Spiral Drill Collar is used to reduce contact area with hole so as to avoid efficiently bit sticking from differential pressure. TIANHE brand spiral drill collars are manufactured strictly according to API Spec7-1 and Standard SY5144.
Technical specifications and parameters
|
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 |
|
101.6~111.1 |
4~4 1/8 |
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 |
|
