AJ type safety joint is a specialized joint consisting of two parts . The specialized joint takes protective effect for drilling stem in drilling , repairing and test oil (gas) engineering etc . It is used to treat well bottom accident and used to be on the way test in drilling and coring operation. It is connected to the required position of drilling stem to protect drilling stem without any influence on the normal working of drilling tool .
Technical parameters and specifications
| Type |
O.D.(mm) |
Thread connection |
I.D.(mm) |
Tensile yield
load(KN) |
Allowed Torque
(N・m) |
| AJ86(3 3/8") |
86 |
NC26(2 3/8IF) |
32 |
1395 |
9200 |
| AJ95(3 3/4") |
95 |
2 7/8REG |
32 |
1536 |
12100 |
| AJ105(4 1/8") |
105 |
NC31(2 7/8IF) |
44 |
2205 |
17900 |
| AJ121(4 3/4") |
121 |
NC38(3 1/2IF) |
54 |
2612 |
24500 |
| AJ146(5 3/4") |
146 |
NC40 |
71 |
3802 |
46200 |
| AJ159(6 1/4") |
159 |
NC50(4 1/2IF) |
76 |
4938 |
60600 |
| AJ178(7") |
178 |
NC50(4 1/2IF) |
76 |
5568 |
76300 |
| AJ203(8") |
203 |
6 5/8REG |
83 |
6445 |
100600 |
| AJ229(9") |
229 |
7 5/8REG |
83 |
7245 |
100600 | |
