round drill collar
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 |
Length |
Diameter of shoulder guide Angle |
Reference bending strength ratio |
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|
mm |
inch |
mm |
inch |
mm |
inch |
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|
NC23-31 |
31/8 |
11/4 |
9150 |
30ft |
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NC26-35(23/8IF) |
31/2 |
11/2 |
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NC31-41(27/8IF) |
41/8 |
2 |
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NC35-47 |
43/4 |
2 |
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NC38-50(31/2IF) |
127 |
5 |
21/4 |
121 |
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NC44-60 |
6 |
21/4 |
9150or9450 |
30ftor31ft |
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NC44-60 |
6 |
213/16 |
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NC44-62 |
61/4 |
21/4 |
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NC46-62(4IF) |
61/4 |
213/16 |
150 |
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NC46-65(4IF) |
61/2 |
21/4 |
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NC46-65(4IF) |
61/2 |
213/16 |
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NC46-67(4IF) |
63/4 |
21/4 |
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NC50-67(41/2IF) |
63/4 |
213/16 |
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NC50-70(41/2IF) |
7 |
21/4 |
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NC50-70(41/2IF) |
7 |
213/16 |
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NC50-72(41/2IF) |
71/4 |
213/16 |
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NC56-77 |
73/4 |
213/16 |
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NC56-80 |
8 |
213/16 |
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65/8REG |
81/4 |
213/16 |
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NC61-90 |
9 |
213/16 |
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75/8REG |
91/2 |
3 |
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NC70-97 |
93/4 |
3 |
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NC70-100 |
254 |
10 |
3 |
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85/8REG |
11 |
3 |
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Note: 1.Drill collar thread type: NC-Digital IF-Internal flat type REG-Normal type |
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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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cutting depth |
Lead ±25.4 |
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mm |
in |
A(mm) |
B(mm) |
mm |
|
86 |
679 |
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|
914 |
||||
|
4～4 1/8 |
914 |
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4 1/2～5 1/8 |
965 |
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5 1/4～5 3/4 |
1067 |
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5 7/8～6 3/8 |
1067 |
|||
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6 1/2～7 |
1168 |
|||
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7 1/8～7 7/8 |
1626 |
|||
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8～8 7/8 |
1727 |
|||
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9～9 7/8 |
1829 |
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10～10 7/8 |
1930 |
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|
11 |
2032 |
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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 |
Chemical Composition % |
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C |
Si |
Mn |
P |
S |
Cr |
Mo |
Cu |
Al |
|
|
4145H |
≤0.03 |
≤0.03 |
≤0.2 |
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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 |
Yield Strength |
Tensile Strength |
ElongationA% |
HB |
Charpy ImpactAkv J |
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|
mm |
in |
MPa |
Psi |
MPa |
Psi |
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|
3-1/8～6-3/4 |
≥758 |
≥110000 |
≥965 |
≥140000 |
≥13 |
285～341 |
≥54 |
|
|
7～11 |
≥689 |
≥100000 |
≥930 |
≥135000 |
≥13 |
285～341 |
≥54 |
|
|
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 |
Code |
Thread |
Length（mm） |
Weight（kg） |
||
|
3-1/8 |
NC23-31 |
NC23 |
9140 |
298 |
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3-1/2 |
NC26-35 |
NC26 |
9140 |
364 |
||
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4-1/8 |
NC31-41 |
NC31 |
9140/9450 |
474/490 |
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4-3/4 |
NC35-47 |
NC35 |
9140/9450 |
674/697 |
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5 |
NC38-50 |
NC38 |
9140/9450 |
725/749 |
||
|
6 |
NC44-60 |
NC44 |
9140/9450 |
1125/1163 |
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NC44-60 |
9140/9450 |
1022/1056 |
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6-1/4 |
NC44-62 |
NC44 |
9140/9450 |
1237/1279 |
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NC46-62 |
9140/9450 |
1134/1172 |
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|
6-1/2 |
NC46-65 |
NC46 |
9140/9450 |
1352/1398 |
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|
NC46-65 |
NC50 |
9140/9450 |
1249/1291 |
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6-3/4 |
NC46-67 |
NC46 |
9140/9450 |
1471/1521 |
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|
7 |
NC50-70 |
NC50 |
9140/9450 |
1597/1651 |
||
|
NC50-70 |
9140/9450 |
1494/1545 |
||||
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7-1/4 |
NC50-72 |
NC50 |
9140/9450 |
1625/1680 |
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7-3/4 |
NC56-77 |
NC56 |
9140/9450 |
1895/1960 |
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8 |
NC56-80 |
NC56/6-5/8REG |
9140/9450 |
2040/2109 |
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8-1/4 |
6-5/8REG |
6-5/8REG |
9140/9450 |
2188/2263 |
||
|
9 |
NC61-90 |
NC61 |
9140/9450 |
2658/2748 |
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|
9-1/2 |
7-5/8REG |
7-5/8REG |
9140/9450 |
2954/3054 |
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|
9-3/4 |
NC70-97 |
NC70 |
9140/9450 |
3127/3234 |
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|
10 |
NC70-100 |
NC70 |
9140/9450 |
3308/3421 |
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|
11 |
8-5/8REG |
8-5/8REG |
9140/9450 |
4072/4210 |
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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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