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Releasing Back off Spear for Oil and Gas Well RepairingReleasing back off spear is used for fishing, back off and releasing the fish. It can catch and transmit left hand torque during back off. It can
Releasing back off spear is used for fishing, back off and releasing the fish. It can catch and transmit left hand torque during back off. It can instead of left hand taper taps and die collars. The function is similar to back off sub. The difference is that it doesn’t’t need to make up thread with fish and catch at any part internally.
Size (inch) | Fishing ID | Tensile Load | Initial Pulling Force and Relevant Torque | Connection | |
Pulling Force (KN) | Torque (N·M) | ||||
2 3/8 | 50.8 (2) | 330 | 147 | 4313 | 2 7/8REG |
2 7/8 | 57.4 (2 1/4) | 500 | 166 | 5799 | NC31 |
62 (2 7/16) | |||||
69.9 (2 3/4) | |||||
74.2 (2 59/64) | |||||
76.2 (3) | |||||
77.9 (3 3/64) | |||||
3 1/2 | 76 (3) | 650 | 166 | 9593 | NC31 |
77.9 (3 3/64) | |||||
84.8 (3 11/32) | |||||
88.3 (3 31/64) | |||||
90.1 (3 35/64) | |||||
4 1/2 | 97.2 (3 53/64) | 850 | 196 | 11522 | 4 1/2REG |
99.6 (3 59/64) | |||||
101.6 (4) | |||||
102.8 (4 3/64) | |||||
103.6 (4 5/64) | |||||
5 | 108.7 (4 9/32) | 860 | 196 | 12320 | 4 1/2REG |
112 (4 13/32) | |||||
114.1 (4 1/2) | |||||
115.8 (4 9/16) | |||||
5 1/2 | 118.6 (4 43/64) | 880 | 196 | 13263 | NC50 |
5 1/2 | 121.4 (4 3/4) | ||||
124.3 (4 57/64) | |||||
125.7 (4 61/64) | |||||
127.3 (5 1/64) | |||||
