| Customization: | Available |
|---|---|
| After-sales Service: | Yes |
| Warranty: | 1 Year |
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Drill collar is a bar made of solid steel, either common carbon steel or non-magnetic steel alloy. It is used in the drilling of oil wells for weighting drill bit, enabling it to drill through rock. Drill collar is the lowest element of a drill string. Our drill collars are manufactured strictly according to API standard.
There are different kinds of drill collars,including round drill collar,spiral drill collar,non-magnetic drill collar,square drill collar and so on.Ordinary drill collar is the circular cross section, the center has a water hole,the wall thickness is larger,the nozzle is smaller, the weight of per unit length is greater than the size of drill pipe almost 4- 5 times .The majority of drill collar is thread processing directly on the pipe body , but some of them also use the replaced joint
1. Material: P550,P540,P530
2. Shape: It is the round pipe with smooth surface and thick wall, and the both ends are machined screw thread for connection.
3. Use: It is mainly used for the inspection in the process of petroleum drilling.
4. Standard: API Spec 7-1 or SY/T5144 Standard.
5. Inspection&Test: When producing, traceability are maintained from the receipt of raw material to completion of final products, and serial numbers are die-stamped on each workpiece body. During each manufacturing process, inspection and test are performed.
6. Magnetic permeability(MPS=1×105/4∏A/m)
1). Average: Ur<1.010.
2). Magnetic Field Gradient: ΔB≤0.05μT.
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Size
|
O.D(mm)
|
I.D.(mm)
|
Code
|
Thread
|
Length(mm)
|
Weight(kg)
|
|
3-1/8
|
79.4
|
31.8(1-1/4)
|
NC23-31
|
NC23
|
9140
|
298
|
|
3-1/2
|
88.9
|
38.1(1-1/2)
|
NC26-35
|
NC26
|
9140
|
364
|
|
4-1/8
|
104.8
|
50.8(2)
|
NC31-41
|
NC31
|
9140/9450
|
474/490
|
|
4-3/4
|
120.6
|
50.8(2)
|
NC35-47
|
NC35
|
9140/9450
|
674/697
|
|
5
|
127
|
57.2(2-1/4)
|
NC38-50
|
NC38
|
9140/9450
|
725/749
|
|
6
|
152.4
|
57.2(2-1/4)
|
NC44-60
|
NC44
|
9140/9450
|
1125/1163
|
|
71.4(2-13/16)
|
NC44-60
|
9140/9450
|
1022/1056
|
|||
|
6-1/4
|
158.8
|
57.2(2-1/4)
|
NC44-62
|
NC44
|
9140/9450
|
1237/1279
|
|
71.4(2-13/16)
|
NC46-62
|
9140/9450
|
1134/1172
|
|||
|
6-1/2
|
165.1
|
57.2(2-1/4)
|
NC46-65
|
NC46
|
9140/9450
|
1352/1398
|
|
71.4(2-13/16)
|
NC46-65
|
NC50
|
9140/9450
|
1249/1291
|
||
|
6-3/4
|
171.4
|
57.2(2-1/4)
|
NC46-67
|
NC46
|
9140/9450
|
1471/1521
|
|
7
|
177.8
|
57.2(2-1/4)
|
NC50-70
|
NC50
|
9140/9450
|
1597/1651
|
|
71.4(2-13/16)
|
NC50-70
|
9140/9450
|
1494/1545
|
|||
|
7-1/4
|
184.2
|
71.4(2-13/16)
|
NC50-72
|
NC50
|
9140/9450
|
1625/1680
|
|
7-3/4
|
196.8
|
71.4(2-13/16)
|
NC56-77
|
NC56
|
9140/9450
|
1895/1960
|
|
8
|
203.2
|
71.4(2-13/16)
|
NC56-80
|
NC56/6-5/8REG
|
9140/9450
|
2040/2109
|
|
8-1/4
|
209.6
|
71.4(2-13/16)
|
6-5/8REG
|
6-5/8REG
|
9140/9450
|
2188/2263
|
|
9
|
228.6
|
71.4(2-13/16)
|
NC61-90
|
NC61
|
9140/9450
|
2658/2748
|
|
9-1/2
|
241.3
|
76.2(2-13/16)
|
7-5/8REG
|
7-5/8REG
|
9140/9450
|
2954/3054
|
|
9-3/4
|
247.6
|
76.2(3)
|
NC70-97
|
NC70
|
9140/9450
|
3127/3234
|
|
10
|
254
|
76.2(3)
|
NC70-100
|
NC70
|
9140/9450
|
3308/3421
|
|
11
|
279.4
|
76.2(3)
|
8-5/8REG
|
8-5/8REG
|
9140/9450
|
4072/4210
|
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