Torque hold system and method

Details Torque hold system and method Torque hold system and method

B - Operations, Transporting

25

B

81/34

B25B 23/14 (2006.01) B25B 23/145 (2006.01) E21B 19/16 (2006.01)

Patent

CA 1319543

-18- Abstract of the Disclosure Hydraulic tongs, used to screw oilfield tubulars together, are equipped with torque control means which enable the tongs to rotate the tubulars and then gradually apply torque until a preselected torque value is reached, hold the torque at this value a desired period of time and then release the torque. In one form of the invention, a tong control restricts the power of the tong motor to enable low torque rotation while limiting the maximum torque which can be produced by the tong motor. A hydraulic cylinder placed in the tongs' restraining line is controlled to shorten, hold or extend the line. When the line is shortened, the tongs are pulled in a direction which increases the torque to a value above the maximum torque produced by the tong motor. The system allows heavy, powerful tongs to be used to accurately apply and hold a wide variety of selected torque values.

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