Specifications
1. API Spiral collar2.provide bit weight to drill bit so that drill pipe is in tension
3.full size
4.best service
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 Spec7—1 and Standard SY/T5144
OD |
Cutting depth | ±25.4 Lead | ||
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 |
101.6-111.1 | 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 | 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 |
