| Customization: | Available |
|---|---|
| Color: | Black |
| Usage: | Petroleum Coke |
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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. Double Top Structure:
drill pipr joints adopt the double ledge(double top)structure, such structure can enhance the tightness of joints so that the pressure of the mud could realize non-leakage half way. greatly reduce the resistance to polit drilling and back using this sturcture improves the torional strength of drill pipr so that the box thread will not deformed
2. After optimal design of equal strength and the dispersion of stress to give dull play to the potiontioal of the drill pipr matrial.
3. After forging joints materials, increased matrial density and change the material of fibrous tissue, thereby enhancing its machanical properties.
4.Using joints nitride, phonsphide or copper treatment to ensure thread anti- corrosion, anti-stick, and improve joint surface fatigue resisitance.
5. Unsetting& thickening to the tube, improvinig the metallurgical structure and enhancing the impact toughness, ensuring comprehansive mechanical properties and the friction weld seals not be broken.
|
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
|
|
6152.4
|
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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