Bit O.D.(in |
O.D. (mm) |
End O.D (mm) |
I.D. (mm) |
Length(mm) |
Connection |
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Short Type |
Long Type |
Drill string |
Near bit |
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Near bit |
Drill string |
Near bit |
Drill string |
Top |
Down |
Top |
Down |
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6 |
152.4 |
121 |
51 |
800 ~900 |
1,000 ~1,100 |
1,200 ~1,400 |
1,400 ~1,600 |
NC 38 |
NC 38 |
NC 38 |
3-1/2 REG |
6-1/4 |
158.7 |
||||||||||
6-1/2 |
165.1 |
||||||||||
7-1/2 |
190.5 |
159 165 178 |
57 71 |
1,000 |
1,600 |
1,800 |
NC 46 |
NC 46 |
NC 46 |
4-1/2 REG |
|
7-7/8 |
200.0 |
||||||||||
8 -3/8 |
212.7 |
1,000 ~1,200 |
1,600 ~1,800 |
1,800~ 2,000 |
NC46 NC50 |
4-1/2 REG |
|||||
8 -1/2 |
215.9 |
||||||||||
8-3/4 |
222.2 |
||||||||||
9-1/2 |
241.3 |
178 197 |
71 |
800 ~1,000 |
1,000 ~1,200 |
1,600 ~1,800 |
NC 50 |
NC 50 |
NC 50 |
6-5/8 REG |
|
9-5/8 |
244.5 |
||||||||||
9-7/8 |
250.8 |
||||||||||
12-1/4 |
311.2 |
203 229 |
76 |
1,000 ~1,200 |
1,200 1,500 |
1,800 2,000 |
NC56 6-5/8 REG |
6-5/8 REG |
|||
17-1/2 |
444.5 |
1,200 ~1,300 |
1,200 ~1,300 |
2,000 ~2,200 |
2,000~ 2,200 |
NC61 7-5/8 REG |