|
Outside diameter |
Depth of cut A |
Spiral pitch ±25.4 |
Depth of cut B |
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|
mm |
in |
mm |
mm |
mm |
||
|
98.4 |
3 7/8 |
4.0±0.79 |
914 |
|
||
|
101.6～111.1 |
4～4 3/8 |
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 |
1626 |
5.6±0.79 |
||
|
203.2～225.4 |
8～8 7/8 |
9.5±1.59 |
1727 |
6.4±0.79 |
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|
228.6～250.8 |
9～9 7/8 |
10.3±2.37 |
1829 |
7.1±1.59 |
||
|
254.0～276.2 |
10～10 7/8 |
11.1±2.37 |
1930 |
7.9±1.59 |
||
|
279.4 |
11 |
11.9±2.37 |
2032 |
8.7±1.59 |
||
|
|
|||||
|
Figure 1. Spiral drill collar type BⅠ |
Figure 2. Spiral drill collar type BⅠ |
|||||
|
Outside diameter |
Depth of cut (Max.) |
Spiral pitch ±25.4 |
|
|||
|
mm |
in |
mm |
mm |
|
||
|
120.7 |
4 3/4 |
4.8 |
1000 |
|
||
|
155.6 |
6 1/8 |
6.4 |
||||
|
158.8 |
6 1/4 |
6.4 |
||||
|
171.5 |
6 3/4 |
7.1 |
||||
|
184.2 |
7 1/4 |
7.9 |
||||
|
190.5 |
7 1/2 |
7.9 |
||||
|
196.9 |
7 3/4 |
7.9 |
||||
|
203.2 |
8 |
9.5 |
|
|
||
|
209.6 |
8 1/4 |
9.5 |
||||
|
215.9 |
8 1/2 |
9.5 |
||||
|
228.6 |
9 |
9.5 |
||||
|
241.3 |
9 1/2 |
11.9 |
||||
|
254.0 |
10 |
11.9 |
||||
|
Note: BⅡ Style Drill Collar, 3 Spiral Grooves, right-hand, well-distributed. ρ= R-e(1-cos3)
|
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|
|
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|
Figure 2. Spiral drill collar type BⅡ |
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