Yoshiyasu Morita

Calculation Method of Make-up Torque of Premium Connections for Oil or Gas Wells.

The making-up process of the premium connections for oil or gas wells is generally controlled by the recommended make-up torque. In order to determine the recommended torque, an analysis method for the make-up torque with short computing time and good accuracy is required. In this paper, so as to obtain the contact load at the metal-sealed portion of the connection, the connection model of combined cylindrical shells was analyzed, considering the shrink-fit values at the threaded portion and the metal-sealed one of the connection. Then, the calculation method of the make-up torque just before the contact of the torque shoulder was obtained. As the torques calculated by the calculation method agreed well with those by FEM and actual tests, this method can be applied to determine the make-up torque of premium connections.