round drill collar
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)Eccentric-weight drill collar is an effective anti-deviation drilling tool,with high drill pressure used in oblique areas,rectifying oblique as well.
(2)When drilling directional wells eccentric-weight drill collar is an effective tool to reduce oblique or straighten the well hole using high drilling pressure.
(3)Eccentric-weight drill collar has the advantages of simple structure,convenient use,connected directly to common drill collar without centralizers,greatly convenient for sinking in,fishing and milling operations.
(4)Eccentric-weight drill collar runs downhole safely,danger of leakage or bit freezing hard to appear.
(5)Pay much attention to avoid mud balling and prevent effect of anti-deviation .
CHEMICAL COMPOSITION
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Drill Collar Specification
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Thread Type
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O.D.
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I.D.
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Length
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Diameter of shoulder guide Angle
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Reference bending strength ratio
|
|
mm
|
inch
|
mm
|
inch
|
mm
|
inch
|
|
NC23-31
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79.4
|
31/8
|
31.8
|
11/4
|
9150
|
30ft
|
76.2
|
2.57:1
|
|
NC26-35(23/8IF)
|
88.9
|
31/2
|
38.1
|
11/2
|
82.9
|
2.42:1
|
|
NC31-41(27/8IF)
|
104.8
|
41/8
|
50.8
|
2
|
100.4
|
2.43:1
|
|
NC35-47
|
120.7
|
43/4
|
50.8
|
2
|
114.7
|
2.58:1
|
|
NC38-50(31/2IF)
|
127
|
5
|
57.2
|
21/4
|
121
|
2.38:1
|
|
NC44-60
|
152.4
|
6
|
57.2
|
21/4
|
9150or9450
|
30ftor31ft
|
144.5
|
2.49:1
|
|
NC44-60
|
152.4
|
6
|
71.4
|
213/16
|
144.5
|
2.84:1
|
|
NC44-62
|
158.8
|
61/4
|
57.2
|
21/4
|
149.2
|
2.91:1
|
|
NC46-62(4IF)
|
158.8
|
61/4
|
71.4
|
213/16
|
150
|
2.63:1
|
|
NC46-65(4IF)
|
165.1
|
61/2
|
57.2
|
21/4
|
154.8
|
2.76:1
|
|
NC46-65(4IF)
|
165.1
|
61/2
|
71.4
|
213/16
|
154.8
|
3.05:1
|
|
NC46-67(4IF)
|
171.4
|
63/4
|
57.2
|
21/4
|
159.5
|
3.18:1
|
|
NC50-67(41/2IF)
|
171.4
|
63/4
|
71.4
|
213/16
|
159.5
|
2.37:1
|
|
NC50-70(41/2IF)
|
177.8
|
7
|
57.2
|
21/4
|
164.7
|
2.54:1
|
|
NC50-70(41/2IF)
|
177.8
|
7
|
71.4
|
213/16
|
164.7
|
2.37:1
|
|
NC50-72(41/2IF)
|
184.2
|
71/4
|
71.4
|
213/16
|
169.5
|
3.12:1
|
|
NC56-77
|
196.8
|
73/4
|
71.4
|
213/16
|
185.3
|
2.70:1
|
|
NC56-80
|
203.2
|
8
|
71.4
|
213/16
|
190.1
|
3.02:1
|
|
65/8REG
|
209.6
|
81/4
|
71.4
|
213/16
|
195.7
|
2.93:1
|
|
NC61-90
|
228.6
|
9
|
71.4
|
213/16
|
212.7
|
3.17:1
|
|
75/8REG
|
241.3
|
91/2
|
76.2
|
3
|
223.8
|
2.81:1
|
|
NC70-97
|
247.6
|
93/4
|
76.2
|
3
|
232.6
|
2.57:1
|
|
NC70-100
|
254
|
10
|
76.2
|
3
|
237.3
|
2.81:1
|
|
85/8REG
|
279.4
|
11
|
76.2
|
3
|
266.7
|
2.84:1
|
|
Note: 1.Drill collar thread type: NC-Digital IF-Internal flat type REG-Normal type
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|
2.Bending strength ratio: the ratio of the modulus of the cross section and the modulus of the cross section of the cross section of the dangerous section of the inner thread
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In addition, our company can produce the drill collar and spiral drill collar, which can also produce the special specifications of the drill collar and the high efficiency and wear-resisting lengthening drill collar
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O.D.
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cutting depth
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Lead ±25.4
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mm
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in
|
A(mm)
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B(mm)
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mm
|
|
86
|
3.375
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3.5±0.79
|
|
679
|
|
98.4
|
3.875
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4.0±0.79
|
|
914
|
|
101.6～111.1
|
4～4 1/8
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4.8±0.79
|
|
914
|
|
114.3～130.2
|
4 1/2～5 1/8
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5.6±0.79
|
|
965
|
|
133.4～146.1
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5 1/4～5 3/4
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6.4±0.79
|
|
1067
|
|
149.2～161.9
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5 7/8～6 3/8
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7.1±1.59
|
|
1067
|
|
165.1～177.8
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6 1/2～7
|
7.9±1.59
|
|
1168
|
|
181.0～200.0
|
7 1/8～7 7/8
|
8.7±1.59
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5.6±0.79
|
1626
|
|
203.2～225.4
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8～8 7/8
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9.5±1.59
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6.4±0.79
|
1727
|
|
228.6～250.8
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9～9 7/8
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10.3±2.37
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7.1±1.59
|
1829
|
|
254.0～276.2
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10～10 7/8
|
11.1±2.37
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7.9±1.59
|
1930
|
|
279.4
|
11
|
11.9±2.37
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8.7±1.59
|
2032
|
Advantages of Drill Collar Production Process:
In the process of heat treatment, the drill collar has added a special normalizing process, which makes the thread part grain more refined, enhances the drill collar thread strength, and effectively improves the service life of the drill collar.
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Sreel Mark
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Chemical Composition %
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C
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Si
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Mn
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P
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S
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Cr
|
Mo
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Cu
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Al
|
|
4145H
|
0.42～0.48
|
0.15～0.35
|
0.90～1.20
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≤0.03
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≤0.03
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0.90～1.20
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0.15～0.25
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≤0.2
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0.025～0.045
|
|
Other Elements：N≤0.015，Ni≤0.5
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Drill Collar Mechanical Performance
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|
Drill Collar Outside Diameter Range
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Yield Strength
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Tensile Strength
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Elongation
A%
|
HB
|
Charpy Impact
Akv J
|
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mm
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in
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MPa
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Psi
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MPa
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Psi
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79.4～171.4
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3-1/8～6-3/4
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≥758
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≥110000
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≥965
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≥140000
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≥13
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285～341
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≥54
|
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177.8～279.4
|
7～11
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≥689
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≥100000
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≥930
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≥135000
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≥13
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285～341
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≥54
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Under special conditions, the impact work of the charpy can be determined as greater than 70J according to the supply and demand
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|
Size
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O.D（mm）
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I.D.（mm）
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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
|
127.0
|
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
|
254.0
|
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
|
|
Mechanical properties：＜7 inch Drill Collar：Yield Strength≥758MPa，Tensile Strength≥965MPa，Four times elongation≥13%，Impact energy Ak≥54J,（Single impact work≥47J，Average≥54J）Hardness range 285HB～341HB≥7inch Drill Collar：Yield Strength度≥689MPa，Tensile Strength≥931MPa，Four times elongation≥13%，Impact energy Ak≥54J,（Single impact work≥47J，Average≥54J） Hardness range 285HB～341HB
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Found Petroleum Equipment Co., Ltd
Basic Information
Business Type:Business Service
Main Products:Sucker Rod,Drill Collar, Heavy Weight Drill Pipe
Location:
Total Employees: 268
Year Established: 2005
Trade Information
Top 3 Markets:
Accepted Payment Currency:
Nearest Port:
Average Lead Time:0
Overseas Office: No
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