Structure Features

Gas-tight premium connection for the deep, high deviated and horizontal well, ISO 13679 CALIV approved.

Excellent resistance to bending, compression and torque

Superior anti-galling performance

Reliable gas-tight sealing under any kind of combined loads

Especially suitable for highly deviated and long horizontal wells

Suitable for high alloy & carbon steel pipes

Hooked Thread

TBG: 2-3/8in~2-7/8in: 8T.P.I

3-1/2in~4-1/2in: 6T.P.I

CSG: 5in~8-5/8in: 5T.P.I

9-5/8in~20in: 4T.P.I

Large angle Metal-to-Metal seal, Reverse angle torque shoulder, Internal flush


Threaded Connection

A modified hook thread profile with 4º reverse angle on the load flank, which provide the connection with superior tension strength and increase its resistance to compression.

Metal-to-Metal Seal

Large angle metal-to-metal seal system offers excellent gas-tight sealing, even under the most severe combined loads. The seal integrity remains constant after repeated make-ups and break-outs.

Reverse Angle Torque Shoulder

A reverse angle torque shoulder provides a positive torque stop which allows for accurate power-tight make-up and minimizes hoop stresses in the connection.

Streamlined Internal Profile

A pin ID chamfer, tight tolerances on the coupling center combined with a long shoulder will minimize turbulence and energy loss inside the connection for high-velocity gas flows.

Coupling Design

The design owns 100% efficient connection performances.

Connection Low Stress Design

Connection low stress design can ensure that it can be safe under corrosive environment.