| After-sales Service: | Provided |
|---|---|
| Warranty: | 1 Year or 2000hours |
| Manufacturing Process: | Casting |
| Surface Treatment: | Sand Blast |
| Operation Pressure: | Vacuum |
| Material: | Cast Steel |
| Customization: |
|---|
Suppliers with verified business licenses
Product application
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.
Features
(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 |
O.D. |
I.D. |
Length |
Diameter of shoulder guide Angle |
Reference bending strength ratio |
|||
|
mm |
inch |
mm |
inch |
mm |
inch |
|||
|
NC23-31 |
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. |
cutting depth |
Lead ±25.4 |
||
|
mm |
in |
A(mm) |
B(mm) |
mm |
|
86 |
3.375 |
3.5±0.79 |
/ |
679 |
|
98.4 |
3.875 |
4.0±0.79 |
/ |
914 |
|
101.6~111.1 |
4~4 1/8 |
4.8±0.79 |
/ |
914 |
|
114.3~130.2 |
4 1/2~5 1/8 |
5.6±0.79 |
/ |
965 |
|
133.4~146.1 |
5 1/4~5 3/4 |
6.4±0.79 |
/ |
1067 |
|
149.2~161.9 |
5 7/8~6 3/8 |
7.1±1.59 |
/ |
1067 |
|
165.1~177.8 |
6 1/2~7 |
7.9±1.59 |
/ |
1168 |
|
181.0~200.0 |
7 1/8~7 7/8 |
8.7±1.59 |
5.6±0.79 |
1626 |
|
203.2~225.4 |
8~8 7/8 |
9.5±1.59 |
6.4±0.79 |
1727 |
|
228.6~250.8 |
9~9 7/8 |
10.3±2.37 |
7.1±1.59 |
1829 |
|
254.0~276.2 |
10~10 7/8 |
11.1±2.37 |
7.9±1.59 |
1930 |
|
279.4 |
11 |
11.9±2.37 |
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.
Sreel Mark |
Chemical Composition % |
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|
C |
Si |
Mn |
P |
S |
Cr |
Mo |
Cu |
Al |
|
|
4145H |
0.42~0.48 |
0.15~0.35 |
0.90~1.20 |
≤0.03 |
≤0.03 |
0.90~1.20 |
0.15~0.25 |
≤0.2 |
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 |
Yield Strength |
Tensile Strength |
Elongation |
|
Charpy Impact |
|||
|
mm |
in |
MPa |
Psi |
MPa |
Psi |
|||
|
79.4~171.4 |
3-1/8~6-3/4 |
≥758 |
≥110000 |
≥965 |
≥140000 |
≥13 |
285~341 |
≥54 |
|
177.8~279.4 |
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 |
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 |
127.0 |
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≥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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Suppliers with verified business licenses
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