Features of TT type double shoulder threaded connection:
1. Higher torsional strength and bending stiffness
2. Even distribution of force on the threads
3. Tool joints with double shoulder threaded connections are more rigid, stronger and has greater torque capacity
4. Smooth transition between the pin and box threaded connections, creates a streamlined ID profile. This allows smoother fluid flow during drilling with minimized turbulence, improving the hydraulic performance, minimizing thread erosion and reducing drill collar failure
5. Excellent sealing performance
Features of THDS type double shoulder threaded connection:
1. High torsional resistance
2. Interchangeable with API connections of comparable sizes
3. Excellent sealing performance
4. Minimize pressure loss