Spiral drill collar
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 SY5144.
|
O.D. |
Cuttingdepth |
Lead+-25.4 |
||
|
(mm) |
(in) |
A(mm) |
B(mm) |
(mm) |
|
86 |
33/8 |
3.5+-0.79 |
679 |
|
|
98.4 |
37/8 |
4.0+-0.79 |
914 |
|
|
101.6~111.1 |
4~41/8 |
4.8+-0.79 |
914 |
|
|
114.3~130.2 |
41/2~51/8 |
5.6+-0.79 |
965 |
|
|
133.4~146.1 |
51/4~53/4 |
6.4+-0.79 |
1067 |
|
|
149.2~161.9 |
57/8~63/8 |
7.1+-1.59 |
1067 |
|
|
165.1~177.8 |
61/2~7 |
7.9+-1.59 |
1168 |
|
|
181.0~200.0 |
71/8~77/8 |
8.7+-1.59 |
5.6+-0.79 |
1626 |
|
203.2~225.4 |
8~87/8 |
9.5+-1.59 |
6.4+-0.79 |
1727 |
|
228.6~250.8 |
9~97/8 |
10.3+-2.37 |
7.1+-1.59 |
1829 |
|
254.0~276.2 |
10~107/8 |
11.1+-2.37 |
7.9+-1.59 |
1930 |
|
279.4 |
11 |
11.9+-2.37 |
8.7+-1.59 |
2032 |
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