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用于使套管居中，扶正器肋筋上的滚轮在下入套管时可以滚动，减少下入阻力
| 套管规格in | 井眼尺寸in | 最大外径 | |
| mm | in | ||
| 4-1/2 | 6 | 148 | 5.827 |
| 5 | 6 | 150 | 5.9 |
| 5 | 6-1/2 | 163 | 6.417 |
| 5-1/2 | 8-1/2 | 212 | 8.346 |
| 6-5/8 | 8-1/2 | 213 | 8.386 |
| 7 | 8-1/2 | 213 | 8.386 |
| 7 | 9-1/2 | 240 | 9.449 |
| 7-5/8 | 9-1/2 | 240 | 9.449 |
| 7-5/8 | 10-3/4 | 250 | 9.842 |
| 9-5/8 | 12-1/4 | 308 | 12.126 |
| 9-7/8 | 12-1/4 | 308 | 12.126 |
| 10-1/4 | 12-1/4 | 308 | 12.126 |
| 10-3/4 | 12-1/4 | 308 | 12.126 |
| 10-3/4 | 13-1/8 | 330 | 12.992 |
| 13-3/8 | 16 | 400 | 15.748 |
| 13-3/8 | 17-1/2 | 438 | 17.244 |
| 13-5/8 | 17-1/2 | 445 | 17.52 |
用于使套管居中，扶正器肋筋上的滚轮在下入套管时可以滚动，减少下入阻力
| 套管规格in | 井眼尺寸in | 最大外径 | |
| mm | in | ||
| 4-1/2 | 6 | 148 | 5.827 |
| 5 | 6 | 150 | 5.9 |
| 5 | 6-1/2 | 163 | 6.417 |
| 5-1/2 | 8-1/2 | 212 | 8.346 |
| 6-5/8 | 8-1/2 | 213 | 8.386 |
| 7 | 8-1/2 | 213 | 8.386 |
| 7 | 9-1/2 | 240 | 9.449 |
| 7-5/8 | 9-1/2 | 240 | 9.449 |
| 7-5/8 | 10-3/4 | 250 | 9.842 |
| 9-5/8 | 12-1/4 | 308 | 12.126 |
| 9-7/8 | 12-1/4 | 308 | 12.126 |
| 10-1/4 | 12-1/4 | 308 | 12.126 |
| 10-3/4 | 12-1/4 | 308 | 12.126 |
| 10-3/4 | 13-1/8 | 330 | 12.992 |
| 13-3/8 | 16 | 400 | 15.748 |
| 13-3/8 | 17-1/2 | 438 | 17.244 |
| 13-5/8 | 17-1/2 | 445 | 17.52 |
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