Make-Up Torque
Part of the strength of the drillstring and the seal for the fluid conduit are
both contained in the tool joints. It is very important therefore, that the
correct make-up torque is applied to the tool joints. If a tool joint is not
torqued enough, bending between the box and pin could cause premature
failure. Also, the shoulder seal may not be properly seated, resulting in
mud leaking through the tool joint, causing a washout. Exceeding the
torsional yield strength of the connection by applying too much torque to
the tool joint could cause the shoulders to bevel outward or the pin to break
off the box. Recommended make up torques for drill pipe and tool joints
are listed in the API RP 7G.
Part of the strength of the drillstring and the seal for the fluid conduit are
both contained in the tool joints. It is very important therefore, that the
correct make-up torque is applied to the tool joints. If a tool joint is not
torqued enough, bending between the box and pin could cause premature
failure. Also, the shoulder seal may not be properly seated, resulting in
mud leaking through the tool joint, causing a washout. Exceeding the
torsional yield strength of the connection by applying too much torque to
the tool joint could cause the shoulders to bevel outward or the pin to break
off the box. Recommended make up torques for drill pipe and tool joints
are listed in the API RP 7G.
