Spiral drill collar is used to reduce contact area with hole so as to avoid efficiently bit sticking from differential pressur
Spiral drill collar is used to reduce contact area with hole so as to avoid efficiently bit sticking from differential pressure. spiral drill collars are manufactured strictly according to API Spec.7 and Standard SY5144, all mechanical properties meet with above standards.
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Sizes for drill collar spiral groove.........
O.D. | Cutting depth | Lead±25.4 | ||
Mm | in | A(mm) | B(mm) | mm |
86 | 3 3/8 | 3.5±0.79 |
| 679 |
98.4 | 3 7/8 | 4.0±0.79 |
| 914 |
101.6111.1 | 44 1/8 | 4.8±0.79 |
| 914 |
114.3130.2 | 4 1/25 1/8 | 5.6±0.79 |
| 965 |
133.4146.1 | 5 1/45 3/4 | 6.4±0.79 |
| 1067 |
149.2161.9 | 5 7/86 3/8 | 7.1±1.59 |
| 1067 |
165.1177.8 | 6 1/27 | 7.9±1.59 |
| 1168 |
181.0200.0 | 7 1/87 7/8 | 8.7±1.59 | 5.6±0.79 | 1626 |
203.2225.4 | 88 7/8 | 9.5±1.59 | 6.4±0.79 | 1727 |
228.6250.8 | 99 7/8 | 10.3±2.37 | 7.1±1.59 | 1829 |
254.0276.2 | 1010 7/8 | 11.1±2.37 | 7.9±1.59 | 1930 |
279.4 | 11 | 11.9±2.37 | 8.7±1.59 | 2032 |
