 5/8REG
120.7
148.83
250.00
161.26
123.83
8 5/8REG
123.8
172.24
250.00
185.45
127.00
Dimensions of Elevator and Slip Recesses
Drill collar OD
Depth of
elevator
±0.2
R1c
Angle
αb
Depth of
slip recesses
±0.4
Angle
βb
101.6~117.5
5.6
3.2±0.4
4.8
3.5°
120.6~142.9
6.4
3.2±0.4
4.8
3.5°
146.0~168.3
7.9
3.2±0.4
6.4
171.4~219.1
9.5
4.8±0.8
7.5°
6.4
≥222.2
11.1
6.4±0.8
6.4

Product Tags:

Drill Collar

      

OCTG

      

API Spec.7

      
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