Double Shoulder

Comparison between JSHDS and API tool joint

mprove drilling fluid flow flatness to reduce the flow instability.

Reduce the impact abrasion of mud and stone powder to tool joint 

Improve the working efficiency of pump

API thread,   exposed in the mud with impact and corrosion ,  easy to form a sharp notch,   intensifying  the stress concentration.  

Characteristic of double shoulder connection

• Compatible with API digital connection

• Compatible with other double shoulder connection

• Flush ID

• Allow greater torque ,   improve torsion performance,   30% -50% increased  of torque based on common thread

• Smaller OD and larger ID can significantly  decrease water loss along the drill string which significantly improve torsion performance and increase the OD wear allowance.

(API  NC与JSHDS)

(API  NC与 JSHDS)