Premium Connection for Casing and Tubing

Thread Parameters	Tubing		Casing
	2 3/8〞to 2 7/8〞	3 1/2〞to 4 1/2〞	5〞and above
Taper	1:16
Thread Pitch	8 TPI	6 TPI	5 TPI

Advantages:

• The connection with standard coupling can reach to the strength of pipe body.
• High seal reliability, it can provide a considerable internal pressure resistance with the pipe body.
• Anti galling design
• Minimum energy losing

ZC-2 Premium Connection

Tubing main seal is a taper metal to metal seal (50% taper on diameter), which can offer excellent gas tightness even under the most severe combined loads, as encountered in deviated or long horizontal wells applications. Sealing integrity remains constant despite repeated make-ups and break-outs and protects against galling. Casing main seal is a 20o angle taper metal to metal seal, which provides gas tightness under combined loads.
 

Thread Parameters	Tubing		Casing
	2 3/8〞to 2 7/8〞	3 1/2〞to 4 1/2〞	5〞to 7 5/8〞	8 5/8〞and above
Taper	1:16
Thread Pitch	8 TPI	6 TPI	5 TPI	4 TPI

Advantages:

• Excellent against bending / compressive and torsion properties
• Reliable gas-tightness under any combination load
• Easy to use and maintenance

ZC-3 Premium Connection

It is integral connection threaded on plain-end pipe with the OD of the connection totally flush with the pope body. Sizes range from 2 3/8〞to 11 7/8〞for such clearance applications as tubing in small sizes, drilling liners and tie-backs in medium sizes, and contingency liner in larger casing diameters.
 

Thread Parameters	tubing	casing
	2 3/8〞to 4 1/2〞	5〞and above
Taper	1:16	1:10
Thread Pitch	6TPI

Advantages:

• Excellent gas-tight sealing
• With maximum clearance （100% plush with pipe body）
• Easy to use and maintenance

ZC-4 Premium Connection

The external and internal thread is machined directly in the pipe without coupling. Joint is used internal and external upset. Taper metal-to-metal internal pressure seal is rated at 100% of the pipe body. The 100% external pressure seal is created at the torque shoulder. ZC-4 has the external and internal sealing capability, which can reach same performance with pipe body.
 

Thread Parameters	Specification
	2 3/8〞to 4 1/2〞
Thread from	Cylindrical thread form
Thread Pitch	6TPI

Advantages:

• Strongly anti galling performance, longer using life 
• Excellent resistance to H2S stresses corrosion.
• Better sealing performance
• Quickly speed of making up
• The thread connection strength is same with pipe body.
• High anti torque strength, high anti bending and strongly anti compression abilities.

ZC-5 Premium Connection

Joint end is used internal and external upset. The internal and external thread is machined directly in the pipe without coupling. And the thread connection strength is same with pipe body.
It used double screw with no interference and multi torque shoulder, which provides excellent gas tightness and strongly anti galling performance. With 7.5°angle on the flank and 45°angle on the stab flank, there is no radial interference between the inner and outer thread. Taper metal-to-metal internal pressure seal is rated at 100% of the pipe body.
 

Thread Parameters	Specification
	2 3/8〞to 5〞	5 1/2〞to 7〞
Thread form	Cylindrical thread form
Thread Pitch	8 TPI	4TPI

Advantages:

• Strongly anti galling performance
• Excellent resistance to H2S stress corrosion
• With double seal capability in the external and internal
• High anti torque strength, high anti bending and strongly anti compression abilities

ZC-6 Premium Connection

The external and internal thread is machined directly in the pipe without coupling. Joint is used internal and external upset.Taper metal-to-metal internal pressure seal is rated at 100% of the pipe body. The 100% external pressure seal is created at the torque shoulder. ZC-6 has the external and internal sealing capability, which can reach same performance with pipe body.
 

Thread Parameters	Specification
	2 3/8〞to 4 1/2〞
Thread from	Cylindrical thread form
Thread Pitch	4TPI

Advantages:

• Strongly anti galling performance, longer using life
• Excellent resistance to H2S stresses corrosion.
• Better sealing performance
• The thread connection strength is same with pipe body.
• High anti torque strength, high anti bending and strongly anti compression abilities.