倒扣接头
倒扣接头在处理卡钻事故的倒扣作业中可代替公锥。打捞或倒扣时，若落鱼被卡或倒不开，可从倒扣接头处退开，起出打捞钻具。
Reversing Sub
Reversing Sub is also called reversing spear which is a special tool for revering stuck drill stem above
stuck point in drilling and work over operation. In treatment of stuck drill stem, it can work as a fishing pin
tap in reversing operation.When fish is stuck or can not be reversed in fishing or reversing operation,the
fish can be reversed from reversing sub and the fishing drill tool can be tripped b can be replaced
taper tap in back-off operation while dealing with stuck accident.
倒扣接头规格参数
Specificati*** of Back Off Sub
|
型号 Type |
外径O.D. (mm) |
接头螺纹(左旋螺纹) Joint Thread (Left-hand Thread) |
打捞螺纹(右旋螺纹) Fishing Thread (Right-hand thread) |
抗拉强度 (千牛) Tensile Strength |
抗扭强度 (千牛/米) Torsional Strength |
|
DJT105 |
105 |
2 7/8IF |
2 7/8″IF |
500 |
9 |
|
DJT121 |
120 |
NC38 |
NC38 |
900 |
15 |
|
DJT159 |
159 |
NC50 |
NC50 |
1500 |
35 |
|
DJT165 |
165 |
NC50 |
NC56 5-1/2FH |
1900 |
45 |
|
DJT178 |
178 |
5 1/2″FH、NC50 |
5 1/2″FH NC50 |
2000 |
50 |
|
DJT197 |
197 |
6 5/8″ REC |
6 5/8 ″REC |
2500 |
65 |