CSC Production Square Kelly and Hexagonal Kelly
Kelly is located in the top of the drill string, with square and hexagonal. In rotary drilling, when it's drilling, kelly connected with square bushing and rotary bushing, transfer the ground rotary torque to drill pipe and to drive the drill bit, bearing the weight of drill string. In the drilling of the turbine and drilling motor, the weight of drill string and the counter torque are supported.
Introduction
Continental Steel Co.,Ltd(CSC) could provide square kelly and hexagonal kelly which is manufactured strictly according to API Spec7-1 standard. Material from AISI 4145H modified, fully heat treated alloy steel with Brinell hardness range of 285-341 and a minimum Charpy impact of 40 ft-lbs. Kelly bars are ultrasonically inspected over full length and section.
Parameter Table
| Size(in) |
Top Connection(LH) |
Bottom Connection |
I.D. (in) |
Drive Section (in) |
| Standard O.D.(in) |
Optional O.D.(in) |
Square O.D.(in) |
Hex. O.D.(in) |
Square |
Hex. |
A |
B |
| 2-1/2 |
6-5/8REG 7-3/4 |
4-1/2REG 5-3/4 |
NC26 |
/ |
1-1/4 |
/ |
3-2/7 |
/ |
| 3 |
6-5/8 REG 7-3/4 |
4-1/2REG 5-3/4 |
NC31 4-1/8 |
NC26 3-3/8 |
1-3/4 |
1-1/4 |
4 |
3-3/8 |
| 3-1/2 |
6-5/8 REG 7-3/4 |
4-1/2REG 5-3/4 |
NC38 4-3/4 |
NC31 4-1/8 |
2-1/4 |
1-3/4 |
4-1/2 |
4 |
| 4-1/4 |
6-5/8REG 7-3/4 |
4-1/2REG 5-3/4 |
NC46 6-1/4 |
NC38 4-3/4 |
2-4/5 |
2-1/4 |
5-4/7 |
4-4/5 |
| 6-5/8 REG 7-3/4 |
4-1/2REG 5-3/4 |
NC50 6-3/8 |
NC38 4-3/4 |
2-4/5 |
2-1/4 |
5-4/7 |
4-4/5 |
| 5-1/4 |
6-5/8 REG 7-3/4 |
/ |
5-1/2FH 7 |
NC46 6-1/4 |
3-1/4 |
3 |
7 |
6 |
| 6-5/8 REG 7-3/4 |
/ |
NC56 7 |
NC50 6-3/8 |
3-1/4 |
3-1/4 |
7 |
6 |
| 6 |
6-5/8 REG 7-3/4 |
/ |
/ |
5-1/2FH 7 |
/ |
3-1/2 |
/ |
6-4/5 |
| 6-5/8 REG 7-3/4 |
/ |
/ |
NC56 7 |
/ |
3-1/2 |
/ |
6-4/5 |
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