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Downhole Fishing Tool Back-off Sub/Back-off SpearBack-off sub is also called back-off spear. Back-off sub can replace taper tap in back-off operation while dealing with stuck accident. When fishing or
Back-off sub is also called back-off spear. Back-off sub can replace taper tap in back-off operation while dealing with stuck accident. When fishing or backing off, if fish is stuck or cannot back-off, it can be withdrawn at the back off sub, and lifts out fishing drill tool.
OD | Connection | ID | OAL |
105 (4 1/8) | NC31B LH×NC31P | 15 (19/32) | 580 (22 13/16) |
121 (4 3/4) | NC38B LH×NC38P | 22 (57/64) | 628 (24 3/4) |
159 (6 1/4) | NC50B LH×NC50P | 28 (1 1/8) | 690 (27 3/16) |
165 (6 1/2) | NC50B LH×NC50P | 28 (1 1/8) | 690 (27 3/16) |
168 (6 5/8) | NC50B LH×NC50P | 28 (1 1/8) | 690 (27 3/16) |
178 (7) | 6 5/8REGB LH×6 5/8REP | 32 (1 1/4) | 700 (27 9/16) |
203 (8) | 6 5/8REGB LH×6 5/8REP | 35 (1 3/8) | 723 (28 1/2) |
