B - Operations – Transporting – 25 – B
Patent
B - Operations, Transporting
25
B
B25B 13/50 (2006.01) E21B 19/16 (2006.01)
Patent
CA 2381549
Tongs for assembling sucker rods of oil wells include a switch that senses movement of the tong's backup wrench relative to the tong's housing. When screwing two sucker rods into a threaded coupling, an upper jaw of the tongs rotates an upper sucker rod relative to a lower sucker rod, while the backup wrench holds the lower rod relatively stationary. When the tongs apply a torque that indicates that the threaded connection is beyond hand tight (i.e., at the shoulder point), a torque reaction force kicks the backup wrench to a position that trips the switch. A control responsive to the switch and a rotation sensor monitors and/or controls the threaded connection's circumferential displacement past the shoulder point. By sensing the position of the backup wrench directly, the switch can consistently identify the shoulder point independent of the tong's hydraulic pressure, thus avoiding oil viscosity related errors.
Key Energy Services Inc.
Newman Frederic M.
LandOfFree
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