Connecting Pipe, Pipe Joint, Pipe Clamp, Pipe Connector, Pipe Coupling, Pipe Connection Sleeve,pipe Connection Ring

### Product Introduction IV: Couplings

#### I. Product Overview

Couplings are a key component in oil country tubular goods (OCTG), used to connect casing and tubing. Their performance directly impacts the safety and efficiency of oil and gas extraction. Tianjin Longkai Lai Company produces couplings with advanced design concepts and manufacturing processes, ensuring high sealing performance and strength. Our couplings are widely used in both land-based and offshore oil and gas fields, meeting the demands of different well depths and geological conditions.

#### II. Outer Diameter Specifications

Tianjin Longkai Lai Company offers a variety of outer diameter specifications for couplings to meet the needs of different customers. Common specifications include:

- 2.375 inches (60.3mm)

- 2.875 inches (73.0mm)

- 3.5 inches (88.9mm)

- 4.0 inches (101.6mm)

- 4.5 inches (114.3mm)

These couplings are manufactured using advanced production processes to ensure precision in outer diameter and connection stability.

#### III. Yield Strength

Yield strength is a critical performance indicator for couplings, determining the maximum pressure they can withstand underground. Tianjin Longkai Lai Company's couplings offer a wide range of yield strengths to meet the needs of different extraction environments:

- J55 coupling: Minimum yield strength of 35,000 psi (241 MPa)

- N80 coupling: Minimum yield strength of 45,000 psi (310 MPa)

- P110 coupling: Minimum yield strength of 75,000 psi (517 MPa)

- 13CR coupling: Minimum yield strength of 75,000 psi (517 MPa), maximum yield strength of 105,000 psi (724 MPa)

These different strength grades of couplings can adapt to various complex conditions, from shallow to deep wells and from conventional extraction to high-sulfur hydrogen environments.

#### IV. Tianjin Longkai Lai Company's Competitive Pricing Advantage

As a well-known manufacturer of oil country tubular goods, Tianjin Longkai Lai Company leverages its advanced production equipment and efficient production processes to offer competitive pricing. Our pricing advantages are mainly reflected in the following aspects:

1. Large-scale production: The company has a large modern production base that can achieve large-scale production, thereby reducing unit costs.

2. Direct sales: As the manufacturer, we directly engage with customers, eliminating intermediary links to ensure that customers can purchase high-quality products at the most favorable prices.

3. Customized services: We provide customized production services, adjusting product specifications and performance according to specific customer needs while maintaining reasonable prices.

#### V. Special Connection Advantages

Tianjin Longkai Lai Company has extensive experience in the design and manufacturing of special connections. Our couplings are designed with advanced concepts and offer the following advantages:

1. High sealing performance: The coupling design ensures high sealing performance, effectively preventing gas and liquid leakage.

2. High-strength connection: The coupling can withstand higher tensile and compressive forces, ensuring stability under complex working conditions.

3. Corrosion resistance: The coupling is treated with special processes, providing excellent corrosion resistance and extending the service life.

4. Quick installation: The coupling design simplifies the installation process, improves construction efficiency, and reduces construction costs.

#### VI. Application Scenarios

The couplings produced by Tianjin Longkai Lai Company are suitable for a variety of oil and gas extraction environments, including but not limited to:

- Conventional oil and gas field extraction

- Deep and ultra-deep well extraction

- High-sulfur hydrogen (H₂S) and high-carbon dioxide (CO₂) environments

- Offshore oil and gas field extraction

Whether on land or offshore, our couplings provide reliable solutions to ensure the safety and efficiency of the extraction process.

#### VII. Customer Case

Tianjin Longkai Lai Company has established long-term cooperative relationships with many internationally renowned oil companies. For example, a South American oil company used our 13CR couplings for deep well extraction. After years of use, the performance of the couplings has been stable, with no quality issues arising, and has received high praise from the customer.

#### VIII. Conclusion

The couplings produced by Tianjin Longkai Lai Company, with their outstanding performance, diverse specifications, competitive pricing, and advanced design, have become the ideal choice for the oil and gas extraction industry. We are committed to providing customers with high-quality products and excellent services to help them achieve efficient and safe extraction goals.